Fertilization method for replacing chemical nitrogen fertilizer with organic fertilizer in rubber tapping forest

Abstract

The invention discloses a fertilization method for replacing a chemical nitrogen fertilizer with a rubber tapping forest organic fertilizer, and belongs to the technical field of fertilization. The method comprises the following steps: S1, applying an organic fertilizer before the Spring Festival; s2, topdressing for the first time before rubber tapping in spring; s3, topdressing for the second time in the middle stage of rubber tapping; s4, topdressing for the third time at the last stage of rubber tapping. The fertilizing method disclosed by the invention is suitable for the slightly acidic soil in Hainan, is reasonable in nutrient proportion, accords with the nutrient absorption rule of the rubber forest, can obviously improve the yield of rubber latex, can improve the soil structure and enhance the soil fertility, and reduces the dependence on chemical nitrogen fertilizer, thereby reducing the environmental pollution and promoting the sustainable development of the rubber forest.

Description

Technical Field

[0001] The invention belongs to the technical field of fertilization, and in particular relates to a fertilization method for replacing chemical nitrogen fertilizer with organic fertilizer in a rubber tapping forest. Background Art

[0002] Rubber trees (Hevea brasiliensis) are important cash crops in tropical regions. Their main product is natural rubber, which is widely used in industrial production. Rubber trees were introduced to China in the last century and were planted on a large scale in Hainan, Yunnan and Guangdong in the 1950s. After more than 60 years of development, China's rubber planting area has expanded significantly, from 47,000 mu in 1950 to 17.18 million mu in 2020, making it one of the world's important natural rubber production bases.

[0003] In the current cultivation and management of rubber forests, fertilization is one of the key factors affecting the growth and yield of rubber trees, especially nitrogen fertilizer has a significant effect on the latex yield of rubber trees. However, there is a phenomenon of excessive reliance on chemical nitrogen fertilizers in production at this stage. Although chemical nitrogen fertilizers can increase the yield of rubber trees in the short term, long-term and large-scale use has brought many problems. First, long-term application of chemical fertilizers causes soil compaction and decreased fertility, resulting in obstructed root development of rubber trees and weakened nutrient absorption capacity, which ultimately affects the yield and quality of latex. Secondly, improper fertilization may cause nitrogen to be lost to surrounding water bodies, thereby causing eutrophication and damaging the ecological environment. In addition, excessive application of chemical fertilizers increases planting costs, brings economic burdens, and hinders the sustainable development of the rubber industry. These problems not only limit the continued high yield of rubber trees, but also lead to serious environmental pollution and ecological crises.

[0004] In view of the above status quo, the present application proposes a method for fertilizing rubber forests using organic fertilizers to replace chemical nitrogen fertilizers. Through the rational allocation of organic fertilizers and chemical fertilizers, it is possible to improve soil structure, enhance soil fertility, reduce nitrogen loss, and reduce the risk of environmental pollution while ensuring rubber tree output. In addition, the fertilization method can also effectively reduce planting costs and promote the sustainable development of the rubber industry. Summary of the invention

[0005] To solve the above problems, the object of the present invention is to provide a kind of organic fertilizer for rubber tapping forest to replace chemical nitrogen fertilizer fertilization method.This method not only effectively improves the soil structure of rubber forest, but also improves the absorption efficiency of rubber tree to nutrients, and then improves the yield and quality of natural rubber.Meanwhile, the inventive method reduces the dependence of rubber tree on chemical nitrogen fertilizer, reduces environmental pollution, and promotes the sustainable development of rubber forest.

[0006] In order to achieve the above technical objectives, the inventors adopted a phased fertilization strategy based on the isonitrogen principle and according to the nutrient demand data of rubber trees at different growth stages obtained from a large number of experiments, and at the same time used organic fertilizer to partially or completely replace chemical nitrogen fertilizer to improve the growth rate, health status and natural rubber yield of rubber trees.

[0007] Specifically, the present invention is realized by the following technical scheme: a method for fertilizing rubber forests with organic fertilizers instead of chemical nitrogen fertilizers, which is suitable for acidic soils in Hainan, has a reasonable nutrient ratio, conforms to the law of nutrient absorption by rubber forests, and can significantly increase the yield of rubber latex; and comprises the following steps:

[0008] S1. Before the Spring Festival, apply organic fertilizer as base fertilizer, with an average fertilizer amount of 3.9-15.7 kg / plant. The organic fertilizer is air-dried livestock manure, and its nutrient content is: C 200-230 g kg -1 TN 16~20g·kg -1 ,TP 4~5g·kg -1 , TK 3~3.5g·kg -1 ;

[0009] S2, before spring rubber tapping, the first topdressing was carried out with chemical fertilizers, with an average fertilizer amount of: nitrogen 0-105g / plant, phosphorus pentoxide 0-50.6g / plant and potassium oxide 59.7-82.4g / plant;

[0010] S3, in the middle of rubber tapping, chemical fertilizers were applied for the second topdressing, with an average fertilizer amount of: nitrogen 0-52.5g / plant, phosphorus pentoxide 0-25.3g / plant and potassium oxide 29.8-41.2g / plant;

[0011] S4, at the end of rubber tapping, apply chemical fertilizers for the third topdressing, with an average fertilizer amount of: nitrogen 0-52.5g / plant, phosphorus pentoxide 0-25.3g / plant and potassium oxide 29.8-41.2g / plant.

[0012] It should be noted that by adopting the above technical scheme, different fertilization methods are used in different tapping stages of rubber forests, reasonable nutrient supply is carried out for rubber trees at different growth stages, and the fertilization ratio is optimized, which significantly improves the nutrient absorption efficiency of rubber trees and the yield and quality of natural rubber, while reducing the use of chemical nitrogen fertilizers and effectively reducing environmental pollution, thereby achieving the sustainable development goal of rubber forests. The specific technical concept is:

[0013] First, apply organic fertilizers before the Spring Festival. The organic fertilizers are rich in nitrogen, phosphorus, potassium and other major nutrients to increase the organic matter content of the soil, improve the soil structure, and provide a stable nutritional basis for rubber trees to promote the root development, leaf growth and latex production of rubber trees. The supply of nitrogen can support plant growth and photosynthesis; phosphorus plays a key role in root development and energy metabolism, which helps the strong growth of the root system and the conversion of cell energy; potassium not only improves the stress resistance of rubber trees, enhances their ability to resist pests and diseases and adverse environments, but also effectively promotes the transportation of nutrients in the plant body, ensuring the efficient use of nutrients from the root system to all parts of the tree. The scientific application of organic fertilizers can not only provide long-term and stable nutritional support for the healthy growth of rubber trees, but also significantly improve the yield and quality of natural rubber, and provide guarantees for the sustainable high yield of rubber forests.

[0014] Secondly, before the spring rubber tapping, the first topdressing is carried out, and two parts of chemical fertilizer are applied to provide sufficient nitrogen to support the rapid growth and latex secretion of rubber trees. The application of fertilizers rich in nitrogen, phosphorus and potassium can quickly replenish the key nutrients needed for the growth of rubber trees, especially before the latex production begins, to ensure its adequate nutrient supply. The supplement of nitrogen can promote the growth and photosynthesis of rubber trees and enhance the vitality of leaves; phosphorus fertilizer can help the further development and energy metabolism of the root system and improve the root system's ability to absorb water and nutrients; the application of potassium fertilizer can improve the stress resistance of rubber trees, enhance their resistance to environmental stresses such as diseases and drought, and promote the production and transportation of latex. Reasonable fertilization during this topdressing stage can lay a solid foundation for the healthy growth of rubber trees and efficient rubber tapping.

[0015] Then, in the middle of the rubber tapping period, the second topdressing is carried out, and 1 part of chemical fertilizer is applied to ensure that the rubber trees obtain the necessary nutritional support during the high-intensity production stage and maintain the stable output of latex. The chemical fertilizers applied are mainly nitrogen, phosphorus and potassium at lower doses (the application amount of effective elements is half of S2) to maintain the growth needs of rubber trees and latex production. Nitrogen can maintain the photosynthesis of leaves and ensure the health and vitality of plants; phosphorus pentoxide supports the stable growth and energy metabolism of the root system; potassium oxide plays a particularly critical role in this stage, which can improve the stress resistance of rubber trees and the efficiency of latex transportation, and further promote the quality and yield of latex.

[0016] Finally, at the end of the rubber tapping period, the third topdressing is carried out, with 1 part of chemical fertilizer applied, maintaining the same amount of fertilizer as in the S3 stage to ensure that the rubber tree obtains sufficient nutrition at this stage. At this time, the metabolic activity of the rubber tree gradually slows down, but it is still necessary to supplement nitrogen, phosphorus, and potassium in appropriate amounts to support the health of the tree and stable latex production. Maintaining a balanced supply of nitrogen, phosphorus, and potassium will help improve the stress resistance of the rubber tree, maintain its growth state, and ensure the stability of natural rubber production, preparing for the production of the next year.

[0017] Further preferably, in the above-mentioned method for fertilizing rubber forests with organic fertilizer instead of chemical nitrogen fertilizer, the livestock manure in S1 is selected from at least one of the following: cow manure, pig manure, horse manure, and sheep manure. In a preferred embodiment of the present invention, the organic fertilizer used is cow manure, and the nutrient content after air drying is: C 216.7g·kg -1 ,TN 17.8g·kg -1 ,TP4.3g·kg -1 , TK 3.2 g kg -1 .

[0018] Further preferably, in the most preferred embodiment of the present invention, in the method for fertilizing rubber forests with organic fertilizer instead of chemical nitrogen fertilizer as described above, the average fertilizer amount of S1 is 7.5-8 kg / plant.

[0019] Further preferably, in the most preferred embodiment of the present invention, in the method of fertilizing rubber forests with organic fertilizer instead of chemical nitrogen fertilizer as described above, the average fertilizer amount of S2 is 70g / plant nitrogen, 31.2g / plant phosphorus pentoxide and 74.8g / plant potassium oxide; the average fertilizer amounts of S3 and S4 are both 35g / plant nitrogen, 15.6g / plant phosphorus pentoxide and 37.4g / plant potassium oxide.

[0020] Further preferably, in the method for fertilizing rubber forests with organic fertilizer instead of chemical nitrogen fertilizer as described above, the fertilization method in S1, S2, S3 and S4 is as follows: digging a fertilization hole of (140-160)×(75-85)×(45-55) cm between two rubber trees, applying fertilizer evenly in the hole, and then covering with soil, wherein the amount of fertilizer applied in the fertilization hole each time is the total fertilizer requirement of the two rubber trees.

[0021] Still further preferably, in the method for fertilizing rubber forests with organic fertilizer instead of chemical nitrogen fertilizer as described above, the vertical distance between the fertilization hole and the rubber tree trunk is 1.4 to 1.6 m.

[0022] Still further preferably, in the method for fertilizing rubber forests with organic fertilizer instead of chemical nitrogen fertilizer as described above, the time for applying organic fertilizer S1 is January.

[0023] Still further preferably, in the method for fertilizing rubber forests with organic fertilizer instead of chemical nitrogen fertilizer as described above, the first topdressing time of S2 is April.

[0024] Still further preferably, in the method for fertilizing rubber forests with organic fertilizer instead of chemical nitrogen fertilizer as described above, the time for the second topdressing in S3 is June.

[0025] Still further preferably, in the method for fertilizing rubber forests with organic fertilizer instead of chemical nitrogen fertilizer as described above, the time for the third topdressing in S4 is September.

[0026] Compared with the prior art, the fertilization method for tapping rubber forests with organic fertilizer replacing chemical nitrogen fertilizer provided by the present invention has the following advantages and beneficial effects:

[0027] (1) By providing a reasonable fertilization scheme according to the nutritional requirements of rubber trees at different growth stages, the present invention enables organic fertilizers to effectively replace chemical nitrogen fertilizers, which not only improves the growth rate and health of rubber trees, but also improves the yield and quality of natural rubber.

[0028] (2) By applying a combination of organic fertilizer and chemical fertilizer, soil structure and soil fertility can be improved, while reducing dependence on chemical nitrogen fertilizers, thereby reducing environmental pollution and promoting the sustainable development of rubber forests. This fertilization method not only improves the rubber production capacity of rubber trees, but also optimizes the overall growth environment, with significant economic and ecological benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 : Bar graph of annual rubber production of rubber trees in different fertilization treatment groups.

[0030] Figure 2 : Bar graph showing the changes in soil organic carbon content in rubber plantations under different fertilization treatments.

[0031] Figure 3 : Bar graph showing the changes in total nitrogen content in rubber plantation soil under different fertilization treatments.

[0032] Figure 4 : Bar graph showing the changes in total phosphorus content in rubber plantation soil under different fertilization treatments.

[0033] Figure 5 : Select test plots in the field.

[0034] Figure 6 : Selection of sample trees for field trials and hanging of tree signs.

[0035] Figure 7 : Dig holes for fertilizer.

[0036] Figure 8 : Apply organic fertilizer (cow dung).

[0037] Fig. 9 : Different treated fertilizers are packaged separately (urea + superphosphate + potassium chloride).

[0038] Fig.10 : Fertilization is completed and covered.

[0039] Fig.11 : Sample trees under different treatments.

[0040] Fig.12 : The test layout is completed. DETAILED DESCRIPTION

[0041] The technical solution of the present invention is described clearly and completely below through specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on this embodiment, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0042] Example 1

[0043] NPK: Conventional fertilization treatment, using a standard fertilizer formula.

[0044] S1, no organic fertilizer or chemical fertilizer was applied during the growing period before the Spring Festival (January);

[0045] S2, before spring rubber tapping (April), the first topdressing. The effective ingredients of the fertilizer applied to each rubber tree in the topdressing are 140g of nitrogen / plant, 70g of phosphorus pentoxide / plant and 90g of potassium oxide / plant.

[0046] S3, in the middle of rubber tapping (June), the second topdressing was carried out. The effective components of the fertilizer applied to each rubber tree in the topdressing were 70g of nitrogen / plant, 35g of phosphorus pentoxide / plant and 45g of potassium oxide / plant.

[0047] S4, at the end of the rubber tapping period (September), the third topdressing was carried out. The effective components of the fertilizer applied to each rubber tree in the topdressing were 70g of nitrogen / tree, 35g of phosphorus pentoxide / tree and 45g of potassium oxide / tree.

[0048] Example 2

[0049] 25%M: Organic fertilizer replaces 25% of chemical fertilizer nitrogen.

[0050] S1, 3.9 kg / plant of air-dried organic fertilizer was applied during the growth period before the Spring Festival (January). The organic fertilizer was cow dung manure, and its nutrient content after air drying was measured to be: C 216.7 g kg -1 ,TN 17.8g·kg -1 ,TP 4.3g·kg -1 , TK 3.2 g kg -1 .

[0051] S2, before spring rubber tapping (April), the first topdressing. The effective components of the fertilizer applied to each rubber tree in the topdressing were 105g of nitrogen per tree, 50.6g of phosphorus pentoxide per tree, and 82.4g of potassium oxide per tree.

[0052] S3, in the middle of rubber tapping (June), the second topdressing was carried out. The effective components of the fertilizer applied to each rubber tree in the topdressing were 52.5g of nitrogen / plant, 25.3g of phosphorus pentoxide / plant and 41.2g of potassium oxide / plant.

[0053] S4, at the end of the rubber tapping period (September), the third topdressing was carried out. The effective components of the fertilizer applied to each rubber tree in the topdressing were 52.5g of nitrogen / tree, 25.3g of phosphorus pentoxide / tree and 41.2g of potassium oxide / tree.

[0054] Example 3

[0055] 50%M: Organic fertilizer replaces 50% of chemical fertilizer nitrogen.

[0056] S1, 7.9 kg / plant of air-dried organic fertilizer was applied during the growth period before the Spring Festival (January). The organic fertilizer was cow dung manure, and its nutrient content after air drying was measured to be: C 216.7 g kg -1 ,TN 17.8g·kg -1 ,TP 4.3g·kg -1 , TK 3.2 g kg -1 .

[0057] S2, before spring rubber tapping (April), the first topdressing, in which the effective components of the fertilizer applied to each rubber tree were 70g of nitrogen, 31.2g of phosphorus pentoxide and 74.8g of potassium oxide.

[0058] S3, in the middle of rubber tapping (June), the second topdressing was carried out. The effective components of the fertilizer applied to each rubber tree in the topdressing were 35g of nitrogen / plant, 15.6g of phosphorus pentoxide / plant and 37.4g of potassium oxide / plant.

[0059] S4, at the end of the rubber tapping period (September), the third topdressing was carried out. The effective components of the fertilizer applied to each rubber tree in the topdressing were 35g of nitrogen per tree, 15.6g of phosphorus pentoxide per tree, and 37.4g of potassium oxide per tree.

[0060] Example 4

[0061] 75%M: Organic fertilizer replaces 75% of chemical fertilizer nitrogen.

[0062] S1, apply 11.8kg / plant of air-dried organic fertilizer in the growth period before the Spring Festival (January). The organic fertilizer is cow dung manure, and its nutrient content after air drying is: C 216.7g kg -1 ,TN 17.8g·kg -1 ,TP 4.3g·kg -1 , TK 3.2 g kg -1 .

[0063] S2, before spring rubber tapping (April), the first topdressing was carried out. The effective components of the fertilizer applied to each rubber tree in the topdressing were 35g of nitrogen per tree, 11.8g of phosphorus pentoxide per tree, and 67.2g of potassium oxide per tree.

[0064] S3, in the middle of rubber tapping (June), the second topdressing was carried out. The effective components of the fertilizer applied to each rubber tree in the topdressing were 17.5g of nitrogen / plant, 5.9g of phosphorus pentoxide / plant and 33.6g of potassium oxide / plant.

[0065] S4, at the end of the rubber tapping period (September), the third topdressing was carried out. The effective components of the fertilizer applied to each rubber tree in the topdressing were 17.5g of nitrogen / plant, 5.9g of phosphorus pentoxide / plant and 33.6g of potassium oxide / plant.

[0066] Example 5

[0067] 100% M: Organic fertilizer replaces 100% of chemical fertilizer nitrogen.

[0068] S1, apply 15.7kg / plant of air-dried organic fertilizer in the growth period before the Spring Festival (January). The organic fertilizer is cow dung manure, and its nutrient content after air drying is: C 216.7g kg -1 ,TN 17.8g·kg -1 ,TP 4.3g·kg -1 , TK 3.2 g kg -1 .

[0069] S2, before spring rubber tapping (April), the first topdressing was carried out. The effective components of the fertilizer applied to each rubber tree in the topdressing were nitrogen 0g / plant, phosphorus pentoxide 0g / plant and potassium oxide 59.7g / plant.

[0070] S3, in the middle of rubber tapping (June), the second topdressing was carried out. The effective components of the fertilizer applied to each rubber tree in the topdressing were nitrogen 0g / plant, phosphorus pentoxide 0g / plant and potassium oxide 29.8g / plant.

[0071] S4, at the end of the rubber tapping period (September), the third topdressing was carried out. The effective components of the fertilizer applied to each rubber tree in the topdressing were nitrogen 0g / plant, phosphorus pentoxide 0g / plant and potassium oxide 29.8g / plant.

[0072] This experiment is a control experiment, with conventionally fertilized rubber trees as the control group. The experiment was conducted in the tapping rubber forest of Zhubijiang Farm in Baisha Li Autonomous County in central Hainan Island from 2020 to 2021. The experiment set up 5 treatments (Example 1-Example 5): conventional fertilization treatment (NPK), organic fertilizer nitrogen replacing 25% chemical fertilizer nitrogen (25%M), organic fertilizer nitrogen replacing 50% chemical fertilizer nitrogen (50%M), organic fertilizer nitrogen replacing 75% chemical fertilizer nitrogen (75%M) and organic fertilizer nitrogen replacing 100% chemical fertilizer nitrogen (100%M). Each treatment was repeated in 3 groups, with a total of 15 test plots. 20 rubber trees with good growth and normal rubber discharge were selected in each plot, and a total of 300 test sample trees were selected.

[0073] According to the fertilization standards of local farms, the annual fertilizer application rate for each rubber tree is 2.0 kg of compound fertilizer (N: P2O5: K2O = 15: 9: 6), which is equivalent to 280 g N per tree. -1 ·yr -1 , 140g P2O5 strain -1 ·yr -1 , 180g K2O strain -1 ·yr -1 The nitrogen fertilizer used in the experiment was urea (containing 46% N), the phosphorus fertilizer was ordinary superphosphate (containing 12% effective P2O5), and the potash fertilizer was potassium chloride (containing 60% K2O). This is equivalent to 608g of urea per plant. -1 ·yr -1 , superphosphate is 1167g / plant -1 ·yr -1 , potassium chloride is 300g / plant -1 ·yr -1 All treatments were designed based on the principle of equal nitrogen content. The amount of phosphorus and potassium fertilizers was calculated based on the amount of nitrogen fertilizer. In some organic fertilizer treatments, when phosphorus and potassium fertilizers were insufficient, they were supplemented with single chemical fertilizers. The organic fertilizer used as an alternative was cow manure from a nearby farm. After air drying, its nutrient content was measured to be: C 216.7 g kg -1 ,TN 17.8g·kg -1 ,TP4.3 g·kg -1 , TK3.2g·kg -1 .

[0074] Organic fertilizer was applied as base fertilizer once before the Spring Festival (January) every year, and chemical fertilizer was applied three times in April, June and September at a ratio of 2:1:1. The fertilization method was hole fertilization, and the fertilization hole was located between two rubber trees (150×80×50cm), about 1.5m vertically away from the main trunk of the rubber tree. The fertilizer was evenly applied in the hole and then covered with soil. The fertilizer application ratio of each rubber tree in different treatment groups at each stage is shown in Tables 1 to 4:

[0075] Table 1 Weight parts of each element or fertilizer in the first fertilization in S1

[0076]

[0077] Table 2 Weight of each element or fertilizer in the first topdressing in S2

[0078]

[0079] Table 3 Weight of each element or fertilizer in the second topdressing in S3

[0080]

[0081] Table 4 Weight of each element or fertilizer in the third topdressing in S4

[0082]

[0083] As shown in Table 5, the annual rubber yield of a single rubber tree in each fertilization setting in 2020 and 2021 was 8.89-10.30 kg / tree and 12.78-15.15 kg / tree, respectively. Among them, the annual rubber yield of the NPK treatment group was the lowest, and different proportions of organic fertilizer replacing nitrogen fertilizer treatment groups could effectively increase the annual rubber yield. The annual average rubber yield of each organic fertilizer replacing nitrogen fertilizer treatment group was slightly different, and the rubber yield from high to low was: 100% M, 25% M, 50% M and 75% M.

[0084] Table 5 Annual rubber production of rubber trees under different fertilization treatments

[0085]

[0086] Note: Values ​​are shown as mean ± standard deviation.

[0087] As shown in Table 6, the nutrient content of each soil in 2021 was slightly higher than that in 2020, and each fertilization treatment could increase the nutrient content of the soil. Among them, the 50% M treatment group had the largest increase in soil organic carbon content; the NPK treatment group had the largest increase in soil total nitrogen content, followed by the 50% M treatment group; the 50% M treatment group had the largest increase in soil total phosphorus content. In terms of the increase in soil nutrients, the 50% M treatment had the best effect in improving soil nutrients.

[0088] Table 6 Changes of soil nutrients in rubber plantations under different fertilization treatments

[0089]

[0090] Note: Values ​​are shown as mean ± standard deviation.

[0091] The experimental results show that: compared with conventional fertilization treatment, the different proportions of organic fertilizers replacing chemical fertilizers proposed in the present invention have a significant promoting effect on rubber production. The rubber production of each organic fertilizer replacing nitrogen fertilizer treatment group is from high to low: 100% M, 25% M, 50% M and 75% M, but the difference is small. In addition, all treatment groups have increased the soil nutrient content, among which the 50% M treatment group has the best improvement effect. Comprehensively from the rubber yield and soil nutrient effect, it is determined that 50% organic fertilizer replacing nitrogen fertilizer (50% M) is the best solution.

Claims

1. A method for fertilizing rubber forests by using organic fertilizer to replace chemical nitrogen fertilizer, It is characterized in that This method is applicable to Hainan's acidic soil and includes the following steps: S1. Before the Spring Festival, apply organic fertilizer as base fertilizer, with an average fertilizer amount of 3.9-15.7 kg / plant. The organic fertilizer is air-dried livestock manure, and its nutrient content is: C 200-230 g kg -1 TN 16~20g·kg -1 ,TP 4~5g·kg -1 , TK 3~3.5g·kg -1 ; S2, before spring rubber tapping, the first topdressing was carried out with chemical fertilizers, with an average fertilizer amount of: nitrogen 0-105g / plant, phosphorus pentoxide 0-50.6g / plant and potassium oxide 59.7-82.4g / plant; S3, in the middle of rubber tapping, chemical fertilizers were applied for the second topdressing, with an average fertilizer amount of: nitrogen 0-50.25g / plant, phosphorus pentoxide 0-25.3g / plant and potassium oxide 29.8-41.2g / plant; S4, at the end of rubber tapping, apply chemical fertilizers for the third topdressing, with an average fertilizer amount of: nitrogen 0-50.25g / plant, phosphorus pentoxide 0-25.3g / plant and potassium oxide 29.8-41.2g / plant.

2. according to the fertilization method of tapping rubber forest organic fertilizer replacing chemical nitrogen fertilizer according to claim 1, It is characterized in that The livestock manure is selected from at least one of the following: cow manure, pig manure, horse manure, and sheep manure.

3. According to the fertilization method of tapping rubber forest organic fertilizer replacing chemical nitrogen fertilizer according to claim 1, It is characterized in that The average fertilizer amount of S1 is 7.5-8 kg / plant.

4. According to the fertilization method of tapping rubber forest organic fertilizer replacing chemical nitrogen fertilizer according to claim 1, It is characterized in that The average fertilizer amount for S2 was 70 g / plant of nitrogen, 31.2 g / plant of phosphorus pentoxide and 74.8 g / plant of potassium oxide; the average fertilizer amount for S3 and S4 was 35 g / plant of nitrogen, 15.6 g / plant of phosphorus pentoxide and 37.4 g / plant of potassium oxide.

5. According to the fertilization method of tapping rubber forest organic fertilizer replacing chemical nitrogen fertilizer according to claim 1, It is characterized in that The fertilization method in S1, S2, S3 and S4 is: dig a fertilizer hole of (140-160)×(75-85)×(45-55) cm between two rubber trees, apply fertilizer evenly in the hole, and then cover with soil. The amount of fertilizer applied in the fertilizer hole each time is the total fertilizer requirement of the two rubber trees.

6. According to the fertilization method of tapping rubber forest organic fertilizer replacing chemical nitrogen fertilizer according to claim 5, It is characterized in that The vertical distance between the fertilization hole and the main trunk of the rubber tree is 1.4 to 1.6 meters.

7. A fertilizing method for replacing chemical nitrogen fertilizer with organic fertilizer in rubber forests according to any one of claims 1 to 6, It is characterized in that S1 The time for applying organic fertilizer is January.

8. A fertilizing method for replacing chemical nitrogen fertilizer with organic fertilizer in rubber forests according to any one of claims 1 to 6, It is characterized in that The first topdressing time for S2 is April.

9. A fertilizing method for replacing chemical nitrogen fertilizer with organic fertilizer in rubber forests according to any one of claims 1 to 6, It is characterized in that The second top dressing time for S3 is in June.

10. A fertilization method for replacing chemical nitrogen fertilizer with organic fertilizer in rubber forests according to any one of claims 1 to 6, It is characterized in that The third top dressing of S4 is in September.

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