Planting method for promoting root growth of eucalyptus and effectively improving typhoon resistance

Abstract

The invention discloses a planting method for promoting growth of eucalyptus root systems and effectively improving typhoon resistance. The planting method comprises the following steps: (1) selecting a forest land; (2) forest land cleaning; (3) planting density; (4) digging planting pits; (5) applying a bottom-layer bag-controlled slow-release fertilizer; (6) applying a base fertilizer; (7) field planting; (8) applying a shallow-layer bag-controlled slow-release fertilizer; (9) complementary planting; and (10) topdressing. According to the technology, bag-controlled slow-release fertilizers with different slow-release time are applied in different places, nutrients are continuously supplied to plants under deep root systems and around shallow root systems within a certain time range, volatilization, leaching loss and permeation of nitrogen fertilizers, fixation of phosphate fertilizers and migration loss of potash fertilizers can be reduced to the maximum extent, and the utilization rate of the fertilizers is increased. Meanwhile, through the fertilizer taxis of the eucalyptus root systems, extending growth of deep root systems and shallow root systems is guided, the grabbing and attaching force of the eucalyptus is improved, and therefore the typhoon resistance of the eucalyptus is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of forestry planting and relates to a planting method for promoting the growth of eucalyptus root systems and effectively improving typhoon resistance. Background Art

[0002] Eucalyptus is a common tree with a wide growth environment, drought-resistant and barren, easy to plant, and strong germination ability. The root system of eucalyptus is divided into two categories: deep root system and shallow root system. The shallow root system is relatively shallow, a few centimeters to more than ten centimeters from the ground surface, and has a wide horizontal distribution, approximately within the circumference of the trunk projection. It is mainly responsible for absorbing moisture and high-content nutrients in the soil, such as nitrogen and potassium. The deep root system goes deep downward and grows in the deep soil, mainly responsible for absorbing nutrients with low content and high nutrient density, such as phosphorus and zinc. The deep root system provides stable support for eucalyptus to prevent it from falling under the action of wind or other external forces. However, the root system of eucalyptus is shallowly developed and has poor adaptability to soil. When the soil quality in the planting area is poor, the root system is easily affected, especially in coastal areas. When typhoon natural disasters come, the deep root system cannot provide sufficient support, so eucalyptus is prone to lodging. In general, the root growth of eucalyptus is crucial to its survival and growth, which is not only related to the stability of the tree, but also directly affects its absorption of water and nutrients and overall health. Therefore, a planting method that promotes the root growth of eucalyptus and effectively improves its typhoon resistance has been developed, aiming to improve the wind resistance of eucalyptus through reasonable planting methods and means to adapt to different environmental and climatic conditions, thereby ensuring the planting yield and economic benefits of eucalyptus, while protecting environmental resources, better playing the role of eucalyptus in forestry and ecological construction, and realizing the sustainable development of agriculture and forestry.

[0003] 1. The existing eucalyptus planting technology is:

[0004] (1) Select forest land

[0005] Eucalyptus planting sites should be selected in hills, terraces, plains and low mountain and hilly areas with deep soil, loose soil, good drainage and high fertility. Special attention should be paid to the fact that the growth environment of eucalyptus cannot be lower than -5℃ when selecting forest land. Eucalyptus will be easily damaged by frost if the temperature is too low.

[0006] (2) Forest land clearing

[0007] The forest land must be cleared before planting eucalyptus. It is best to complete the forest clearing from July to September of the previous year, remove the debris from the forest land, and place ant killer as appropriate.

[0008] (3) Planting density

[0009] The suitable density of eucalyptus planting is 110-120 plants / mu, and the spacing between plants and rows is configured in a wide row and narrow plant manner, and the planting holes are arranged at a distance of 2m×3m. This can greatly improve the utilization efficiency of the planting area.

[0010] (4) Foundation pit excavation

[0011] The eucalyptus foundation pit is dug with a diameter of 50cm and a depth of 50cm. The excavated soil is piled next to the planting pit for later use. The pit digging time should be completed before the end of November of the year before afforestation.

[0012] (5) Apply basal fertilizer

[0013] For basal fertilizer application, first select appropriate basal fertilizer according to local soil conditions and climate characteristics, and apply it one month before afforestation, with 500g applied per hole. Spread the basal fertilizer evenly at the bottom of each planting hole, backfill the topsoil to 1 / 3 of the planting pit depth, and mix it thoroughly with the basal fertilizer in the pit. After mixing, backfill the pit with the soil dug out next to the planting pit. The surface of the pit is concave, which is easy to collect water, convenient for future planting, and improves the survival rate.

[0014] (6) Planting method

[0015] Under the condition of ensuring the survival rate of seedlings, it is recommended to raise seedlings on site, plant on site, and use light substrate container seedlings. From February to March every year, after rain or light rain is the most suitable season for afforestation. When planting, first dig a 15cm small pit in the planting pit, place the light substrate eucalyptus container seedling in the center of the planting pit, then straighten and cover the soil. The covering soil should be 2cm higher than the surface of the eucalyptus substrate, compact it around, and finally, cover it with a 2cm thick layer of loose soil. If you encounter dry days, water it in time to set the roots. When planting, be careful not to plant the seedlings on the base fertilizer to prevent the roots of the seedlings from contacting the fertilizer and affecting the survival rate. When planting, pay attention to relaxing the roots and compacting them so that the roots can be closely combined with the soil.

[0016] (7) Replanting

[0017] 5-15 days after planting, check the survival rate and replenish seedlings in time to ensure the survival rate of afforestation that year.

[0018] (8) Topdressing

[0019] The first topdressing should be done one month after the eucalyptus is planted or after the sapling grows to 1 meter in height. Dig a 30cm×20cm×15cm (length×width×depth) trench 40cm away from the sapling, apply 0.25kg of compound fertilizer or special fertilizer for eucalyptus in the trench, and cover with soil. In the second year, topdress once in March-April, apply 0.5kg of compound fertilizer or special fertilizer for eucalyptus to each plant. In the third and fourth years, topdress once each, apply 0.8kg of compound fertilizer or special fertilizer for eucalyptus to each plant to promote the rapid growth of eucalyptus. The fertilization method is the same as the first fertilization, but the fertilization location is not in the same place each time.

[0020] 2. The existing technology has defects and deficiencies: (1) Fertilizer is directly applied to the soil. When it encounters rain, the fertilizer is easily lost, resulting in serious waste and environmental pollution. (2) When fertilizer is directly applied to the soil, phosphorus nutrients are easily fixed by the soil and are not easily absorbed by crops; (3) Topdressing is only applied to the surface soil near the tree, where the shallow root system grows well, and the deep root system is underdeveloped and cannot provide sufficient support. Therefore, when encountering typhoons, eucalyptus trees are prone to lodging. Summary of the invention

[0021] The present invention provides a planting method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance, wherein bag-controlled slow-release fertilizer with a long slow-release time is applied to the bottom of the eucalyptus, and bag-controlled slow-release fertilizer with a short slow-release time is applied around the surface of the eucalyptus. The bag-controlled slow-release fertilizer continuously supplies fertilizer to crops by controlling the decay time of different composite materials. When the eucalyptus needs nutrients for growth, the deep roots of the eucalyptus are guided to extend deeply downward and the shallow roots are extended horizontally around through the nutrient tendency of the eucalyptus root system, thereby improving the gripping force of the eucalyptus, thereby improving the typhoon resistance of the eucalyptus and preventing the eucalyptus from falling.

[0022] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0023] A planting method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance, the technology comprises the following steps:

[0024] (1) Select forest land

[0025] Eucalyptus planting sites are selected in hills, terraces, plains or low mountain and hilly areas with deep soil, loose soil, good drainage and high fertility. It should be noted that when selecting forest land, the growth environment of eucalyptus should not be lower than -5℃. If the temperature is too low, it is easy to be frozen.

[0026] (2) Forest land clearing

[0027] Before planting eucalyptus, the forest land should be cleared. The forest land should be cleared from July to September of the previous year. Debris should be removed and ant mites should be applied.

[0028] (3) Planting density

[0029] The eucalyptus planting density is 110-120 plants / mu, and the spacing between plants and rows is configured in a wide row and narrow plant manner to improve the utilization efficiency of the planting area;

[0030] (4) Planting pit digging

[0031] Dig deep open pits for eucalyptus planting, and pile the excavated soil next to the planting pits for future use. The pit digging time should be completed before the end of November of the year before afforestation;

[0032] (5) Application of slow-release fertilizer in bottom bags

[0033] One month before afforestation, select bagged slow-release fertilizer with a long slow-release time and place it at the bottom of the planting pit, and backfill the bagged slow-release fertilizer with the soil dug out from the planting pit, and backfill the soil to 1 / 3 of the pit. The purpose of applying bagged slow-release fertilizer with a long slow-release time at the bottom is to utilize the tree root system's tendency to attract fertilizer, guide the deep roots of eucalyptus to grow downward for a long time, and improve the tree's fixation and support capabilities;

[0034] (6) Apply basal fertilizer

[0035] For basal fertilizer application, first select appropriate basal fertilizer according to soil conditions and climate characteristics, and apply the basal fertilizer at the same time as the bottom bag controlled slow-release fertilizer. Mix the basal fertilizer and the soil dug out of the pit evenly, and then fill it back to 2 / 3 of the planting pit. Finally, fill the planting pit with the soil dug out beside the planting pit. The surface of the pit is concave, which is easy to collect water, convenient for future planting, and improves the survival rate.

[0036] (7) Eucalyptus planting

[0037] Eucalyptus planting should be done on-site, using light substrate container seedlings. Planting should be done from February to March each year, after rain or on cloudy days. When planting, first dig a hole in the planting pit, place the light substrate eucalyptus container seedlings in the center of the planting pit, then cover with soil and straighten it. The covering soil should be higher than the eucalyptus substrate surface by a suitable distance, compact it around, and then cover it with a layer of loose soil. When planting, be careful not to plant the seedlings on the base fertilizer to prevent the roots of the seedlings from directly contacting the fertilizer and affecting the survival rate. When planting, pay attention to loosening the roots and compacting them so that the roots are closely combined with the soil;

[0038] (8) Shallow bag controlled slow release fertilizer application

[0039] After the eucalyptus is planted, immediately apply the shallow bag-controlled slow-release fertilizer. The shallow bag-controlled slow-release fertilizer should be selected with a shorter slow-release time. Dig a pit in front, behind, left and right of the eucalyptus seedlings, put the bag-controlled slow-release fertilizer with a shorter slow-release time in each pit and cover it with soil. After application, water it in time to root it. The purpose of shallow application of bag-controlled slow-release fertilizer is to use the tree root system's tendency to attract fertilizer, guide the eucalyptus shallow root system to extend and grow around, and assist the deep root system to fix and support the eucalyptus;

[0040] (9) Replanting

[0041] 5-15 days after planting, check the survival rate and replenish seedlings in time to ensure the survival rate of the afforestation that year;

[0042] (10) Top dressing

[0043] After the first year of eucalyptus planting, topdressing is not required. The fertilizer and nutrients needed by eucalyptus are supplied by bagged slow-release fertilizers applied during planting. In the second year, topdressing is done for the first time in March and April. For the first topdressing, a trench is dug in front and behind each young tree. Bagged slow-release fertilizers with a longer slow-release time are applied in each trench and covered with soil to promote the growth of eucalyptus and shallow roots. According to this method, topdressing is done for the second time in March and April of the third year and for the third time in March and April of the fourth year. The fertilization position is not the same as the previous year to strengthen the uniform growth of shallow roots to all sides, effectively improve the ability to resist typhoons, and promote the rapid maturity of eucalyptus.

[0044] Preferably, the planting holes in step (3) are arranged at a distance of 2m×3m.

[0045] Preferably, the planting pit in step (4) has a size of 50 cm×50 cm on the top and 40 cm×40 cm on the bottom, in an inverted trapezoidal shape, and a pit depth of 60 cm.

[0046] Preferably, in step (5), 2 bags of 250 g / bag of bagged controlled-release fertilizer with a slow-release period of 12 months are placed at the bottom of the planting pit, and the bagged controlled-release fertilizer is covered with 20 cm of soil dug out of the planting pit.

[0047] Preferably, the nutrient content of the base fertilizer in step (6) is: 6% nitrogen, phosphorus and potassium, 30% organic matter, and 20 million biological beneficial bacteria per gram.

[0048] Preferably, step (6) is applied one month before afforestation, 500 g per hole, the base fertilizer and soil are mixed evenly, and backfilled to 20 cm from the top of the planting pit.

[0049] Preferably, during planting in step (7), a 15 cm hole is first dug in the planting pit, the light substrate eucalyptus container seedling is placed in the center of the planting pit, and then the soil is straightened and covered. The covering soil should be 2 cm higher than the surface of the eucalyptus substrate, compacted around, and then covered with a 2 cm thick layer of loose soil.

[0050] Preferably, in step (8), 4 bags of bagged controlled-release fertilizer with a sustained-release period of 6 months and 100 g / bag are selected, and a 30 cm×20 cm×10 cm (length×width×depth) trench is dug 20 cm in front, behind, left and right of the eucalyptus seedlings, and 1 bag of bagged controlled-release fertilizer with a sustained-release period of 6 months and 100 g / bag is placed in each trench and covered with soil.

[0051] Preferably, in step (10), after the first year of eucalyptus planting, no topdressing is required, and the fertilizer nutrients required by the eucalyptus are supplied by the bagged slow-release fertilizer applied during planting.

[0052] Preferably, in step (10), the first topdressing is performed in March or April of the second year. A 30 cm×20 cm×10 cm (length×width×depth) trench is dug at 40 cm to the left and 40 cm to the right of each eucalyptus tree. A bag of bagged slow-release fertilizer with a slow-release time of 12 months and a weight of 250 g / bag is placed in each trench and covered with soil to promote the growth of the eucalyptus trees and shallow root systems.

[0053] Preferably, in step (10), the second topdressing is performed in March or April of the third year. A 30 cm × 20 cm × 10 cm (length × width × depth) trench is dug at 40 cm to the left and 40 cm to the right of each eucalyptus tree. A bag of bagged slow-release fertilizer with a slow release time of 12 months and 250 g / bag is placed in each trench and covered with soil to promote the growth of the eucalyptus tree and the shallow root system. The fertilization method is the same as the first fertilization, but the location is different.

[0054] Preferably, in step (10), the third topdressing is performed in March or April of the fourth year. A 30 cm × 20 cm × 10 cm (length × width × depth) trench is dug at 40 cm in front and 40 cm behind each eucalyptus tree. A bag of bagged slow-release fertilizer with a slow-release time of 12 months and 250 g / bag is placed in each trench and covered with soil to promote the growth of the eucalyptus tree and the shallow root system. The fertilization method is the same as the first fertilization and the location is the same.

[0055] Technical principle of the present invention:

[0056] The inner non-woven fabric with soluble and degradable minerals added and the outer kraft paper are combined together through a heat-sealing unit to form a new packaging composite material. The packaging composite material is made into a packaging bag, and fertilizer is put into it to make a bag-controlled slow-release fertilizer. This bag-controlled slow-release fertilizer subverts the previous fertilization method. The fertilizer is wrapped in the packaging composite material to avoid the volatilization, leaching and penetration of nitrogen fertilizer and the migration and loss of potassium fertilizer. At the same time, it prevents the fertilizer from directly contacting the soil and prevents the phosphorus nutrients in the fertilizer from being fixed by some chemical elements in the soil. The outer kraft paper packaging can be made of wood pulp paper, bagasse paper, etc. The material and thickness of the outer kraft paper can control the decay time of the outer composite material, thereby controlling the fertilizer supply time to the eucalyptus. Different proportions of soluble and degradable minerals are added to the non-woven fabric, and through the dissolution of the soluble and degradable minerals, soluble pores with different gaps are formed on the non-woven fabric. Through the density of the soluble pores, the amount of slow-release exudation of fertilizer nutrients under the action of water is controlled to achieve precise supply of crop nutrients. Because the roots of eucalyptus tend to attract fertilizer, bagged slow-release fertilizer with a long slow-release time is buried at the bottom of the eucalyptus. When the deep roots of the eucalyptus need nutrients, the outer packaging of the bagged fertilizer rots, and the nutrients overflow with water. The deep roots of the eucalyptus extend to the deeply buried bagged fertilizer and absorb nutrients. Bagged slow-release fertilizer with a short slow-release time is buried around the shallow layer of the eucalyptus. When the shallow roots of the eucalyptus need nutrients, the outer packaging of the bagged fertilizer rots, and the nutrients overflow with water. The shallow roots of the eucalyptus expand around the shallow soil and absorb nutrients, thereby promoting the growth of the eucalyptus root system and effectively improving the eucalyptus's ability to resist typhoons.

[0057] Compared with the prior art, the present invention has the following technical advantages:

[0058] (1) The biodegradable and environmentally friendly multi-layer mineral material developed by the present invention can slowly control the release of fertilizer nutrients. After technical fertilization, the degradable calcium carbonate can dissolve into different numbers of small pores in acidic soil. Under the action of water, the fertilizer nutrients are slowly released and seeped out through the pores, realizing precise nutrient supply to crops.

[0059] (2) After planting eucalyptus trees, no topdressing is required in the first year, which reduces production costs.

[0060] (3) The fertilizer efficiency is significantly improved. After fertilization, the loss of fertilizer nutrients is reduced by more than 42%. The annual average height increase and annual average breast diameter increase of eucalyptus obtained by the planting method of the present invention are at least 38.77% and 20.19% higher than those obtained by the prior art, respectively. This shows that the eucalyptus planting method of the present invention has significant progress compared with the prior art.

[0061] (4) Precision fertilization effectively solves the problem of poor matching between fertilizer nutrient release and eucalyptus demand, fills the gap in the technical system of crop precision fertilization, and achieves the goal of precise, efficient and environmentally friendly eucalyptus fertilization and fertilizer production.

[0062] (5) It is environmentally friendly. The composite material is biodegradable, with high fertilizer utilization rate and less loss, which reduces the use of chemical fertilizers and protects soil health and crop quality.

[0063] (6) The present invention adopts a new method and technology of using biodegradable paper cloth environmentally friendly composite materials to accurately slow-release and control the release of fertilizer nutrients, thereby solving the key problem of plant nutrition and fertilization by coordinating the release rate of fertilizer nutrients with the nutrients required for plant growth.

[0064] (7) The bag-controlled slow-release fertilizer of the present invention has a multi-layer material that wraps the fertilizer, thereby preventing the volatilization, leaching and penetration of nitrogen fertilizer and the migration and loss of potassium fertilizer. At the same time, it prevents the fertilizer from directly contacting the soil, thereby preventing the phosphorus nutrient in the fertilizer from being fixed by the reaction of some chemical elements in the soil.

[0065] (8) Bury bagged slow-release fertilizer with a long slow-release time at the bottom of the eucalyptus. When the deep roots of the eucalyptus need nutrients, the outer packaging of the bagged fertilizer rots, and the nutrients overflow with water. The deep roots of the eucalyptus will extend to the deeply buried bagged fertilizer and absorb nutrients. Bury bagged slow-release fertilizer with a short slow-release time around the shallow roots of the eucalyptus. When the shallow roots of the eucalyptus need nutrients, the outer packaging of the bagged fertilizer rots, and the nutrients overflow with water. The shallow roots of the eucalyptus will expand around the shallow soil and absorb nutrients, thereby promoting the growth of the eucalyptus root system and effectively improving the eucalyptus's ability to resist typhoons. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 The present invention is a flow chart of a planting method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance.

[0067] Figure 2 This is a schematic diagram of a method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance of the present invention. In the figure, 1-eucalyptus seedling; 2-100g bag controlled slow-release fertilizer; 3-excavated soil covering layer 1; 4-base fertilizer and excavated soil mixed layer; 5-excavated soil covering layer 2; 6-250g bag controlled slow-release fertilizer; 7-original soil layer. DETAILED DESCRIPTION

[0068] To further explain the technical means and effects of the present invention, the technical solution of the present invention is further described below in conjunction with the embodiments of the present invention, but the present invention is not limited to the scope of the embodiments.

[0069] In the embodiment of the present invention, see Figure 1 , 2 A planting method for promoting the root growth of eucalyptus and effectively improving its typhoon resistance comprises the following steps:

[0070] (1) Select forest land

[0071] Eucalyptus planting sites are selected in hills, terraces, plains and low mountain and hilly areas with deep soil, loose soil, good drainage and high fertility. Special attention should be paid to the fact that the growth environment of eucalyptus cannot be lower than -5℃ when selecting forest land. Eucalyptus is easily damaged by frost as the temperature is too low.

[0072] (2) Forest land clearing

[0073] The forest land was cleared before planting eucalyptus trees. The forest land was cleared from July to September of the previous year. Debris was removed and ant killer was applied.

[0074] (3) Planting density

[0075] The eucalyptus planting density is 110-120 plants / mu, and the spacing between plants and rows is configured in a wide row and narrow plant manner, and the planting holes are arranged at a distance of 2m×3m. This can greatly improve the utilization efficiency of the planting area.

[0076] (4) Planting pit digging

[0077] The eucalyptus planting pit is dug with the following specifications: 50cm×50cm on the surface, 40cm×40cm on the bottom, in an inverted trapezoidal shape, and 60cm deep. The excavated soil is piled up next to the planting pit for later use. The pit digging time should be completed before the end of November of the year before afforestation.

[0078] (5) Application of slow-release fertilizer in bottom bags

[0079] Select 2 bags of bagged slow-release fertilizer (250g / bag) with a slow-release period of 12 months and place them at the bottom of the planting pit, and cover the bagged slow-release fertilizer with 20cm of soil dug from the planting pit. The purpose of applying bagged slow-release fertilizer with a long slow-release period at the bottom is to utilize the tree root system's tendency to attract fertilizer, guide the deep roots of eucalyptus to grow downward for a long time, and improve the tree's fixation and support capabilities;

[0080] The method for preparing the bag-controlled slow-release fertilizer comprises the following steps:

[0081] S1: mixing bagasse and wood pulp fiber to form an outer layer of kraft paper, wherein the mass ratio of bagasse paper to wood pulp fiber is (5-9):(3-4);

[0082] S2: Add 20% 800 mesh calcium carbonate during the preparation of the non-woven fabric to produce an inner non-woven fabric material with a long sustained release period;

[0083] S3: The outer layer of kraft paper prepared in S1 and the inner layer of non-woven fabric prepared in S2 are uniformly heat-sealed by a heat-sealing unit at a temperature of 280-320° C. to prepare a bag-wrapped composite material with a sustained-release period of 12 months;

[0084] S4: According to the nutrient ratio of eucalyptus: N-P2O5-K2O, 15-6-9, urea, monoammonium phosphate, potassium chloride, tung bran, zinc sulfate heptahydrate, borax, and iron sulfate are taken in a raw material ratio of 0.3:0.16:0.16:0.345:0.01:0.02:0.005 to prepare a special fertilizer for eucalyptus;

[0085] S5: The eucalyptus fertilizer prepared in step S4 is packaged with the bag-wrapped composite material with a long sustained-release period prepared in step S3 to prepare eucalyptus bag-controlled slow-release fertilizer with a sustained-release period of 12 months and 250 g / bag.

[0086] (6) Apply basal fertilizer

[0087] For basal fertilizer application, first select appropriate basal fertilizer according to local soil conditions and climate characteristics. The nutrient content of basal fertilizer is: 6% nitrogen, phosphorus and potassium, 30% organic matter, and 20 million biological beneficial bacteria per gram. Apply it together with the bottom bag-controlled slow-release fertilizer one month before afforestation. Apply 500g per hole. The specific method is: mix 500g of basal fertilizer and soil into a compound state, evenly spread 20cm on the topsoil of the bag-controlled slow-release fertilizer in each planting pit, and then fill the pit with the soil dug out next to the planting pit. The surface of the pit is concave, which is easy to collect water, convenient for future planting, and improves the survival rate.

[0088] (7) Eucalyptus planting

[0089] Eucalyptus planting should be done on-site by raising seedlings and planting on-site. Use light substrate container seedlings. Planting should be done from February to March each year, after rain or on cloudy days. When planting, first dig a 15cm small pit in the planting pit, place the light substrate eucalyptus container seedling in the center of the planting pit, then straighten and cover with soil. The soil should be 2cm higher than the surface of the eucalyptus substrate, compact it around, and then cover it with a 2cm thick layer of loose soil. When planting, be careful not to plant the seedlings on the base fertilizer to prevent the roots of the seedlings from directly contacting the fertilizer and affecting the survival rate. When planting, pay attention to loosening the roots and compacting them so that the roots are closely combined with the soil.

[0090] (8) Shallow bag controlled slow release fertilizer application

[0091] After the eucalyptus is planted, immediately apply the shallow bag-controlled slow-release fertilizer. For the shallow bag-controlled slow-release fertilizer, use 4 bags of bag-controlled slow-release fertilizer with a slow-release time of 6 months (100g / bag). Dig a 30cm×20cm×10cm (length×width×depth) trench 20cm in front, behind, left and right of the eucalyptus seedlings in the horizontal direction. Put 1 bag of bag-controlled slow-release fertilizer with a slow-release time of 6 months (100g / bag) in each trench and cover it with soil. After application, water it in time to fix the roots. The purpose of shallow application of bag-controlled slow-release fertilizer is to use the tree root system's tendency to attract fertilizer to guide the shallow roots of eucalyptus to extend and grow around the shallow soil layer, and to assist the deep roots to fix and support the eucalyptus.

[0092] The method for preparing the bag-controlled slow-release fertilizer comprises the following steps:

[0093] S1: Bagasse and wood pulp fiber are mixed to form an outer layer of kraft paper, wherein the mass ratio of the wood pulp paper to the bagasse paper is (2-5):(1-2).

[0094] S2: 40% 1200 mesh calcium carbonate was added to the non-woven fabric to obtain an inner non-woven fabric material with a short sustained release period.

[0095] S3: The outer layer of kraft paper made by S1 and the inner layer of non-woven fabric material made by S2 are uniformly heat-sealed by a heat-sealing unit at a temperature of 280-320° C. to produce a bag wrapping layer material with a sustained release period of 6 months.

[0096] S4: According to the nutrient ratio of eucalyptus: N-P2O5-K2O, 15-6-9, urea, monoammonium phosphate, potassium chloride, tung bran, zinc sulfate heptahydrate, borax, and iron sulfate are taken in a raw material ratio of 0.3:0.16:0.16:0.345:0.01:0.02:0.005 to prepare a special fertilizer for eucalyptus;

[0097] S5: The eucalyptus fertilizer prepared in step S4 is packaged with the bag-wrapped composite material with a short sustained-release period prepared in step S3 to prepare eucalyptus bag-controlled slow-release fertilizer with a sustained-release period of 6 months and a weight of 100 g / bag.

[0098] (9) Replanting

[0099] Check the survival rate within 5-15 days after planting and replenish seedlings in time to ensure the survival rate of afforestation that year.

[0100] (10) Top dressing

[0101] After the first year of eucalyptus planting, no topdressing is required. The fertilizer nutrients required by eucalyptus are supplied by the bagged slow-release fertilizer applied during planting. In the second year, the first topdressing is carried out in March-April. For the first topdressing, a 30cm×20cm×15cm (length×width×depth) trench is dug at 40cm in front and 40cm behind each eucalyptus tree. One bag (250g / bag) of bagged slow-release fertilizer with a slow-release period of 12 months (the same as the preparation method of bagged slow-release fertilizer described in step (5)) is applied in each trench and covered with soil. According to this method, the second topdressing is performed in March and April of the third year. For the second topdressing, a 30cm×20cm×15cm (length×width×depth) groove is dug at 40cm to the left and right of each eucalyptus tree. One bag (250g / bag) of bagged slow-release fertilizer with a slow-release period of 12 months (consistent with the preparation method of bagged slow-release fertilizer described in step (5)) is applied in each groove and covered with soil. The third topdressing is performed in March and April of the fourth year. For the third topdressing, a 30cm×20cm×15cm (length×width×depth) groove is dug at 40cm in front and behind each eucalyptus tree. One bag (250g / bag) of bagged slow-release fertilizer with a slow-release period of 12 months (consistent with the preparation method of bagged slow-release fertilizer described in step (5)) is applied in each groove and covered with soil. The fertilization location is different from the previous year's location, so as to strengthen the uniform growth of shallow roots in all directions, effectively improve the ability to resist typhoons, and promote the rapid growth of eucalyptus.

[0102] The technical principle of the bag-controlled slow-release fertilizer preparation of the present invention is as follows:

[0103] The preparation of bag-controlled slow-release fertilizer mainly includes three core parts: the first is the production of the outer layer of kraft paper, the second is the production of the inner layer of non-woven fabric, the third is the preparation of the bag-wrapped composite material, and the fourth is the production of eucalyptus-specific fertilizer. The outer layer composite material technology controls the dissolution rate of fertilizer and the nutrient release rate through the barrier of the outer packaging material, the degree of decay of the outer layer of kraft paper, and the proportion of calcium carbonate added to the inner layer of non-woven fabric, thereby achieving slow release of fertilizer effect, further extending the fertilizer effect period, and preventing fertilizer loss.

[0104] (I) Details

[0105] 1. Preparation of outer kraft paper (step S1)

[0106] Bagasse and wood pulp fiber are made into outer kraft paper, wherein the mass ratio of bagasse paper and wood pulp fiber is (5-9):(3-4) or (2-5):(1-2), and then the outer kraft paper of different specifications is made through papermaking process to adapt to the use of fertilizers with different slow-release periods. The mixed use of optimized and selected bagasse and wood pulp fiber can control the degradation time of the outer kraft paper, ensure the strength, toughness and corrosion resistance of the outer material, and reduce the cost.

[0107] 2. Preparation of inner layer material (step S2)

[0108] In the preparation process of non-woven fabrics, 20% 800-mesh calcium carbonate or 40% 1200-mesh calcium carbonate is added to the non-woven fabric material, and non-woven fabrics of different specifications are made through the non-woven fabric production process to adapt to the use of fertilizers with different slow-release periods. Calcium carbonate of different meshes can be dissolved into small holes with different gaps and numbers under the action of acidic soil. The amount of calcium carbonate added is optimized and screened, and needs to be strictly controlled. First, it ensures that the inner layer material has good physical properties; second, it can control the degradation time of the non-woven fabric and the nutrient release rate.

[0109] 3. Preparation of bag covering layer material (step S3)

[0110] The outer layer of kraft paper made from S1 and the inner layer of non-woven fabric made from S2 are uniformly heat-sealed by a heat-sealing unit at a temperature of 280-320°C to form a bag-wrapped composite material. The selection of the heat-sealing temperature should take into account the melting point and thermal stability of the material to ensure the heat-sealing quality and material performance.

[0111] 4. Preparation of special fertilizer for eucalyptus (step S4)

[0112] According to the nutrient ratio of eucalyptus: N-P2O5-K2O, 15-6-9, urea, monoammonium phosphate, potassium chloride, tung bran, zinc sulfate heptahydrate, borax, and iron sulfate are taken in a raw material ratio of 0.3:0.16:0.16:0.345:0.01:0.02:0.005 to prepare a special fertilizer for eucalyptus;

[0113] 5. Preparation of eucalyptus bag controlled slow-release fertilizer (step S5)

[0114] The eucalyptus fertilizer prepared in step S4 is packaged with the bag-wrapped layer material with different slow-release periods prepared in step S3 to prepare eucalyptus bag-controlled slow-release fertilizers with different slow-release periods.

[0115] A. Fertilizer components and their functions

[0116] 1) Urea (0.3 parts): As the main nitrogen source, urea can provide eucalyptus with the necessary nitrogen, promote leaf growth and photosynthesis, and thus increase biomass.

[0117] 2) Monoammonium phosphate (0.16 parts): Provides phosphorus, which is an important component of plant cell walls and nucleic acids and is essential for root development and energy metabolism.

[0118] 3) Potassium chloride (0.16 parts): provides potassium, which has a significant effect on plant stress resistance, fruit quality and yield.

[0119] 4) Tung bran (0.345 parts): rich in organic matter and various trace elements, it can improve the soil environment and increase soil fertility.

[0120] 5) Zinc sulfate heptahydrate (0.01 parts): It is an inorganic compound that is soluble in water and can kill bacteria. It is used to protect crops from fungi and bacteria and improve crop yield and quality.

[0121] 6) Borax (0.02 parts): provides the element boron, which has an effect on the growth and elongation of crop roots and can enhance the stress resistance of crops.

[0122] 7) Ferrous sulfate (0.005 parts): Supplements iron, which plays an important role in plant growth and development and can also control the pH value of the soil.

[0123] B. The necessity of controlling dosage

[0124] Fertilizer dosage control is crucial to improving fertilizer efficiency and promoting eucalyptus growth. Excessive use of nitrogen fertilizer may cause eucalyptus to grow too fast, but the quality will decline, and the risk of pests and diseases will increase; excessive use of phosphorus fertilizer and potassium fertilizer may also cause soil compaction and salinization, affecting the normal growth of plants. Therefore, reasonable control of the dosage of each fertilizer component can not only ensure the normal growth and development of eucalyptus, but also avoid fertilizer waste and environmental pollution.

[0125] C. Technical Principle

[0126] This fertilizer formula is based on the growth needs and soil environment of eucalyptus, and achieves balanced nutrition supply by scientifically proportioning the various fertilizer components. The addition of tung bran can improve the soil environment, increase soil fertility and water and fertilizer retention capacity, and further promote the growth and development of eucalyptus. In addition, by precisely controlling the dosage of each fertilizer component, the negative effects caused by excessive use can be avoided, and the fertilizer effect can be maximized.

[0127] In summary, this fertilizer formula has significant advantages in increasing the growth of eucalyptus and promoting its growth. By scientifically proportioning the fertilizer components and accurately controlling the dosage, it can achieve balanced nutrient supply and improve the soil environment, providing a strong guarantee for the healthy growth and yield increase of eucalyptus.

[0128] 2. Conclusion

[0129] The preparation technology of bag-controlled slow-release fertilizer involves multiple steps and parameter control. By accurately controlling the formula and process parameters of each step, bag-controlled slow-release fertilizer with excellent performance can be prepared. This fertilizer has the advantages of long-lasting fertilizer effect, slow nutrient release, reduced nutrient loss and environmental pollution, and has broad application prospects in modern agricultural production.

[0130] In order to make the disclosure of the present invention more complete, it is described below through more specific embodiments.

[0131] Example 1

[0132] A planting method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance, comprising the following steps:

[0133] (1) Select forest land

[0134] Eucalyptus planting sites are selected in hilly areas with deep soil, loose soil, good drainage and high fertility. The environment should not be lower than -5℃. If the temperature is too low, it is easy to suffer from frost damage.

[0135] (2) Forest land clearing

[0136] The forest land was cleared before planting eucalyptus trees. The forest clearing was completed in July of the previous year, and the debris in the forest was removed and ant killer was placed.

[0137] (3) Planting density

[0138] The eucalyptus planting density is 110 plants / mu, and the spacing between plants and rows is configured in a wide row and narrow plant manner, and the planting holes are arranged at a distance of 2m×3m, which can greatly improve the utilization efficiency of the planting area.

[0139] (4) Planting pit digging

[0140] The eucalyptus planting pit is dug with the following specifications: 50cm×50cm on the surface, 40cm×40cm on the bottom, in an inverted trapezoidal shape, and 60cm deep. The excavated soil is piled up next to the planting pit for later use. The pit digging time should be completed before the end of November of the year before afforestation.

[0141] (5) Application of slow-release fertilizer in bottom bags

[0142] Select 2 bags of bagged slow-release fertilizer (250g / bag) with a slow-release period of 12 months and place them at the bottom of the planting pit, and cover the bagged slow-release fertilizer with 20cm of soil dug from the planting pit. The purpose of applying bagged slow-release fertilizer with a long slow-release period at the bottom is to utilize the tree root system's tendency to attract fertilizer, guide the deep roots of eucalyptus to grow downward for a long time, and improve the tree's fixation and support capabilities;

[0143] The method for preparing the bag-controlled slow-release fertilizer comprises the following steps:

[0144] S1: mixing bagasse and wood pulp fiber to form an outer layer of kraft paper, wherein the mass ratio of bagasse paper to wood pulp fiber is 7:3;

[0145] S2: Add 20% 800 mesh calcium carbonate during the preparation of the non-woven fabric to produce an inner non-woven fabric material with a long sustained release period;

[0146] S3: The outer layer of kraft paper prepared in S1 and the inner layer of non-woven fabric prepared in S2 are uniformly heat-sealed by a heat-sealing unit at a temperature of 286°C to prepare a bag-wrapped composite material with a sustained-release period of 12 months;

[0147] S4: According to the nutrient ratio of eucalyptus: N-P2O5-K2O, 15-6-9, urea, monoammonium phosphate, potassium chloride, tung bran, zinc sulfate heptahydrate, borax, and iron sulfate are taken in a raw material ratio of 0.3:0.16:0.16:0.345:0.01:0.02:0.005 to prepare a special fertilizer for eucalyptus;

[0148] S5: The eucalyptus fertilizer prepared in step S4 is packaged with the bag-wrapped composite material with a long sustained-release period prepared in step S3 to prepare eucalyptus bag-controlled slow-release fertilizer with a sustained-release period of 12 months and 250 g / bag.

[0149] (6) Apply basal fertilizer

[0150] For basal fertilizer application, first select appropriate basal fertilizer according to local soil conditions and climate characteristics. The nutrient content of basal fertilizer is: 6% nitrogen, phosphorus and potassium, 30% organic matter, and 20 million biological beneficial bacteria per gram. Apply it together with the bottom bag-controlled slow-release fertilizer one month before afforestation. Apply 500g per hole. The specific method is: mix 500g of basal fertilizer and soil into a compound state, evenly spread 20cm on the topsoil of the bag-controlled slow-release fertilizer in each planting pit, and then fill the pit with the soil dug out next to the planting pit. The surface of the pit is concave, which is easy to collect water, convenient for future planting, and improves the survival rate.

[0151] (7) Eucalyptus planting

[0152] Eucalyptus planting should be done on-site, using light substrate container seedlings. Planting should be done on a cloudy day in February each year. When planting, first dig a 15cm small pit in the planting pit, place the light substrate eucalyptus container seedlings in the center of the planting pit, then straighten and cover with soil. The soil should be 2cm higher than the eucalyptus substrate surface, compact it around, and then cover it with a 2cm thick layer of loose soil. When planting, be careful not to plant the seedlings on the base fertilizer to prevent the roots of the seedlings from directly contacting the fertilizer and affecting the survival rate. When planting, pay attention to loosening the roots and compacting them so that the roots are closely combined with the soil.

[0153] (8) Shallow bag controlled slow release fertilizer application

[0154] After the eucalyptus is planted, immediately apply the shallow bag-controlled slow-release fertilizer. For the shallow bag-controlled slow-release fertilizer, use 4 bags of bag-controlled slow-release fertilizer with a slow-release time of 6 months (100g / bag). Dig a 30cm×20cm×10cm (length×width×depth) trench 20cm in front, behind, left and right of the eucalyptus seedlings in the horizontal direction. Put 1 bag of bag-controlled slow-release fertilizer with a slow-release time of 6 months (100g / bag) in each trench and cover it with soil. After application, water it in time to fix the roots. The purpose of shallow application of bag-controlled slow-release fertilizer is to use the tree root system's tendency to attract fertilizer to guide the shallow roots of eucalyptus to extend and grow around the shallow soil layer, and to assist the deep roots to fix and support the eucalyptus.

[0155] The method for preparing the bag-controlled slow-release fertilizer comprises the following steps:

[0156] S1: Bagasse and wood pulp fiber are mixed to form an outer layer of kraft paper, wherein the mass ratio of the wood pulp paper to the bagasse paper is 2:1.

[0157] S2: 40% 1200 mesh calcium carbonate was added to the non-woven fabric to obtain an inner non-woven fabric material with a short sustained release period.

[0158] S3: The outer layer of kraft paper made from S1 and the inner layer of non-woven fabric material made from S2 are uniformly heat-sealed by a heat-sealing unit at a temperature of 290° C. to produce a bag wrapping layer material with a sustained release period of 6 months.

[0159] S4: According to the nutrient ratio of eucalyptus: N-P2O5-K2O, 15-6-9, urea, monoammonium phosphate, potassium chloride, tung bran, zinc sulfate heptahydrate, borax, and iron sulfate are taken in a raw material ratio of 0.3:0.16:0.16:0.345:0.01:0.02:0.005 to prepare a special fertilizer for eucalyptus;

[0160] S5: The eucalyptus fertilizer prepared in step S4 is packaged with the bag-wrapped composite material with a short sustained-release period prepared in step S3 to prepare eucalyptus bag-controlled slow-release fertilizer with a sustained-release period of 6 months and a weight of 100 g / bag.

[0161] (9) Replanting

[0162] Check the survival rate within 6 days after planting and replenish seedlings in time to ensure the survival rate of afforestation that year.

[0163] (10) Top dressing

[0164] After the first year of eucalyptus planting, no topdressing is required. The fertilizer nutrients required by eucalyptus are supplied by the bagged slow-release fertilizer applied during planting. In the second year, the first topdressing is carried out in March. For the first topdressing, a 30cm×20cm×15cm (length×width×depth) trench is dug at 40cm in front and 40cm behind each eucalyptus tree. One bag (250g / bag) of bagged slow-release fertilizer with a slow-release period of 12 months (the same as the preparation method of bagged slow-release fertilizer described in step (5)) is applied in each trench and covered with soil. According to this method, in March of the third year, the second topdressing is performed. For the second topdressing, a 30cm×20cm×15cm (length×width×depth) groove is dug at 40cm to the left and right of each eucalyptus tree. One package (250g / bag) of bagged slow-release fertilizer with a slow-release period of 12 months (consistent with the preparation method of bagged slow-release fertilizer described in step (5)) is applied in each groove and covered with soil. In March of the fourth year, the third topdressing is performed. For the third topdressing, a 30cm×20cm×15cm (length×width×depth) groove is dug at 40cm in front and back of each eucalyptus tree. One package (250g / bag) of bagged slow-release fertilizer with a slow-release period of 12 months (consistent with the preparation method of bagged slow-release fertilizer described in step (5)) is applied in each groove and covered with soil. The fertilization position is not the same as the position of the previous year, so as to strengthen the uniform growth of shallow roots to all sides, effectively improve the typhoon resistance, and promote the rapid maturity of eucalyptus.

[0165] Example 2

[0166] A planting method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance, comprising the following steps:

[0167] (1) Select forest land

[0168] Eucalyptus planting sites are selected in low mountain and hilly areas with deep soil, loose soil, good drainage and high fertility. The environment should not be lower than -5℃. If the temperature is too low, it is easy to suffer from frost damage.

[0169] (2) Forest land clearing

[0170] The forest land was cleared before planting eucalyptus trees. The forest clearing was completed in August of the previous year, and the debris in the forest was removed and ant killer was placed.

[0171] (3) Planting density

[0172] The eucalyptus planting density is 110 plants / mu, and the spacing between plants and rows is configured in a wide row and narrow plant manner, and the planting holes are arranged at a distance of 2m×3m, which can greatly improve the utilization efficiency of the planting area.

[0173] (4) Planting pit digging

[0174] The eucalyptus planting pit is dug with the following specifications: 50cm×50cm on the surface, 40cm×40cm on the bottom, in an inverted trapezoidal shape, and 60cm deep. The excavated soil is piled up next to the planting pit for later use. The pit digging time should be completed before the end of November of the year before afforestation.

[0175] (5) Application of slow-release fertilizer in bottom bags

[0176] Select 2 bags of bagged slow-release fertilizer (250g / bag) with a slow-release period of 12 months and place them at the bottom of the planting pit, and cover the bagged slow-release fertilizer with 20cm of soil dug from the planting pit. The purpose of applying bagged slow-release fertilizer with a long slow-release period at the bottom is to utilize the tree root system's tendency to attract fertilizer, guide the deep roots of eucalyptus to grow downward for a long time, and improve the tree's fixation and support capabilities;

[0177] The method for preparing the bag-controlled slow-release fertilizer comprises the following steps:

[0178] S1: mixing bagasse and wood pulp fiber to form an outer layer of kraft paper, wherein the mass ratio of bagasse paper to wood pulp fiber is 8:3.7;

[0179] S2: Add 20% 800 mesh calcium carbonate during the preparation of the non-woven fabric to produce an inner non-woven fabric material with a long sustained release period;

[0180] S3: The outer layer of kraft paper prepared in S1 and the inner layer of non-woven fabric prepared in S2 are uniformly heat-sealed by a heat-sealing unit at a temperature of 300°C to prepare a bag-wrapped composite material with a sustained-release period of 12 months;

[0181] S4: According to the nutrient ratio of eucalyptus: N-P2O5-K2O, 15-6-9, urea, monoammonium phosphate, potassium chloride, tung bran, zinc sulfate heptahydrate, borax, and iron sulfate are taken in a raw material ratio of 0.3:0.16:0.16:0.345:0.01:0.02:0.005 to prepare a special fertilizer for eucalyptus;

[0182] S5: The eucalyptus fertilizer prepared in step S4 is packaged with the bag-wrapped composite material with a long sustained-release period prepared in step S3 to prepare eucalyptus bag-controlled slow-release fertilizer with a sustained-release period of 12 months and 250 g / bag.

[0183] (6) Apply basal fertilizer

[0184] For basal fertilizer application, first select appropriate basal fertilizer according to local soil conditions and climate characteristics. The nutrient content of basal fertilizer is: 6% nitrogen, phosphorus and potassium, 30% organic matter, and 20 million biological beneficial bacteria per gram. Apply it together with the bottom bag-controlled slow-release fertilizer one month before afforestation. Apply 500g per hole. The specific method is: mix 500g of basal fertilizer and soil into a compound state, evenly spread 20cm on the topsoil of the bag-controlled slow-release fertilizer in each planting pit, and then fill the pit with the soil dug out next to the planting pit. The surface of the pit is concave, which is easy to collect water, convenient for future planting, and improves the survival rate.

[0185] (7) Eucalyptus planting

[0186] Eucalyptus planting should be done on-site by raising seedlings and planting on-site. Use light substrate container seedlings. Planting should be done in March every year after the rain. When planting, first dig a 15cm small pit in the planting pit, place the light substrate eucalyptus container seedling in the center of the planting pit, then straighten and cover with soil. The soil should be 2cm higher than the surface of the eucalyptus substrate, compact it around, and then cover it with a 2cm thick layer of loose soil. When planting, be careful not to plant the seedlings on the base fertilizer to prevent the roots of the seedlings from directly contacting the fertilizer and affecting the survival rate. When planting, pay attention to relaxing the roots and compacting them so that the roots are closely combined with the soil.

[0187] (8) Shallow bag controlled slow release fertilizer application

[0188] After the eucalyptus is planted, immediately apply the shallow bag-controlled slow-release fertilizer. For the shallow bag-controlled slow-release fertilizer, use 4 bags of bag-controlled slow-release fertilizer with a slow-release time of 6 months (100g / bag). Dig a 30cm×20cm×10cm (length×width×depth) trench 20cm in front, behind, left and right of the eucalyptus seedlings in the horizontal direction. Put 1 bag of bag-controlled slow-release fertilizer with a slow-release time of 6 months (100g / bag) in each trench and cover it with soil. After application, water it in time to fix the roots. The purpose of shallow application of bag-controlled slow-release fertilizer is to use the tree root system's tendency to attract fertilizer to guide the shallow roots of eucalyptus to extend and grow around the shallow soil layer, and to assist the deep roots to fix and support the eucalyptus.

[0189] The method for preparing the bag-controlled slow-release fertilizer comprises the following steps:

[0190] S1: Bagasse and wood pulp fiber are mixed to form an outer layer of kraft paper, wherein the mass ratio of the wood pulp paper to the bagasse paper is 4:1.3.

[0191] S2: 40% 1200 mesh calcium carbonate was added to the non-woven fabric to obtain an inner non-woven fabric material with a short sustained release period.

[0192] S3: The outer layer of kraft paper made from S1 and the inner layer of non-woven fabric material made from S2 are uniformly heat-sealed by a heat-sealing unit at a temperature of 305° C. to produce a bag wrapping layer material with a sustained release period of 6 months.

[0193] S4: According to the nutrient ratio of eucalyptus: N-P2O5-K2O, 15-6-9, urea, monoammonium phosphate, potassium chloride, tung bran, zinc sulfate heptahydrate, borax, and iron sulfate are taken in a raw material ratio of 0.3:0.16:0.16:0.345:0.01:0.02:0.005 to prepare a special fertilizer for eucalyptus;

[0194] S5: The eucalyptus fertilizer prepared in step S4 is packaged with the bag-wrapped composite material with a short sustained-release period prepared in step S3 to prepare eucalyptus bag-controlled slow-release fertilizer with a sustained-release period of 6 months and a weight of 100 g / bag.

[0195] (9) Replanting

[0196] Check the survival rate within 8 days after planting and replenish seedlings in time to ensure the survival rate of afforestation that year.

[0197] (10) Top dressing

[0198] After the first year of eucalyptus planting, no topdressing is required. The fertilizer nutrients required by eucalyptus are supplied by the bagged slow-release fertilizer applied during planting. In the second year, the first topdressing is carried out in April. For the first topdressing, a 30cm×20cm×15cm (length×width×depth) trench is dug at 40cm in front and 40cm behind each eucalyptus tree. One bag (250g / bag) of bagged slow-release fertilizer with a slow-release period of 12 months (the same as the preparation method of bagged slow-release fertilizer described in step (5)) is applied in each trench and covered with soil. According to this method, in April of the third year, the second topdressing is performed. For the second topdressing, a 30cm×20cm×15cm (length×width×depth) groove is dug at 40cm to the left and right of each eucalyptus tree. One package (250g / bag) of bagged slow-release fertilizer with a slow-release period of 12 months (consistent with the preparation method of bagged slow-release fertilizer described in step (5)) is applied in each groove and covered with soil. In April of the fourth year, the third topdressing is performed. For the third topdressing, a 30cm×20cm×15cm (length×width×depth) groove is dug at 40cm in front and back of each eucalyptus tree. One package (250g / bag) of bagged slow-release fertilizer with a slow-release period of 12 months (consistent with the preparation method of bagged slow-release fertilizer described in step (5)) is applied in each groove and covered with soil. The fertilization position is not the position of the previous year, so as to strengthen the uniform growth of shallow roots to all sides, effectively improve the typhoon resistance, and promote the rapid maturity of eucalyptus.

[0199] Example 3

[0200] A planting method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance, comprising the following steps:

[0201] (1) Select forest land

[0202] Eucalyptus planting sites are selected in hilly areas with deep soil, loose soil, good drainage and high fertility. The environment should not be lower than -5℃. If the temperature is too low, it is easy to suffer from frost damage.

[0203] (2) Forest land clearing

[0204] The forest land was cleared before planting eucalyptus trees. The forest clearing was completed in September of the previous year, and the debris in the forest was removed and ant killer was placed.

[0205] (3) Planting density

[0206] The eucalyptus planting density is 120 plants / mu, and the spacing between plants and rows is configured in a wide row and narrow plant manner, and the planting holes are arranged at a distance of 2m×3m, which can greatly improve the utilization efficiency of the planting area.

[0207] (4) Planting pit digging

[0208] The eucalyptus planting pit is dug with the following specifications: 50cm×50cm on the surface, 40cm×40cm on the bottom, in an inverted trapezoidal shape, and 60cm deep. The excavated soil is piled up next to the planting pit for later use. The pit digging time should be completed before the end of November of the year before afforestation.

[0209] (5) Application of slow-release fertilizer in bottom bags

[0210] Select 2 bags of bagged slow-release fertilizer (250g / bag) with a slow-release period of 12 months and place them at the bottom of the planting pit, and cover the bagged slow-release fertilizer with 20cm of soil dug from the planting pit. The purpose of applying bagged slow-release fertilizer with a long slow-release period at the bottom is to utilize the tree root system's tendency to attract fertilizer, guide the deep roots of eucalyptus to grow downward for a long time, and improve the tree's fixation and support capabilities;

[0211] The method for preparing the bag-controlled slow-release fertilizer comprises the following steps:

[0212] S1: mixing bagasse and wood pulp fiber to form an outer layer of kraft paper, wherein the mass ratio of bagasse paper to wood pulp fiber is 6:3.5;

[0213] S2: Add 20% 800 mesh calcium carbonate during the preparation of the non-woven fabric to produce an inner non-woven fabric material with a long sustained release period;

[0214] S3: The outer layer of kraft paper prepared in S1 and the inner layer of non-woven fabric prepared in S2 are uniformly heat-sealed by a heat-sealing unit at a temperature of 312°C to prepare a bag-wrapped composite material with a sustained-release period of 12 months;

[0215] S4: According to the nutrient ratio of eucalyptus: N-P2O5-K2O, 15-6-9, urea, monoammonium phosphate, potassium chloride, tung bran, zinc sulfate heptahydrate, borax, and iron sulfate are taken in a raw material ratio of 0.3:0.16:0.16:0.345:0.01:0.02:0.005 to prepare a special fertilizer for eucalyptus;

[0216] S5: The eucalyptus fertilizer prepared in step S4 is packaged with the bag-wrapped composite material with a long sustained-release period prepared in step S3 to prepare eucalyptus bag-controlled slow-release fertilizer with a sustained-release period of 12 months and 250 g / bag.

[0217] (6) Apply basal fertilizer

[0218] For basal fertilizer application, first select appropriate basal fertilizer according to local soil conditions and climate characteristics. The nutrient content of basal fertilizer is: 6% nitrogen, phosphorus and potassium, 30% organic matter, and 20 million biological beneficial bacteria per gram. Apply it together with the bottom bag-controlled slow-release fertilizer one month before afforestation. Apply 500g per hole. The specific method is: mix 500g of basal fertilizer and soil into a compound state, evenly spread 20cm on the topsoil of the bag-controlled slow-release fertilizer in each planting pit, and then fill the pit with the soil dug out next to the planting pit. The surface of the pit is concave, which is easy to collect water, convenient for future planting, and improves the survival rate.

[0219] (7) Eucalyptus planting

[0220] Eucalyptus planting should be done on-site, using light substrate container seedlings. Planting should be done in February each year on a cloudy day. When planting, first dig a 15cm small pit in the planting pit, place the light substrate eucalyptus container seedlings in the center of the planting pit, then straighten and cover with soil. The soil should be 2cm higher than the eucalyptus substrate surface, compact it around, and then cover it with a 2cm thick layer of loose soil. When planting, be careful not to plant the seedlings on the base fertilizer to prevent the roots of the seedlings from directly contacting the fertilizer and affecting the survival rate. When planting, pay attention to relaxing the roots and compacting them so that the roots are closely combined with the soil.

[0221] (8) Shallow bag controlled slow release fertilizer application

[0222] After the eucalyptus is planted, immediately apply the shallow bag-controlled slow-release fertilizer. For the shallow bag-controlled slow-release fertilizer, use 4 bags of bag-controlled slow-release fertilizer with a slow-release time of 6 months (100g / bag). Dig a 30cm×20cm×10cm (length×width×depth) trench 20cm in front, behind, left and right of the eucalyptus seedlings in the horizontal direction. Put 1 bag of bag-controlled slow-release fertilizer with a slow-release time of 6 months (100g / bag) in each trench and cover it with soil. After application, water it in time to fix the roots. The purpose of shallow application of bag-controlled slow-release fertilizer is to use the tree root system's tendency to attract fertilizer to guide the shallow roots of eucalyptus to extend and grow around the shallow soil layer, and to assist the deep roots to fix and support the eucalyptus.

[0223] The method for preparing the bag-controlled slow-release fertilizer comprises the following steps:

[0224] S1: Bagasse and wood pulp fiber are mixed to form an outer layer of kraft paper, wherein the mass ratio of the wood pulp paper to the bagasse paper is 3:1.4.

[0225] S2: 40% 1200 mesh calcium carbonate was added to the non-woven fabric to obtain an inner non-woven fabric material with a short sustained release period.

[0226] S3: The outer layer of kraft paper made from S1 and the inner layer of non-woven fabric material made from S2 are uniformly heat-sealed by a heat-sealing unit at a temperature of 308° C. to produce a bag wrapping layer material with a sustained release period of 6 months.

[0227] S4: According to the nutrient ratio of eucalyptus: N-P2O5-K2O, 15-6-9, urea, monoammonium phosphate, potassium chloride, tung bran, zinc sulfate heptahydrate, borax, and iron sulfate are taken in a raw material ratio of 0.3:0.16:0.16:0.345:0.01:0.02:0.005 to prepare a special fertilizer for eucalyptus;

[0228] S5: The eucalyptus fertilizer prepared in step S4 is packaged with the bag-wrapped composite material with a short sustained-release period prepared in step S3 to prepare eucalyptus bag-controlled slow-release fertilizer with a sustained-release period of 6 months and a weight of 100 g / bag.

[0229] (9) Replanting

[0230] Check the survival rate within 12 days after planting and replenish seedlings in time to ensure the survival rate of afforestation that year.

[0231] (10) Top dressing

[0232] After the first year of eucalyptus planting, no topdressing is required. The fertilizer nutrients required by eucalyptus are supplied by the bagged slow-release fertilizer applied during planting. In the second year, the first topdressing is carried out in March. For the first topdressing, a 30cm×20cm×15cm (length×width×depth) trench is dug at 40cm in front and 40cm behind each eucalyptus tree. One bag (250g / bag) of bagged slow-release fertilizer with a slow-release period of 12 months (the same as the preparation method of bagged slow-release fertilizer described in step (5)) is applied in each trench and covered with soil. According to this method, in March of the third year, the second topdressing is performed. For the second topdressing, a 30cm×20cm×15cm (length×width×depth) groove is dug at 40cm to the left and right of each eucalyptus tree. One package (250g / bag) of bagged slow-release fertilizer with a slow-release period of 12 months (consistent with the preparation method of bagged slow-release fertilizer described in step (5)) is applied in each groove and covered with soil. In March of the fourth year, the third topdressing is performed. For the third topdressing, a 30cm×20cm×15cm (length×width×depth) groove is dug at 40cm in front and back of each eucalyptus tree. One package (250g / bag) of bagged slow-release fertilizer with a slow-release period of 12 months (consistent with the preparation method of bagged slow-release fertilizer described in step (5)) is applied in each groove and covered with soil. The fertilization position is not the same as the position of the previous year, so as to strengthen the uniform growth of shallow roots to all sides, effectively improve the typhoon resistance, and promote the rapid maturity of eucalyptus.

[0233] Comparative Example 1

[0234] A method for planting eucalyptus comprises the following steps:

[0235] (1) Select forest land

[0236] Eucalyptus planting sites are selected in low mountain and hilly areas with deep soil, loose soil, good drainage and high fertility. The environment should not be lower than -5℃. If the temperature is too low, it is easy to suffer from frost damage.

[0237] (2) Forest land clearing

[0238] The forest land was cleared before planting eucalyptus trees. The forest clearing was completed in August of the previous year, and the debris in the forest was removed and ant killer was placed.

[0239] (3) Planting density

[0240] The eucalyptus planting density is 110 plants / mu, and the spacing between plants and rows is configured in a wide row and narrow plant manner, and the planting holes are arranged at a distance of 2m×3m, which can greatly improve the utilization efficiency of the planting area.

[0241] (4) Planting pit digging

[0242] The eucalyptus planting pit is dug with the following specifications: 50cm×50cm on the surface, 40cm×40cm on the bottom, in an inverted trapezoidal shape, and 60cm deep. The excavated soil is piled up next to the planting pit for later use. The pit digging time should be completed before the end of November of the year before afforestation.

[0243] (5) Apply basal fertilizer

[0244] For basal fertilizer application, first select appropriate basal fertilizer according to local soil conditions and climate characteristics. The nutrient content of basal fertilizer is: 6% nitrogen, phosphorus and potassium, 30% organic matter, and 20 million biological beneficial bacteria per gram. Apply it one month before afforestation, and apply 500g per hole. Spread the basal fertilizer evenly at the bottom of each planting hole, backfill the topsoil to 1 / 3 of the planting pit depth, and mix it thoroughly with the basal fertilizer in the pit. After mixing, backfill the soil dug out next to the planting pit into the pit. The surface of the pit is concave, which is easy to collect water, convenient for future planting, and improves the survival rate.

[0245] (6) Planting method

[0246] Under the condition of ensuring the survival rate of seedlings, plant on the spot and use light substrate container seedlings. Choose to plant after the rain in March. First, dig a 15cm pit in the planting pit, put the light substrate eucalyptus container seedlings in the center of the planting pit and straighten it, then cover it with soil. The soil should be 2cm higher than the surface of the eucalyptus substrate, compact it around, and finally, cover it with a 2cm thick layer of loose soil. If you encounter dry days, water it in time to set the roots. When planting, be careful not to plant the seedlings on the base fertilizer to prevent the roots of the seedlings from contacting the fertilizer and affecting the survival rate. When planting, pay attention to loosening the roots and compacting them so that the roots can be closely combined with the soil.

[0247] (7) Replanting

[0248] Check the survival rate within 8 days after planting and replenish seedlings in time to ensure the survival rate of afforestation that year.

[0249] (8) Topdressing

[0250] Topdressing begins one month after eucalyptus is planted. Dig a 30cm×20cm×15cm (length×width×depth) longitudinal groove 40cm away from the young tree, apply 0.25kg of compound fertilizer to each tree, and cover with soil to promote the growth of eucalyptus. In the second year, topdress once in April, apply 0.5kg of compound fertilizer to each tree. In the third and fourth years, topdress once each, apply 0.8kg of compound fertilizer to each tree to promote the rapid growth of eucalyptus.

[0251] In April 2014, an experiment was conducted in the eucalyptus forest planting area of ​​Nanzhou Forest Farm in Guangxi Zhuang Autonomous Region, with each 20m×20m as an experimental forest. The planting method adopted Examples 1-3 and Comparative Example 1. The tree height and breast diameter were measured from April 2015. All eucalyptus trees in each experimental forest were measured and the average value was taken. The average data of each experimental forest was calculated until April 2018, as shown in Table 1.

[0252] Table 1 Average annual height increase and average annual breast height increase of eucalyptus trees in Examples 1-3 and Comparative Example 1

[0253]

[0254]

[0255] It can be seen from Table 1 that the annual average height increase and annual average breast diameter increase of eucalyptus obtained by the planting methods of Examples 1-3 of the present invention are at least 38.77% and 20.19% higher than the annual average height increase and annual average breast diameter increase of eucalyptus in Comparative Example 1 (prior art), respectively, indicating that the eucalyptus planting method of the present invention has significant progress compared with the prior art.

[0256] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A planting method for promoting the root growth of eucalyptus and effectively improving its typhoon resistance, characterized in that: The following steps are involved: (1) Select forest land Eucalyptus planting sites are selected in hills, terraces, plains or low mountain and hilly areas with deep soil, loose soil, good drainage and high fertility. It should be noted that when selecting forest land, the growth environment of eucalyptus cannot be lower than -5℃. If the temperature is too low, it is easy to be frozen. (2) Forest land clearing Before planting eucalyptus, the forest land should be cleared. The forest land should be cleared from July to September of the previous year. Debris should be removed and ant mites should be applied. (3) Planting density The eucalyptus planting density is 110-120 plants / mu, and the spacing between plants and rows is configured in a wide row and narrow plant manner to improve the utilization efficiency of the planting area; (4) Planting pit digging Dig deep open pits for eucalyptus planting, and pile the excavated soil next to the planting pits for future use. The pit digging time should be completed before the end of November of the year before afforestation; (5) Application of slow-release fertilizer in bottom bags One month before afforestation, select bagged slow-release fertilizer with a long slow-release time and place it at the bottom of the planting pit, and backfill the bagged slow-release fertilizer with the soil dug out from the planting pit. The soil should be backfilled to 1 / 3 of the pit. The purpose of applying bagged slow-release fertilizer with a long slow-release time at the bottom is to utilize the tree root system's tendency to attract fertilizer, guide the deep roots of eucalyptus to grow downward for a long time, and improve the tree's fixation and support capabilities; (6) Apply basal fertilizer For basal fertilizer application, first select appropriate basal fertilizer according to soil conditions and climate characteristics. Apply the basal fertilizer at the same time as the bottom bag controlled slow-release fertilizer. Mix the basal fertilizer and the soil dug out of the pit evenly, then backfill it to 2 / 3 of the planting pit. Finally, backfill the planting pit with the soil dug out beside the planting pit. The surface of the pit is concave, which is easy to collect water, convenient for future planting, and improves the survival rate. (7) Eucalyptus planting Eucalyptus planting should be done on-site, using light substrate container seedlings. Planting should be done from February to March each year, after rain or on cloudy days. When planting, first dig a hole in the planting pit, place the light substrate eucalyptus container seedlings in the center of the planting pit, then cover with soil and straighten it. The covering soil should be higher than the eucalyptus substrate surface by a suitable distance, compact it around, and then cover it with a layer of loose soil. When planting, be careful not to plant the seedlings on the base fertilizer to prevent the roots of the seedlings from directly contacting the fertilizer and affecting the survival rate. When planting, pay attention to relaxing the roots and compacting them so that the roots are closely combined with the soil. (8) Shallow bag controlled slow release fertilizer application After the eucalyptus is planted, the shallow layer of bagged slow-release fertilizer is applied immediately. The bagged slow-release fertilizer with a shorter slow-release time is used for shallow layer of bagged slow-release fertilizer. A pit is dug in front, behind, left and right of the eucalyptus seedlings. Bagged slow-release fertilizer with a shorter slow-release time is put into each pit and covered with soil. After application, water is sprinkled in time to fix the roots. The purpose of shallow layer bagged slow-release fertilizer is to use the tree root system's tendency to attract fertilizer to guide the shallow roots of the eucalyptus to extend and grow around the shallow soil layer, and to assist the deep roots to fix and support the eucalyptus. (9) Replanting 5-15 days after planting, check the survival rate and replenish seedlings in time to ensure the survival rate of the afforestation that year; (10) Top dressing After the first year of eucalyptus planting, no topdressing is required. The fertilizer and nutrients needed by eucalyptus are supplied by the bagged slow-release fertilizer applied during planting. In the second year, the first topdressing is done in March and April. For the first topdressing, a trench is dug in front and behind each young tree. Bagged slow-release fertilizer with a longer slow-release time is applied in each trench and covered with soil to promote the growth of eucalyptus and shallow roots. Referring to this method, topdressing is done once in March and April of the third and fourth years, and the fertilization location is not the same as the previous year to strengthen the uniform growth of shallow roots to the surrounding areas, effectively improve typhoon resistance, and promote rapid maturity of eucalyptus.

2. The planting method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance according to claim 1, characterized in that: In step (3), the planting holes are arranged at a distance of 2m×3m.

3. The planting method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance according to claim 1, characterized in that: The planting pit in step (4) has a size of 50 cm × 50 cm on the surface and 40 cm × 40 cm on the bottom, in an inverted trapezoidal shape, and a pit depth of 60 cm.

4. The planting method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance according to claim 1, characterized in that: In step (5), 2 bags of bagged slow-release fertilizer with a weight of 250 g / bag and a slow-release period of 12 months are placed at the bottom of the planting pit, and the bagged slow-release fertilizer is covered with soil dug out of the planting pit for 20 cm.

5. The planting method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance according to claim 1, characterized in that: The nutrient content of the base fertilizer in step (6) is: 6% nitrogen, phosphorus and potassium, 30% organic matter, and 20 million biological beneficial bacteria per gram.

6. The planting method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance according to claim 1, characterized in that: In step (6), the base fertilizer is applied one month before afforestation, 500 g per hole, the base fertilizer and soil are mixed evenly, and backfilled to 20 cm from the top of the planting pit.

7. The planting method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance according to claim 1, characterized in that: When planting in step (7), first dig a 15 cm hole in the planting pit, place the light substrate eucalyptus container seedling in the center of the planting pit, then straighten and cover with soil, which should be 2 cm higher than the eucalyptus substrate surface, compact it around, and then cover it with a 2 cm thick layer of loose soil.

8. The planting method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance according to claim 1, characterized in that: In step (8), 4 bags of bagged controlled-release fertilizer with a slow-release time of 6 months and a weight of 100 g / bag are selected, and a 30 cm × 20 cm × 10 cm (length × width × depth) trench is dug 20 cm in front, behind, left and right of the eucalyptus seedlings in the horizontal direction. One bag of bagged controlled-release fertilizer with a slow-release time of 6 months and a weight of 100 g / bag is placed in each trench and covered with soil.

9. The planting method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance according to claim 1, characterized in that: In step (10), no top dressing is required in the first year.

10. The planting method for promoting the root growth of eucalyptus and effectively improving the typhoon resistance according to claim 1, characterized in that: In step (10), the first topdressing is performed in March or April of the second year. For the first topdressing, a 30 cm × 20 cm × 10 cm (length × width × depth) trench is dug at 40 cm in front and 40 cm behind each eucalyptus tree. A bag of bagged slow-release fertilizer with a slow-release time of 12 months is applied in each trench and covered with soil. The second topdressing is performed in March or April of the third year. A 30 cm × 20 cm × 10 cm (length × width × depth) trench is dug at 40 cm on the left and 40 cm on the right of each eucalyptus tree. In each trench, 250 g / bag of bagged slow-release fertilizer is applied. The bagged slow-release fertilizer has a slow-release time of 12 months and is covered with soil. Apply 250g / bag of bagged slow-release fertilizer with a slow-release time of 12 months and cover with soil. The fertilization method is the same as the first fertilization, but the position is different. For the third topdressing in March-April of the fourth year, dig a 30cm×20cm×10cm (length×width×depth) trench 40cm in front and 40cm behind each eucalyptus tree, apply 250g / bag of bagged slow-release fertilizer with a slow-release time of 12 months in each trench and cover with soil to promote the growth of eucalyptus and shallow root system. The fertilization method is the same as the first fertilization and the position is the same.

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