A method for tending and rejuvenating low-yield camellia oleifera forests

Abstract

This invention discloses a method for tending and rejuvenating low-yield camellia forests, belonging to the field of camellia planting and management technology. The method includes the following steps: (1) Forest clearing: remove vines and weeds from the camellia forest and break up the clumps of soil; (2) Thinning and pruning: retain camellia trees of good varieties and with good growth for tending, remove all other varieties that are not suitable for growth and have poor growth, and select superior varieties for replanting in sparse areas, while pruning the camellia trees; (3) Application of rejuvenation agents: apply rejuvenation agent A and / or rejuvenation agent B to the soil around the camellia trees; (4) Post-management: manage water and fertilizer and pests and diseases of the camellia, which solves the problem of poor tending and rejuvenation effect of low-yield camellia forests.

Description

Technical Field

[0001] This invention relates to the field of Camellia oleifera planting and management technology, and in particular to a method for tending and rejuvenating low-yield Camellia oleifera forests. Background Technology

[0002] Camellia oleifera Abel, belonging to the genus Camellia in the family Theaceae, is an evergreen small tree or shrub, an economically valuable forest species with a wide adaptability and high economic value. It is one of my country's major woody oilseed tree species. Camellia oil, made from camellia oleifera, is rich in nutrients, including oleic acid and linoleic acid, and has a mellow aroma, making it a high-quality edible oil. It is also an excellent industrial raw material, used in soap making, cosmetics, rubber, and other industries. Low-yield camellia oleifera forests refer to those with an average annual oil yield of less than 150 kg / hm². 2 The current low yield of camellia oleifera forests is mainly due to factors such as forest land abandonment, mixed planting of camellia oleifera varieties, and extensive and poor management. Therefore, how to transform low-yield camellia oleifera forests and promote the high-quality development of the camellia oleifera industry is an urgent problem to be solved. Current methods for rejuvenating and transforming camellia oleifera forests mainly involve strengthening tending and management, including forest land clearing, thinning and replanting, and pruning and shaping. However, these methods are slow to take effect and have poor transformation results. This is mainly because of the decline of the trees themselves and poor soil conditions that affect root growth.

[0003] Therefore, this invention provides a method for tending and rejuvenating low-yield camellia forests, which rejuvenates and transforms low-yield camellia forests to increase their yield. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide a method for tending and rejuvenating low-yield Camellia oleifera forests, thereby solving the problem of poor tending and rejuvenation effects in low-yield Camellia oleifera forests.

[0005] The present invention solves the above-mentioned technical problems through the following technical means:

[0006] (1) Forest clearing: Remove vines and weeds from the camellia oleifera forest and break up the clumps of soil;

[0007] (2) Replenishing dense and sparse areas and pruning: Retain good varieties and grow well for cultivation, and dig up all other varieties that are not suitable for growth and have poor growth. At the same time, select excellent varieties to replant in sparse areas, and prune some of the larger, excessive and dense branches, and prune back some weak branches, dead branches, diseased and insect-infested branches.

[0008] (3) Application of rejuvenation agents: Apply rejuvenation agent A and / or rejuvenation agent B to the soil around the camellia trees;

[0009] (4) Post-planting management: Apply fertilizer by digging trenches along the outer edge of the camellia tree canopy, with 30-50 kg / mu of nitrogen fertilizer. Spray 1% Bordeaux mixture or 50% carbendazim regularly from April to July each year to prevent and control pests and diseases.

[0010] Furthermore, the planting density of the camellia oleifera forest after the intermediate dense-to-sparse filling in step (3) is 55-74 trees / acre.

[0011] By thinning out dense areas and planting in sparse areas, the overall density of the camellia oleifera forest can be reduced. At the same time, replanting in sparse areas makes the structure of the camellia oleifera forest more reasonable and improves the overall production potential. In addition, combined with pruning and shaping, the light in the camellia oleifera forest can be increased, promoting photosynthesis of the camellia oleifera trees, improving the light energy utilization rate, improving the ventilation conditions in the camellia oleifera forest, and reducing the occurrence of diseases and pests.

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

[0013] Polyaspartic acid was added to water and stirred until homogeneous to obtain a polyaspartic acid solution. The solution was then heated to 70-80℃, carrageenan was added, and the mixture was cooled to room temperature. Calcium peroxide and sophorolipid were added and stirred until homogeneous to obtain gel A. Gel A was then frozen at -10 to -5℃ for 40-50 minutes and pulverized to obtain rejuvenating agent A.

[0014] Furthermore, the mass ratio of polyaspartic acid, calcium peroxide, sophorolipid, and carrageenan in the rejuvenating 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 rejuvenating agent A is 0.1-0.2 cm.

[0016] Furthermore, the preparation method of the rejuvenating agent B is as follows:

[0017] Sodium trimetaphosphate was added to water and stirred until homogeneous to obtain a sodium trimetaphosphate solution. Sodium metasilicate and phosphatidylcholine were then added to the sodium trimetaphosphate solution and mixed until homogeneous. Sodium alginate and gelatin were then added to obtain solution B. This solution was then added dropwise to a 10wt% calcium chloride solution to obtain gel particles. These particles were then dried at 20-30℃ for 1-2 hours to obtain rejuvenating agent B.

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

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

[0020] Furthermore, the method of using rejuvenation agent A and rejuvenation agent B in step (4) is as follows: apply rejuvenation agent A and / or rejuvenation agent B within a range of 20-30cm around the camellia tree. Specifically, apply rejuvenation agent A and rejuvenation agent B to the preserved camellia trees, and apply rejuvenation agent B only to the newly planted trees.

[0021] Furthermore, the rejuvenation agent A is applied at a depth of 15-20 cm in the soil at a rate of 0.5-1 kg / plant, and the rejuvenation agent B is applied at a depth of 25-30 cm in the soil at a rate of 0.5-1 kg / plant.

[0022] A rejuvenation agent was applied around the camellia trees. Rejuvenator A and Rejuvenator B were applied to existing camellia trees, while newly planted trees received only Rejuvenator B. Rejuvenator A contains calcium peroxide, which slowly decomposes in the soil to generate oxygen. Therefore, Rejuvenator A can continuously provide oxygen to the camellia roots, promoting root respiration, increasing root vitality, and thus promoting camellia growth. Simultaneously, Rejuvenator A contains polyaspartic acid as a carbon source, which attracts soil microorganisms to gather at Rejuvenator A and increases their activity. The gathered microorganisms can quickly decompose Rejuvenator A. Rejuvenator A also contains sophorolipids, which can inhibit the aggregation of carrageenan molecules, reducing the interaction forces between carrageenan molecules in Rejuvenator A, making the gel structure formed by carrageenan looser, thereby promoting the decomposition of Rejuvenator A and enhancing its effect on improving the vitality of camellia roots.

[0023] However, excessive calcium ion absorption by Camellia oleifera can lead to slow growth, sparse leaves, yellowing, and wilting. Therefore, while using Rejuvenator A, Rejuvenator B should be applied below it. The calcium ions produced by Rejuvenator A migrate downwards and complex with sodium trimetaphosphate and sodium metasilicate contained in Rejuvenator B, thereby reducing the impact of calcium ions on the soil. Rejuvenator B also contains a certain amount of phosphatidylcholine, which interacts with gelatin molecules, enhancing the cross-linking of the gelatin's three-dimensional structure and forming a stable cross-linked structure. This allows Rejuvenator B to slowly release the effective components sodium trimetaphosphate and sodium metasilicate, preventing them from being absorbed too quickly by the Camellia oleifera roots, thus ensuring the effective treatment of the calcium ions produced by Rejuvenator A. Simultaneously, the sodium trimetaphosphate and sodium metasilicate in Rejuvenator B can also serve as fertilizer in the soil, continuing to provide nutrients for the growth of Camellia oleifera and promoting its growth. This also prevents Rejuvenator B from decomposing too quickly and causing root burn to newly transplanted Camellia oleifera roots.

[0024] Beneficial effects:

[0025] This invention combines traditional methods for transforming low-yield camellia oleifera forests by applying a rejuvenation agent around the camellia trees, which effectively promotes the growth of camellia oleifera and improves the current situation of low-yield camellia oleifera forests. This invention not only increases the yield of camellia oleifera forests to meet the increasing market demand for camellia oleifera and promote the high-quality development of the camellia oleifera industry, but also reduces labor costs, effectively promoting forestry efficiency and increasing farmers' income. Attached Figure Description

[0026] Figure 1 A picture of a camellia oleifera forest after it has been nurtured and rejuvenated. Detailed Implementation

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

[0028] Example 1:

[0029] Preparation of rejuvenating agent A:

[0030] 1g of polyaspartic acid was added to 120mL of water and stirred until homogeneous to obtain a polyaspartic acid solution. The solution was then heated to 70℃, 4g of carrageenan was added, and after mixing evenly, it was cooled to room temperature. 6g of calcium peroxide (approximately 0.1mm) and 0.6g of sophorolipid were added and stirred evenly to obtain gel A. Gel A was then frozen at -10℃ for 40min and pulverized to obtain a rejuvenating agent A (approximately 0.1cm).

[0031] Preparation of Rejuvenating Agent B:

[0032] 1.5g of sodium trimetaphosphate was added to 100mL of water and stirred until homogeneous to obtain a sodium trimetaphosphate solution. Then, 1g of sodium metasilicate and 0.8g of phosphatidylcholine were added to the sodium trimetaphosphate solution and mixed until homogeneous. 2g of sodium alginate and 2g of gelatin were added to obtain solution B. This solution was then added dropwise to a 10wt% calcium chloride solution to obtain gel particles. After drying at 20℃ for 1h, the rejuvenating agent B was obtained.

[0033] Methods for tending and rejuvenating low-yield Camellia oleifera forests:

[0034] (1) Forest clearing: Remove vines and weeds from the camellia oleifera forest and break up the clumps of soil;

[0035] (2) Replenishing dense areas and pruning: Retain good varieties and strong growth of camellia trees for cultivation, and remove all other varieties that are not suitable for growth and have poor growth. In sparse areas, select superior varieties for replanting so that the planting density of camellia forest after replenishment is 55 trees / acre. At the same time, prune some larger, excessive and dense branches, and prune back some weak branches, dead branches, diseased and insect-infested branches.

[0036] (3) Application of rejuvenation agent: Apply rejuvenation agent B to all tea trees at a depth of 25cm below the soil within a 20cm radius around the tea tree, at a rate of 0.5kg / tree. Then apply rejuvenation agent A to the remaining tea trees at a depth of 15cm below the soil within a 20cm radius around the remaining tea trees, at a rate of 0.5kg / tree.

[0037] (4) Post-planting management: Apply fertilizer by digging a trench along the outer edge of the camellia tree canopy, with 0.2 kg of nitrogen fertilizer per tree. Spray 50% carbendazim every half month from April to July each year to prevent and control pests and diseases.

[0038] Example 2:

[0039] Preparation of rejuvenating agent A:

[0040] 1.1g of polyaspartic acid was added to 135mL of water and stirred until homogeneous to obtain a polyaspartic acid solution. The solution was then heated to 75℃, and 4.5g of carrageenan was added. After mixing evenly, the mixture was cooled to room temperature. 7g of calcium peroxide (approximately 0.15mm) and 0.7g of sophorolipid were added and stirred evenly to obtain gel A. Gel A was then frozen at -8℃ for 45min and pulverized to obtain a rejuvenating agent A (approximately 0.15cm).

[0041] Preparation of Rejuvenating Agent B:

[0042] 1.75g ​​of sodium trimetaphosphate was added to 125mL of water and stirred until homogeneous to obtain a sodium trimetaphosphate solution. Then, 1.1g of sodium metasilicate and 1g of phosphatidylcholine were added to the sodium trimetaphosphate solution and mixed until homogeneous. 2.5g of sodium alginate and 2.5g of gelatin were then added to obtain solution B. This solution was then added dropwise to a 10wt% calcium chloride solution to obtain gel particles. These particles were dried at 25℃ for 1.5h to obtain rejuvenating agent B.

[0043] Methods for tending and rejuvenating low-yield Camellia oleifera forests:

[0044] (1) Forest clearing: Remove vines and weeds from the camellia oleifera forest and break up the clumps of soil;

[0045] (2) Replenishing dense areas and pruning: Retain good varieties and strong growth of camellia trees for cultivation, and remove all other varieties that are not suitable for growth and have poor growth. In sparse areas, select superior varieties for replanting so that the planting density of camellia forest after replenishment is 65 trees / acre. At the same time, prune some larger, excessive and dense branches, and prune back some weak, dead, diseased and insect-infested branches.

[0046] (3) Application of rejuvenation agent: Apply rejuvenation agent B to all camellia trees at a depth of 28cm below the soil around the camellia tree at a depth of 23cm, and apply rejuvenation agent A to the remaining camellia trees at a depth of 18cm below the soil around the remaining camellia trees at a depth of 23cm, and apply rejuvenation agent A at a depth of 0.75kg / tree.

[0047] (4) Post-planting management: Apply fertilizer by digging a trench along the outer edge of the camellia tree canopy, with 0.25 kg of nitrogen fertilizer per tree. Spray 50% carbendazim every half month from April to July each year to prevent and control pests and diseases.

[0048] Example 3:

[0049] Preparation of rejuvenating agent A:

[0050] 1.2g of polyaspartic acid was added to 150mL of water and stirred until homogeneous to obtain a polyaspartic acid solution. The solution was then heated to 80℃, 4g of carrageenan was added, and after mixing evenly, it was cooled to room temperature. 8g of calcium peroxide (approximately 0.2mm) and 0.8g of sophorolipid were added and stirred evenly to obtain gel A. Gel A was then frozen at -5℃ for 50min and pulverized to obtain a rejuvenating agent A (approximately 0.2cm).

[0051] Preparation of Rejuvenating Agent B:

[0052] 2g of sodium trimetaphosphate was added to 150mL of water and stirred until homogeneous to obtain a sodium trimetaphosphate solution. Then, 1.2g of sodium metasilicate and 1.2g of phosphatidylcholine were added to the sodium trimetaphosphate solution and mixed until homogeneous. 3g of sodium alginate and 3g of gelatin were added to obtain solution B. This solution was then added dropwise to a 10wt% calcium chloride solution to obtain gel particles. After drying at 30℃ for 1h, the rejuvenating agent B was obtained.

[0053] Methods for tending and rejuvenating low-yield Camellia oleifera forests:

[0054] (1) Forest clearing: Remove vines and weeds from the camellia oleifera forest and break up the clumps of soil;

[0055] (2) Replenishing dense areas and pruning: Retain good varieties and strong growth of camellia trees for cultivation, and remove all other varieties that are not suitable for growth and have poor growth. In sparse areas, select superior varieties for replanting so that the planting density of camellia forest after replenishment is 74 trees / acre. At the same time, prune some larger, excessive and dense branches, and prune back some weak branches, dead branches, diseased and insect-infested branches.

[0056] (3) Application of rejuvenation agent: Apply rejuvenation agent B to the soil 30cm down within a 25cm radius around all the camellia trees, at a rate of 1kg / tree. Then apply rejuvenation agent A to the soil 20cm down within a 25cm radius around the remaining camellia trees, at a rate of 1kg / tree.

[0057] (4) Post-planting management: Apply fertilizer by digging a trench along the outer edge of the camellia tree canopy, with 0.3 kg of nitrogen fertilizer per tree. Spray 50% carbendazim every half month from April to July each year to prevent and control pests and diseases.

[0058] Comparative Example 1:

[0059] This comparative example is compared with Example 1, the only difference being that only rejuvenation agent A was used for treatment, while the newly planted trees were treated with rejuvenation agent B. The specific method is as follows:

[0060] (1) Forest clearing: Remove vines and weeds from the camellia oleifera forest and break up the clumps of soil;

[0061] (2) Replenishing dense areas and pruning: Retain good varieties and strong growth of camellia trees for cultivation, and remove all other varieties that are not suitable for growth and have poor growth. In sparse areas, select superior varieties for replanting so that the planting density of camellia forest after replenishment is 55 trees / acre. At the same time, prune some larger, excessive and dense branches, and prune back some weak branches, dead branches, diseased and insect-infested branches.

[0062] (3) Application of rejuvenation agent: Apply rejuvenation agent A to the soil 15cm below the soil within a 20cm radius around the preserved camellia trees, at a rate of 0.5kg / tree. Apply rejuvenation agent B to the newly planted camellia trees at a depth of 25cm below the soil, at a rate of 0.5kg / tree.

[0063] (4) Post-planting management: Apply fertilizer by digging a trench along the outer edge of the camellia tree canopy, with 0.2 kg of nitrogen fertilizer per tree. Spray 50% carbendazim every half month from April to July each year to prevent and control pests and diseases.

[0064] In this comparative example, the preparation of the rejuvenating agent A is the same as in Example 1.

[0065] Comparative Example 2:

[0066] This comparative example is compared with Example 1, the only difference being that only the rejuvenating agent B was used for treatment, and the specific method is as follows:

[0067] (1) Forest clearing: Remove vines and weeds from the camellia oleifera forest and break up the clumps of soil;

[0068] (2) Replenishing dense areas and pruning: Retain good varieties and strong growth of camellia trees for cultivation, and remove all other varieties that are not suitable for growth and have poor growth. In sparse areas, select superior varieties for replanting so that the planting density of camellia forest after replenishment is 55 trees / acre. At the same time, prune some larger, excessive and dense branches, and prune back some weak branches, dead branches, diseased and insect-infested branches.

[0069] (3) Application of rejuvenation agent: Apply rejuvenation agent B to the soil 25cm down within a 20cm radius around all camellia trees, at a rate of 0.5kg / tree.

[0070] (4) Post-planting management: Apply fertilizer by digging a trench along the outer edge of the camellia tree canopy, with 0.2 kg of nitrogen fertilizer per tree. Spray 50% carbendazim every half month from April to July each year to prevent and control pests and diseases.

[0071] In this comparative example, the preparation of the rejuvenating agent B is the same as in Example 1.

[0072] Comparative Example 3:

[0073] This comparative example is compared with Example 1, the only difference being the raw material of the rejuvenating agent A. Specifically, polyaspartic acid is not added. The specific method is as follows:

[0074] Add 4g of carrageenan to 120mL of water at 70℃, mix well, and cool to room temperature. Add 6g of calcium peroxide (approximately 0.1mm) and 0.6g of sophorolipid and stir well to obtain gel A. Then freeze gel A at -10℃ for 40min and pulverize it to obtain a rejuvenating agent A (approximately 0.1cm).

[0075] Comparative Example 4:

[0076] This comparative example is compared with Example 1, the only difference being the raw material of the rejuvenating agent B, specifically, the absence of sophorolipids. The specific method is as follows:

[0077] 1g of polyaspartic acid was added to 120mL of water and stirred until homogeneous to obtain a polyaspartic acid solution. The solution was then heated to 70℃, 4g of carrageenan was added, and the mixture was cooled to room temperature. 6g of calcium peroxide (approximately 0.1mm) was added and stirred until homogeneous to obtain gel A. Gel A was then frozen at -10℃ for 40min and pulverized to obtain a rejuvenating agent A (approximately 0.1cm).

[0078] Comparative Example 5:

[0079] This comparative example is compared with Example 1, the only difference being the raw materials used to prepare the rejuvenating agent B. Specifically, sodium trimetaphosphate and sodium metasilicate are not added. The specific method is as follows:

[0080] 0.8g of phosphatidylcholine was mixed with 100mL of water, and then 2g of sodium alginate and 2g of gelatin were added to obtain solution B. Solution B was then added dropwise to 10wt% calcium chloride solution to obtain gel particles. After drying at 20℃ for 1h, the rejuvenating agent B was obtained.

[0081] Comparative Example 6:

[0082] This comparative example is compared with Example 1, the only difference being the raw materials used to prepare the revitalizing agent B. Specifically, phosphatidylcholine is not added, and the specific method is as follows:

[0083] 1.5g of sodium trimetaphosphate was added to 100mL of water and stirred until homogeneous to obtain a sodium trimetaphosphate solution. Then, 1g of sodium metasilicate was added to the sodium trimetaphosphate solution and mixed until homogeneous. 2g of sodium alginate and 2g of gelatin were added to obtain solution B. This solution was then added dropwise to a 10wt% calcium chloride solution to obtain gel particles. After drying at 20℃ for 1h, the rejuvenating agent B was obtained.

[0084] Comparative Example 7:

[0085] This comparative example is compared with Example 1, except that no rejuvenating agent is applied. The specific method is as follows:

[0086] (1) Forest clearing: Remove vines and weeds from the camellia oleifera forest and break up the clumps of soil;

[0087] (2) Replenishing dense areas and pruning: Retain good varieties and strong growth of camellia trees for cultivation, and remove all other varieties that are not suitable for growth and have poor growth. In sparse areas, select superior varieties for replanting so that the planting density of camellia forest after replenishment is 55 trees / acre. At the same time, prune some larger, excessive and dense branches, and prune back some weak branches, dead branches, diseased and insect-infested branches.

[0088] (3) Post-planting management: Apply fertilizer by digging a trench along the outer edge of the camellia tree canopy, with 0.2 kg of nitrogen fertilizer per tree. Spray 50% carbendazim every half month from April to July each year to prevent and control pests and diseases.

[0089] Comparative Example 8:

[0090] This comparative example is compared with Example 1, except that no camellia replanting was carried out and no rejuvenation agent was applied. The specific method is as follows:

[0091] (1) Forest clearing: Remove vines and weeds from the camellia oleifera forest and break up the clumps of soil;

[0092] (2) Pruning: Retain good varieties and strong growth of camellia trees for cultivation, and dig up all other varieties that are not suitable for growth and have poor growth. At the same time, prune some of the larger, excessive and dense branches, and prune back some of the weak, dead and diseased branches.

[0093] (3) Application of rejuvenation agent: Apply rejuvenation agent B to all tea trees at a depth of 25cm below the soil within a 20cm radius around the tea tree, at a rate of 0.5kg / tree. Then apply rejuvenation agent A to the remaining tea trees at a depth of 15cm below the soil within a 20cm radius around the remaining tea trees, at a rate of 0.5kg / tree.

[0094] (4) Post-planting management: Apply fertilizer by digging a trench along the outer edge of the camellia tree canopy, with 0.2 kg of nitrogen fertilizer per tree. Spray 50% carbendazim every half month from April to July each year to prevent and control pests and diseases.

[0095] experiment:

[0096] In March 2023, vines and weeds were cleared from the low-yield camellia oleifera forest. Good-quality, vigorous camellia oleifera trees were retained for cultivation, while unsuitable and poorly growing varieties were removed. Simultaneously, in sparse areas, Changlin No. 4 camellia oleifera trees were selected for replanting, resulting in a planting density of 55 trees per acre. Larger, excessive, and overly dense branches were pruned, along with weak, dead, and diseased branches. Three retained camellia oleifera trees were randomly selected as a group, with three replicates. Rejuvenating agents A and B were applied to the soil within a 20cm radius around the camellia oleifera trees. The application rate for both was 0.5kg / tree. Rejuvenating agent B was applied at a depth of 25cm, and rejuvenating agent A at a depth of 15cm. In Examples 1 and Comparative Examples 3-6, the prepared rejuvenation agent A and rejuvenation agent B were added 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 any rejuvenation agent, and Comparative Example 8 did not undergo replanting or apply any rejuvenation agent.

[0097] In the later stages of management, fertilize the camellia trees by digging trenches along the outer edge of the tree canopy, 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 pests and diseases.

[0098] The plant height of Camellia oleifera in each experimental group was measured. Fifty days after the application of the rejuvenation agent, the soil pH was measured using a soil pH meter, and the plant height was measured again. The change in plant height was calculated. At harvest time, the yield per tree was recorded (last year's yield per tree was 0.95 kg), and the average value was taken. The results are shown in Table 1.

[0099] Table 1

[0100]

[0101]

[0102] Analysis of Table 1 yields the following results:

[0103] 1. Compared with Example 1, Comparative Example 1 only used rejuvenation agent A. After rejuvenation agent A decomposed, calcium peroxide entered the soil and decomposed to generate oxygen, which could promote the respiration of the Camellia oleifera roots. However, excessive absorption of calcium ions by the Camellia oleifera would affect its growth rate, resulting in a lower change in plant height and a reduced yield per plant in Comparative Example 1. In contrast, Comparative Example 5 did not add sodium tripolyphosphate or sodium metasilicate. The excessive calcium ions generated after the action of rejuvenation agent A could not be effectively treated, leading to excessive absorption of calcium ions by the Camellia oleifera, which affected its growth and also resulted in a reduced yield.

[0104] 2. Compared with Example 1, Comparative Example 2 only used rejuvenation agent B. Rejuvenating agent B can improve soil fertility, promote the growth of Camellia oleifera, and can increase the yield of Camellia oleifera to a certain extent. However, the remaining Camellia oleifera root system has low activity and a low rate of water and nutrient absorption, resulting in a lower yield of Camellia oleifera in Comparative Example 2.

[0105] 3. In Comparative Example 3, without the addition of polyaspartic acid, the decomposition rate of the rejuvenation agent A was slower. This is because polyaspartic acid can attract the aggregation of microorganisms in the soil, thereby promoting the decomposition of rejuvenation agent A. In Comparative Example 4, without the addition of sophorolipids, the decomposition rate of rejuvenation agent A was also slower. This is because sophorolipids can promote the decomposition of carrageenan molecules in rejuvenation agent A. Due to the slow decomposition of rejuvenation agent A in Comparative Examples 3 and 4, the promoting effect of rejuvenation agent A on the root vitality of Camellia oleifera was low, resulting in a lower efficiency in promoting the growth of Camellia oleifera, a lower rate of change in plant height, and a lower yield of Camellia oleifera.

[0106] 4. In Comparative Example 6, without the addition of phosphatidylcholine, the decomposition rate of the rejuvenating agent B was faster. The release rate of the active ingredients sodium trimetaphosphate and sodium metasilicate in the rejuvenating agent B was too fast, and they were absorbed by the roots of Camellia oleifera. This reduced the treatment efficiency of calcium ions produced by the rejuvenating agent A, resulting in a lower yield of Camellia oleifera.

[0107] 5. In Comparative Example 7, no rejuvenation agent was applied, resulting in poor soil aeration and weakened Camellia oleifera trees with reduced root activity. This led to decreased root respiration and impaired root growth, ultimately reducing yield. In Comparative Example 8, poorly growing Camellia oleifera trees were removed without replanting or applying any rejuvenation agent. While the yield was lower, the lack of replanting meant fewer trees competing for nutrients with the remaining trees, resulting in a slightly higher yield per tree compared to Comparative Example 7. However, the absence of replanting ultimately reduced the total yield of Camellia oleifera.

[0108] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. A method for tending and rejuvenating low-yield camellia oleifera forests, characterized in that, The method includes the following steps: (1) Forest clearing: Remove vines and weeds from the camellia oleifera forest and break up the clumps of soil; (2) Replenishing dense areas and pruning: Retain the good varieties and vigorous growth of camellia trees for cultivation, and remove all other varieties that are not suitable for growth and have poor growth. In sparse areas, select superior varieties for replanting, and prune the camellia trees at the same time. (3) Application of rejuvenation agents: Apply rejuvenation agent A and / or rejuvenation agent B to the soil around the camellia trees; (4) Post-planting management: Water and fertilizer management and pest and disease management for camellia oleifera; The preparation method of the rejuvenation agent A is as follows: Polyaspartic acid was added to water and stirred until homogeneous to obtain a polyaspartic acid solution. The solution was then heated to 70-80℃, carrageenan was added, and the mixture was cooled to room temperature. Calcium peroxide and sophorolipid were added and stirred until homogeneous to obtain gel A. Gel A was then frozen at -10 to -5℃ for 40-50 minutes and pulverized to obtain rejuvenating agent A. The mass ratio of polyaspartic acid, calcium peroxide, sophorolipid, and carrageenan in the rejuvenating agent A is (1-1.2):(6-8):(0.6-0.8):(4-5). The preparation method of the rejuvenation agent B is as follows: Sodium trimetaphosphate was added to water and stirred until homogeneous to obtain a sodium trimetaphosphate solution. Sodium metasilicate and phosphatidylcholine were then added to the sodium trimetaphosphate solution and mixed until homogeneous. Sodium alginate and gelatin were then added to obtain solution B. Solution B was then added dropwise to a 10wt% calcium chloride solution to obtain gel particles. These particles were then dried at 20-30℃ for 1-2 hours to obtain rejuvenating agent B. The mass ratio of sodium trimetaphosphate, sodium metasilicate, phosphatidylcholine, sodium alginate, and gelatin in the rejuvenating agent B is (1.5-2):(1-1.2):(0.8-1.2):(2-3):(2-3). The method of using rejuvenation agent A and rejuvenation agent B in step (3) is as follows: apply rejuvenation agent A and / or rejuvenation agent B within a range of 20-30cm around the camellia tree. Specifically, apply rejuvenation agent A and rejuvenation agent B to the preserved camellia trees, and apply rejuvenation agent B only to the newly planted trees. The rejuvenation agent A is applied at a depth of 15-20 cm in the soil, at a rate of 0.5-1 kg / plant, and the rejuvenation agent B is applied at a depth of 25-30 cm in the soil, at a rate of 0.5-1 kg / plant.

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

3. The method for tending and rejuvenating low-yield camellia forests according to claim 2, characterized in that, The calcium peroxide has a particle size of 0.1-0.2 mm, and the rejuvenating agent A has a particle size of 0.1-0.2 cm.

4. The method for tending and rejuvenating low-yield camellia forests according to claim 3, characterized in that, The particle size of the rejuvenating agent B is 0.1-0.2 cm.

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