Method for tending and rejuvenating low-yield camellia oleifera forest

Abstract

The invention discloses a method for tending and rejuvenating a low-yield camellia oleifera forest, and belongs to the technical field of camellia oleifera planting management, the method comprises the following steps: (1) forest land cleaning: removing vines and weeds in the camellia oleifera forest, and crushing caked soil; (2) thinning and pruning: keeping the camellia oleifera trees with good varieties and excellent growth vigor for tending, completely digging out the rest of camellia oleifera trees with uncomfortable growth vigor and poor growth vigor, selecting excellent varieties in sparse places for complementary planting, and pruning the camellia oleifera trees at the same time; (3) application of a rejuvenation agent: applying a rejuvenation agent A and / or a rejuvenation agent B to soil around the camellia oleifera trees; and (4) final-period management: performing water and fertilizer management and pest and disease damage management on the camellia oleifera. The problem of poor tending and rejuvenation effects of the low-yield camellia oleifera forest is solved.

Description

Technical Field

[0001] The invention relates to the technical field of oil-tea camellia planting and management, and in particular to a method for tending and rejuvenating low-yield oil-tea camellia forests. Background Art

[0002] Camellia oleifera Abel belongs to the genus Camellia of the Theaceae family. It is an evergreen small tree or shrub economic forest species with a wide range of adaptability and high economic value. It is the main woody oil tree species in my country. The tea oil made from camellia oleifera is rich in nutrients, rich in oleic acid, linoleic acid, etc., and has a mellow taste. It is a high-quality edible oil; it is also an excellent industrial raw material and can be used in soap, cosmetics, rubber and other industries. Low-yield camellia oleifera forest refers to its annual average oil production of 150kg / hm 2 The following oil-tea forests are mainly caused by the barrenness of forest land, mixed varieties of planted oil-tea trees, extensive forest management and poor management. At present, the area of ​​low-yield oil-tea in my country is still large, which seriously reduces the production efficiency of oil-tea forests. Therefore, how to transform low-yield oil-tea and promote the high-quality development of the oil-tea industry is an urgent problem to be solved. At present, when rejuvenating and transforming oil-tea forests, the main method is to strengthen the tending management, including forest land clearing, thinning and replanting, pruning and shaping, etc., but the effect is slow and the transformation effect is poor. This is mainly due to the decline of the trees themselves and the poor soil conditions that affect the growth of the root system.

[0003] Therefore, the present invention provides a method for tending and rejuvenating low-yield oil-tea camellia forests, which can be used to rejuvenate low-yield oil-tea camellia trees and increase the yield of the low-yield oil-tea camellia forests. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a method for tending and rejuvenation of low-yield tea oil forests to solve the problem of poor tending and rejuvenation effects of low-yield tea oil forests.

[0005] The present invention solves the above technical problems by the following technical means:

[0006] (1) Forest clearing: remove vines and weeds from the oil tea forest and break up the soil clumps;

[0007] (2) Thinning and pruning: Keep the tea trees with good varieties and good growth and cultivate them, and remove all the other varieties that are not suitable for growth and have poor growth. At the same time, select good varieties to replant in sparse areas, and at the same time remove some large, excessive and dense branches, and at the same time cut back some weak branches, dead branches, diseased and insect-infested branches;

[0008] (3) Application of rejuvenation agent: Apply rejuvenation agent A and / or rejuvenation agent B to the soil around the tea oil tree;

[0009] (4) Post-management: Dig trenches on the outer edge of the oil tea tree canopy and apply fertilizer, applying 30-50 kg / mu of nitrogen fertilizer. Regularly spray 1% Bordeaux mixture or 50% carbendazim from April to July each year to prevent and control diseases and pests.

[0010] Furthermore, the planting density of the oil tea forest after the intermediate dense planting and sparse planting in step (3) is 55-74 plants / mu.

[0011] Through thinning and sparse planting, the overall density of the oil tea forest can be reduced, and replanting in sparse areas can make the structure of the oil tea forest more reasonable and improve the overall production potential. At the same time, combined with pruning and shaping, the light in the oil tea forest can be increased, which can promote photosynthesis of oil tea trees, increase the utilization rate of light energy, and improve ventilation conditions in the oil tea forest, reducing the occurrence of diseases and pests.

[0012] Further, the preparation method of the rejuvenation agent A is as follows:

[0013] Add polyaspartic acid to water and stir evenly to obtain a polyaspartic acid solution, then heat the solution to 70-80°C, add carrageenan, mix evenly and cool to room temperature, add calcium peroxide and sophorolipids and stir evenly to obtain gel A, then freeze gel A at -10 to -5°C for 40-50 minutes and crush to obtain rejuvenation agent A.

[0014] Furthermore, the mass ratio of polyaspartic acid, calcium peroxide, sophorolipids and carrageenan in the rejuvenation agent A is (1-1.2):(6-8):(0.6-0.8):(4-5).

[0015] Furthermore, the particle size of the calcium peroxide is 0.1-0.2 mm, and the particle size of the rejuvenation agent A is 0.1-0.2 cm.

[0016] Further, the preparation method of the rejuvenation agent B is as follows:

[0017] Sodium trimetaphosphate is added to water and stirred to obtain a sodium trimetaphosphate solution. Then, sodium metasilicate and phosphatidylcholine are added to the sodium trimetaphosphate solution. After mixing, sodium alginate and gelatin are added to obtain solution B. Solution B is dropped into a 10wt% calcium chloride solution to obtain gel particles. After drying at 20-30°C for 1-2h, a rejuvenation agent B is obtained.

[0018] Furthermore, the mass ratio of sodium trimetaphosphate, sodium metasilicate, phosphatidylcholine, sodium alginate and gelatin in the rejuvenation agent B is (1.5-2):(1-1.2):(0.8-1.2):(2-3):(2-3).

[0019] Furthermore, the particle size of the rejuvenation agent B is 0.1-0.2 cm.

[0020] Furthermore, the method of using the rejuvenation agent A and the rejuvenation agent B in step (4) is: applying the rejuvenation agent A and / or the rejuvenation agent B within a range of 20-30 cm around the oil tea tree, specifically applying the rejuvenation agent A and the rejuvenation agent B to the retained oil tea trees, and only applying the rejuvenation agent B to the newly planted trees.

[0021] Furthermore, the rejuvenation agent A is applied at 15-20 cm below the soil, and the amount used is 0.5-1 kg / plant. The rejuvenation agent B is applied at 25-30 cm below the soil, and the amount used is 0.5-1 kg / plant.

[0022] A rejuvenation agent is applied around the oil-tea tree, and rejuvenation agent A and rejuvenation agent B are applied to the retained oil-tea tree, and only rejuvenation agent B is applied to the newly planted tree. Rejuvenating agent A contains calcium peroxide, which can gradually and slowly decompose in the soil to generate oxygen. Therefore, rejuvenation agent A can continuously provide oxygen to the oil-tea root system, promote the respiration of the oil-tea root system, and improve the vitality of the root system, thereby promoting the growth of the oil-tea. At the same time, polyaspartic acid is added to the rejuvenation agent A as a carbon source to attract microorganisms in the soil to gather at the rejuvenation agent A and improve the activity of the microorganisms. The gathered microorganisms can quickly decompose the rejuvenation agent A; Sophora biosurfactant is also added to the rejuvenation agent A, which can hinder the aggregation between carrageenan molecules, reduce the interaction force between carrageenan molecules in the rejuvenation agent A, and make the gel structure formed by carrageenan loose, thereby promoting the decomposition of the rejuvenation agent A and promoting the rejuvenation agent A to improve the vitality of the oil-tea root system.

[0023] However, excessive calcium ions absorbed by camellia oleifera will cause slow growth, sparse leaves, yellowing and wilting. Therefore, while using rejuvenation agent A, rejuvenation agent B is applied to the lower layer of rejuvenation agent A. The calcium ions produced by rejuvenation agent A migrate downward and complex with sodium trimetaphosphate and sodium metasilicate contained in rejuvenation agent B, thereby reducing the impact of calcium ions on the soil. A certain amount of phosphatidylcholine is also added to rejuvenation agent B to interact with gelatin molecules, enhance the cross-linking of the three-dimensional structure of gelatin, and then form a stable cross-linking structure, so that rejuvenation agent B can slowly release the effective ingredients sodium trimetaphosphate and sodium metasilicate, prevent sodium trimetaphosphate and sodium metasilicate from being absorbed too quickly by the roots of camellia oleifera, and cause the calcium ions produced by rejuvenation agent A to be unable to be effectively processed. At the same time, sodium trimetaphosphate and sodium metasilicate in rejuvenation agent B can also serve as fertilizer substances in the soil, continue to provide nutrients for the growth of camellia oleifera, so as to promote the growth of camellia oleifera, and at the same time avoid the phenomenon of root burn caused by the rapid decomposition of rejuvenation agent B to the newly transplanted camellia oleifera roots.

[0024] Beneficial effects:

[0025] The present invention combines the traditional method of transforming low-yield camellia oil forests, applies a rejuvenation agent around the camellia oil trees, can effectively promote the growth of camellia oil, and improve the current status of low-yield camellia oil forests. The present invention not only increases the yield of camellia oil forests to meet the increasing market demand for camellia oil and promote the high-quality development of the camellia oil industry, but also can reduce labor costs, effectively promote forestry efficiency and increase farmers' income. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 : Picture of the oil tea forest after nurturing and rejuvenation. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to specific embodiments:

[0028] Embodiment 1:

[0029] Preparation of Rejuvenating Agent A:

[0030] 1 g of polyaspartic acid was added to 120 mL of water and stirred evenly to obtain a polyaspartic acid solution. The solution was then heated to 70°C, 4 g of carrageenan was added, the mixture was mixed evenly and then cooled to room temperature. 6 g of calcium peroxide of about 0.1 mm and 0.6 g of sophora biosurfactant were added and stirred evenly to obtain gel A. The gel A was then frozen at -10°C for 40 min and crushed to obtain a rejuvenation agent A of about 0.1 cm.

[0031] Preparation of rejuvenation agent B:

[0032] 1.5 g of sodium trimetaphosphate was added to 100 mL of water and stirred to obtain a sodium trimetaphosphate solution. Subsequently, 1 g of sodium metasilicate and 0.8 g of phosphatidylcholine were added to the sodium trimetaphosphate solution. After mixing, 2 g of sodium alginate and 2 g of gelatin were added to obtain a solution B. The solution was dropped into a 10 wt % calcium chloride solution to obtain gel particles. After drying at 20° C. for 1 h, a rejuvenation agent B was obtained.

[0033] Methods for tending and rejuvenation of low-yield camellia forests:

[0034] (1) Forest clearing: remove vines and weeds from the oil tea forest and break up the soil clumps;

[0035] (2) Thinning and pruning: Keep the oil tea trees with good varieties and good growth for cultivation, and remove all the other varieties that are not suitable for growth and have poor growth. In the sparse areas, select excellent varieties for replanting, so that the planting density of the oil tea forest after thinning is 55 trees / mu. At the same time, remove some large, excessive and dense branches, and cut back some weak branches, dead branches, diseased and insect-infested branches;

[0036] (3) Application of rejuvenation agent: Apply rejuvenation agent B 25 cm downward from the soil within 20 cm around all oil tea trees, with the amount used being 0.5 kg / tree. Then apply rejuvenation agent A 15 cm downward from the soil within 20 cm around the remaining oil tea trees, with the amount used being 0.5 kg / tree.

[0037] (4) Post-management: Dig trenches on the outer edge of the oil tea tree canopy and apply fertilizer, applying 0.2 kg of nitrogen fertilizer per tree. Spray 50% carbendazim every half month from April to July each year to prevent and control diseases and insect pests.

[0038] Embodiment 2:

[0039] Preparation of Rejuvenating Agent A:

[0040] 1.1 g of polyaspartic acid was added to 135 mL of water and stirred evenly to obtain a polyaspartic acid solution. The solution was then heated to 75°C, 4.5 g of carrageenan was added, mixed evenly and cooled to room temperature, 7 g of calcium peroxide of about 0.15 mm and 0.7 g of sophora biosurfactant were added and stirred evenly to obtain gel A. The gel A was then frozen at -8°C for 45 min and crushed to obtain a rejuvenation agent A of about 0.15 cm.

[0041] Preparation of rejuvenation agent B:

[0042] 1.75 g of sodium trimetaphosphate was added to 125 mL of water and stirred to obtain a sodium trimetaphosphate solution. Subsequently, 1.1 g of sodium metasilicate and 1 g of phosphatidylcholine were added to the sodium trimetaphosphate solution. After mixing, 2.5 g of sodium alginate and 2.5 g of gelatin were added to obtain a solution B. The solution was dropped into a 10 wt % calcium chloride solution to obtain gel particles. After drying at 25° C. for 1.5 h, a rejuvenation agent B was obtained.

[0043] Methods for tending and rejuvenation of low-yield camellia forests:

[0044] (1) Forest clearing: remove vines and weeds from the oil tea forest and break up the soil clumps;

[0045] (2) Thinning and pruning: Keep the oil tea trees with good varieties and good growth for cultivation, and remove all the other varieties that are not suitable for growth and have poor growth. In the sparse areas, select excellent varieties for replanting, so that the planting density of the oil tea forest after thinning is 65 trees / mu. At the same time, remove some large, excessive and dense branches, and cut back some weak branches, dead branches, diseased and insect-infested branches;

[0046] (3) Application of rejuvenation agent: Apply rejuvenation agent B at a depth of 28 cm from the soil within 23 cm around all oil tea trees, with a usage amount of 0.75 kg / tree. Then apply rejuvenation agent A at a depth of 18 cm from the soil within 23 cm around the remaining oil tea trees, with a usage amount of 0.75 kg / tree.

[0047] (4) Post-management: Dig trenches on the outer edge of the oil tea tree canopy and apply fertilizer, applying 0.25 kg of nitrogen fertilizer per tree. Spray 50% carbendazim every half month from April to July each year to control pests and diseases.

[0048] Embodiment 3:

[0049] Preparation of Rejuvenating Agent A:

[0050] 1.2 g of polyaspartic acid was added to 150 mL of water and stirred evenly to obtain a polyaspartic acid solution, and then the solution was heated to 80°C, 4 g of carrageenan was added, mixed evenly and cooled to room temperature, 8 g of calcium peroxide of about 0.2 mm and 0.8 g of sophora biosurfactant were added and stirred evenly to obtain gel A, and then gel A was frozen at -5°C for 50 min and crushed to obtain a rejuvenation agent A of about 0.2 cm.

[0051] Preparation of rejuvenation agent B:

[0052] Add 2 g of sodium trimetaphosphate to 150 mL of water and stir well to obtain a sodium trimetaphosphate solution. Then add 1.2 g of sodium metasilicate and 1.2 g of phosphatidylcholine to the sodium trimetaphosphate solution. After mixing well, add 3 g of sodium alginate and 3 g of gelatin to obtain solution B. Add the solution dropwise into a 10 wt % calcium chloride solution to obtain gel particles. Dry the solution at 30° C. for 1 h to obtain a rejuvenation agent B.

[0053] Methods for tending and rejuvenation of low-yield camellia forests:

[0054] (1) Forest clearing: remove vines and weeds from the oil tea forest and break up the soil clumps;

[0055] (2) Thinning and pruning: Keep the oil tea trees with good varieties and good growth for cultivation, and remove all the other varieties that are not suitable for growth and have poor growth. In the sparse areas, select excellent varieties for replanting, so that the planting density of the oil tea forest after thinning is 74 trees / mu. At the same time, remove some large, excessive and dense branches, and cut back some weak branches, dead branches, diseased and insect-infested branches;

[0056] (3) Application of rejuvenation agent: Apply rejuvenation agent B at 30 cm downward from the soil within 25 cm around all oil tea trees, with the amount used being 1 kg / tree. Then apply rejuvenation agent A at 20 cm downward from the soil within 25 cm around the remaining oil tea trees, with the amount used being 1 kg / tree.

[0057] (4) Post-management: Dig trenches on the outer edge of the oil tea tree canopy and apply fertilizer, applying 0.3 kg of nitrogen fertilizer per tree. Spray 50% carbendazim every half month from April to July each year to control pests and diseases.

[0058] Comparative Example 1:

[0059] This comparative example is in contrast to Example 1, the only difference being that only rejuvenation agent A is used for treatment, while the newly planted trees are treated with rejuvenation agent B, and the specific method is as follows:

[0060] (1) Forest clearing: remove vines and weeds from the oil tea forest and break up the soil clumps;

[0061] (2) Thinning and pruning: Keep the oil tea trees with good varieties and good growth for cultivation, and remove all the other varieties that are not suitable for growth and have poor growth. In the sparse areas, select excellent varieties for replanting, so that the planting density of the oil tea forest after thinning is 55 trees / mu. At the same time, remove some large, excessive and dense branches, and cut back some weak branches, dead branches, diseased and insect-infested branches;

[0062] (3) Application of rejuvenation agent: Apply rejuvenation agent A at 15 cm below the soil within 20 cm around the preserved tea oil trees, with the amount used being 0.5 kg / tree. For newly planted tea oil trees, apply rejuvenation agent B at 25 cm below the soil, with the amount used being 0.5 kg / tree.

[0063] (4) Post-management: Dig trenches on the outer edge of the oil tea tree canopy and apply fertilizer, applying 0.2 kg of nitrogen fertilizer per tree. Spray 50% carbendazim every half month from April to July each year to control diseases and insect pests.

[0064] The preparation of the rejuvenation agent A in this comparative example is the same as that in Example 1.

[0065] Comparative Example 2:

[0066] This comparative example is in contrast to Example 1, the only difference being that only rejuvenation agent B is used for treatment, and the specific method is as follows:

[0067] (1) Forest clearing: remove vines and weeds from the oil tea forest and break up the soil clumps;

[0068] (2) Thinning and pruning: Keep the oil tea trees with good varieties and good growth for cultivation, and remove all the other varieties that are not suitable for growth and have poor growth. In the sparse areas, select excellent varieties for replanting, so that the planting density of the oil tea forest after thinning is 55 trees / mu. At the same time, remove some large, excessive and dense branches, and cut back some weak branches, dead branches, diseased and insect-infested branches;

[0069] (3) Application of rejuvenation agent: Apply rejuvenation agent B 25 cm below the soil within 20 cm around all oil tea trees, with the amount used being 0.5 kg / tree.

[0070] (4) Post-management: Dig trenches on the outer edge of the oil tea tree canopy and apply fertilizer, applying 0.2 kg of nitrogen fertilizer per tree. Spray 50% carbendazim every half month from April to July each year to control diseases and insect pests.

[0071] The preparation of the rejuvenation agent B in this comparative example is the same as that in Example 1.

[0072] Comparative Example 3:

[0073] This comparative example is in contrast to Example 1, the only difference being that the raw materials of the rejuvenation agent A are different, specifically, no polyaspartic acid is added, and the specific method is as follows:

[0074] 4 g of carrageenan was added to 120 mL of 70°C water, mixed well and cooled to room temperature, 6 g of calcium peroxide of about 0.1 mm and 0.6 g of sophora biosurfactant were added and stirred well to obtain gel A, and then gel A was frozen at -10°C for 40 min and crushed to obtain rejuvenation agent A of about 0.1 cm.

[0075] Comparative Example 4:

[0076] This comparative example is in contrast to Example 1, the only difference being that the raw materials of the rejuvenation agent B are different, specifically, no sophorolipid is added, and the specific method is as follows:

[0077] 1 g of polyaspartic acid was added to 120 mL of water and stirred to obtain a polyaspartic acid solution. The solution was then heated to 70°C, 4 g of carrageenan was added, the mixture was mixed and then cooled to room temperature. 6 g of calcium peroxide of about 0.1 mm was added and stirred to obtain gel A. The gel A was then frozen at -10°C for 40 min and crushed to obtain a rejuvenation agent A of about 0.1 cm.

[0078] Comparative Example 5:

[0079] This comparative example is in contrast to Example 1, the only difference being that the raw materials for preparing the rejuvenation agent B are different, specifically, sodium trimetaphosphate and sodium metasilicate are not added, and the specific method is as follows:

[0080] After 0.8 g of phosphatidylcholine was evenly mixed with 100 mL of water, 2 g of sodium alginate and 2 g of gelatin were added to obtain solution B, which was then dropped into a 10 wt % calcium chloride solution to obtain gel particles, which were dried at 20° C. for 1 h to obtain a rejuvenation agent B.

[0081] Comparative Example 6:

[0082] This comparative example is in contrast to Example 1, the only difference being that the raw materials for preparing the rejuvenation agent B are different, specifically, phosphatidylcholine is not added, and the specific method is as follows:

[0083] 1.5 g of sodium trimetaphosphate was added to 100 mL of water, and the mixture was stirred to obtain a sodium trimetaphosphate solution. Subsequently, 1 g of sodium metasilicate was added to the sodium trimetaphosphate solution, and after mixing, 2 g of sodium alginate and 2 g of gelatin were added to obtain a solution B, which was dropped into a 10 wt % calcium chloride solution to obtain gel particles, which were dried at 20° C. for 1 h to obtain a rejuvenation agent B.

[0084] Comparative Example 7:

[0085] This comparative example is in contrast to Example 1, except that no rejuvenation agent is applied. The specific method is as follows:

[0086] (1) Forest clearing: remove vines and weeds from the oil tea forest and break up the soil clumps;

[0087] (2) Thinning and pruning: Keep the oil tea trees with good varieties and good growth for cultivation, and remove all the other varieties that are not suitable for growth and have poor growth. In the sparse areas, select excellent varieties for replanting, so that the planting density of the oil tea forest after thinning is 55 trees / mu. At the same time, remove some large, excessive and dense branches, and cut back some weak branches, dead branches, diseased and insect-infested branches;

[0088] (3) Post-management: Dig trenches on the outer edge of the oil tea tree canopy and apply fertilizer, applying 0.2 kg of nitrogen fertilizer per tree. Spray 50% carbendazim every half month from April to July each year to control pests and diseases.

[0089] Comparative Example 8:

[0090] This comparative example is in contrast to Example 1, except that no oil-tea replanting is performed and no rejuvenation agent is applied. The specific method is as follows:

[0091] (1) Forest clearing: remove vines and weeds from the oil tea forest and break up the soil clumps;

[0092] (2) Pruning: Keep the tea trees with good varieties and good growth for nurturing, and remove all the other varieties that are not suitable for the growth and poor growth. At the same time, remove some large, excessive and dense branches, and cut back some weak branches, dead branches, diseased and insect-infested branches;

[0093] (3) Application of rejuvenation agent: Apply rejuvenation agent B 25 cm downward from the soil within 20 cm around all oil tea trees, with the amount used being 0.5 kg / tree. Then apply rejuvenation agent A 15 cm downward from the soil within 20 cm around the remaining oil tea trees, with the amount used being 0.5 kg / tree.

[0094] (4) Post-management: Dig trenches on the outer edge of the oil tea tree canopy and apply fertilizer, applying 0.2 kg of nitrogen fertilizer per tree. Spray 50% carbendazim every half month from April to July each year to control diseases and insect pests.

[0095] experiment:

[0096] In March 2023, the vines and weeds in the low-yield tea oil forest were cleared, and the tea oil trees with good varieties and good growth were retained for cultivation. The rest of the varieties that were not suitable and had poor growth were all dug out. At the same time, in sparse areas, Changlin No. 4 tea oil trees were selected for replanting. The planting density of the tea oil forest after dense replanting was 55 plants / mu. Some larger, excessive and dense branches were removed, and some weak branches, dead branches, and diseased and insect-infested branches were pruned back. Three retained tea oil trees were randomly selected as a group, and three groups were repeated. Rejuvenating agent A and rejuvenating agent B were applied within 20cm of the soil around the tea oil tree. The usage was 0.5kg / plant, and the rejuvenating agent B was applied 25cm below the soil, and the rejuvenating agent A was applied 15cm below the soil. The prepared rejuvenation agent A and rejuvenation agent B were added to Example 1 and Comparative Examples 3-6 respectively, Comparative Example 1 used the rejuvenation agent A prepared in Example 1, Comparative Example 2 used the rejuvenation agent B prepared in Example 1, Comparative Example 7 did not apply the rejuvenation agent, and Comparative Example 8 did not perform replanting and did not apply the rejuvenation agent.

[0097] In the later stage of management of the tea oil trees, dig trenches on the outer edge of the tree crown and apply fertilizer, apply 0.2kg of nitrogen fertilizer per tree, and spray 50% carbendazim every half month from April to July each year to control diseases and pests.

[0098] The plant height of each experimental group of tea oil trees was measured. 50 days after the rejuvenation agent was applied, the soil Ph was tested using a soil Ph meter, and the plant height was measured again to calculate the change in plant height. When the tea oil trees were harvested, the fruit yield per plant was counted (last year's fruit yield per plant was 0.95 kg), and the results were averaged. The results are shown in Table 1:

[0099] Table 1

[0100]

[0101]

[0102] Analyzing Table 1, we can get:

[0103] 1. Comparative Example 1 Compared with Example 1, only the rejuvenation agent A is used. After the rejuvenation agent A is decomposed, calcium peroxide enters the soil and decomposes to generate oxygen, which can promote the respiration of the root system of the oil tea tree. However, the oil tea absorbs too much calcium ions, which affects its growth rate, resulting in a low change in plant height in Comparative Example 1 and a decrease in the yield of a single oil tea plant. In Comparative Example 5, sodium trimetaphosphate and sodium metasilicate are not added, and the excess calcium ions generated after the action of the rejuvenation agent A cannot be effectively processed, resulting in the oil tea absorbing too much calcium ions, affecting the growth of the oil tea, and also resulting in a decrease in the oil tea yield.

[0104] 2. Compared with Example 1, in Comparative Example 2, only rejuvenation agent B is used. Rejuvenating agent B can improve soil fertility, promote the growth of camellia oleifera, and increase the yield of camellia oleifera to a certain extent. However, the retained camellia oleifera roots have low activity and absorb water and nutrients at a low rate, resulting in a lower yield of camellia oleifera in Comparative Example 2.

[0105] 3. In comparative example 3, polyaspartic acid was not added, and the decomposition rate of the rejuvenation agent A was slow, because polyaspartic acid could attract microorganisms in the soil to gather, thereby promoting the decomposition of the rejuvenation agent A; in comparative example 4, sophorolipid was not added, and the decomposition rate of the rejuvenation agent A was slow, because sophorolipid could promote the decomposition of carrageenan molecules in the rejuvenation agent A. Since the decomposition of the rejuvenation agent A in comparative examples 3 and 4 was slow, the promotion effect of the rejuvenation agent A on the root vitality of the oil-tea camellia was low, resulting in a low growth promotion efficiency for the oil-tea camellia, a low rate of change in plant height, and a low oil-tea camellia yield.

[0106] 4. In Comparative Example 6, no phosphatidylcholine was added, and the decomposition rate of the rejuvenation agent B was faster. The release rate of the effective ingredients sodium trimetaphosphate and sodium metasilicate in the rejuvenation agent B was too fast and was absorbed by the roots of the oil-tea camellia, resulting in a decrease in the treatment efficiency of the calcium ions produced by the rejuvenation agent A, thereby resulting in a lower yield of the oil-tea camellia.

[0107] 5. In Comparative Example 7, no rejuvenation agent was applied, the air permeability of the soil was poor, and the oil tea itself declined, the root activity was poor, resulting in reduced root respiration, affected root growth, and reduced yield. In Comparative Example 8, the oil tea trees with poor growth were dug out but no oil tea replanting was performed, and no rejuvenation agent was applied. The yield of oil tea was low, but because no replanting was performed, there were fewer trees competing for nutrients with the retained oil tea trees, which resulted in a slightly higher single-plant yield in Comparative Example 8 than in Comparative Example 7, but no replanting would result in a reduction in the total yield of oil tea.

[0108] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention. The techniques, shapes, and structural parts not described in detail in the present invention are all known technologies.

Claims

1. A method for tending and rejuvenating low-yield camellia oleifera forests, characterized in that: The method comprises the following steps: (1) Forest clearing: remove vines and weeds from the oil tea forest and break up the soil clumps; (2) Thinning and pruning: Keep the oil tea trees with good varieties and good growth and cultivate them, remove all the other varieties that are not suitable for growth and have poor growth, and select high-quality varieties to replant in sparse areas, and prune the oil tea trees at the same time; (3) Application of rejuvenation agent: Apply rejuvenation agent A and / or rejuvenation agent B to the soil around the oil tea tree; (4) Post-management: water, fertilizer, disease and pest management for oil tea.

2. The method for tending and rejuvenating a low-yield camellia oleifera forest according to claim 1, characterized in that: The planting density of the oil tea forest after the intermediate dense planting in step (1) is 55-74 plants / mu.

3. The method for tending and rejuvenating a low-yield camellia oleifera forest according to claim 2, characterized in that: The preparation method of the rejuvenation agent A is as follows: Add polyaspartic acid to water and stir evenly to obtain a polyaspartic acid solution, then heat the solution to 70-80°C, add carrageenan, mix evenly and cool to room temperature, add calcium peroxide and sophorolipids and stir evenly to obtain gel A, then freeze gel A at -10 to -5°C for 40-50 minutes and crush to obtain rejuvenation agent A.

4. The method for tending and rejuvenating a low-yield camellia oleifera forest according to claim 3, characterized in that: The mass ratio of polyaspartic acid, calcium peroxide, sophorolipids and carrageenan in the rejuvenation agent A is (1-1.2):(6-8):(0.6-0.8):(4-5).

5. The method for tending and rejuvenating a low-yield camellia oleifera forest according to claim 4, characterized in that: The particle size of the calcium peroxide is 0.1-0.2 mm, and the particle size of the rejuvenation agent A is 0.1-0.2 cm.

6. The method for tending and rejuvenating a low-yield camellia oleifera forest according to claim 5, characterized in that: The preparation method of the rejuvenation agent B is as follows: Sodium trimetaphosphate is added to water and stirred to obtain a sodium trimetaphosphate solution. Then, sodium metasilicate and phosphatidylcholine are added to the sodium trimetaphosphate solution. After mixing, sodium alginate and gelatin are added to obtain solution B. Solution B is dropped into a 10wt% calcium chloride solution to obtain gel particles. After drying at 20-30°C for 1-2h, a rejuvenation agent B is obtained.

7. The method for tending and rejuvenating a low-yield camellia oleifera forest according to claim 6, characterized in that: The mass ratio of sodium trimetaphosphate, sodium metasilicate, phosphatidylcholine, sodium alginate and gelatin in the rejuvenation agent B is (1.5-2):(1-1.2):(0.8-1.2):(2-3):(2-3).

8. The method for tending and rejuvenating a low-yield camellia oleifera forest according to claim 7, characterized in that: The particle size of the rejuvenation agent B is 0.1-0.2 cm.

9. The method for tending and rejuvenating a low-yield camellia oleifera forest according to claim 8, characterized in that: The method of using the rejuvenation agent A and the rejuvenation agent B in the step (4) is: applying the rejuvenation agent A and / or the rejuvenation agent B within a range of 20-30 cm around the oil tea tree, specifically applying the rejuvenation agent A and the rejuvenation agent B to the retained oil tea trees, and only applying the rejuvenation agent B to the newly planted trees.

10. The method for tending and rejuvenating a low-yield camellia oleifera forest according to claim 9, characterized in that: The rejuvenation agent A is applied at 15-20 cm below the soil, and the amount used is 0.5-1 kg / plant. The rejuvenation agent B is applied at 25-30 cm below the soil, and the amount used is 0.5-1 kg / plant.

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