A method for promoting nutrient accumulation in Zanthoxylum bungeanum branches and its application

Abstract

The present invention provides a method for promoting nutrient accumulation in branches of Dingtan pepper and its application, belonging to the field of plant planting technology. The method of the present invention includes six steps, including intercropping under the forest, controlling nitrogen fertilizer application, spraying potassium dihydrogen phosphate on the leaves, timely weeding, controlling the number of branches, and applying organic fertilizer. Among them, soybeans are selected for intercropping under the forest; nitrogen fertilizer control refers to the application of high-nitrogen compound fertilizer in the early stage, no heavy nitrogen fertilizer application from May to mid-June, and appropriate application of high-nitrogen compound fertilizer in mid-to-late June; spraying potassium dihydrogen phosphate on the leaves starts from the beginning of August and is sprayed 4-5 times; timely weeding refers to weeding only once between July 20 and August 10; controlling the number of branches from the germination of new buds to the beginning, and finally retaining 60-70 branches; applying organic fertilizer in late September. The method of the present invention can significantly improve the yield and quality of Dingtan pepper; reduce production and operation costs, increase economic income; and at the same time improve the stability of the Dingtan pepper ecosystem.

Description

Technical Field

[0001] The invention belongs to the technical field of plant planting, and in particular relates to a method for promoting nutrient accumulation in Zanthoxylum bungeanum branches and an application thereof. Background Art

[0002] Branches are the link between plant roots and leaves, and are also important organs for transporting water and nutrients and maintaining mechanical support. They can represent the plant's ability to adapt to growth conditions and are greatly affected by factors such as soil, temperature, and moisture. The nutrient accumulation status of branches will, to a certain extent, determine the type, quantity, and quality of flower bud differentiation. The two are closely related, which in turn affects yield and quality, and is considered to be one of the determining factors for increasing output. There are many cases of yield reduction or even total loss due to insufficient branch lignification and insufficient nutrient accumulation, indicating that branch nutrient management is of key significance. Therefore, improving the nutrient content level of branches is an agronomic measure that everyone generally pays attention to.

[0003] Branch nutrient accumulation is inseparable from the entire management technology. It can be said that every scientific and reasonable technical means will promote nutrient accumulation to a certain extent; at the same time, there is a complementary and mutually reinforcing relationship between these technical means. However, how these technical solutions are combined with branch nutrient accumulation is often overlooked, and current methods and means rarely focus on this aspect. In addition, we usually focus on the final results, such as yield and quality, but do not consider the important intermediate process of branch nutrient accumulation, resulting in unclear cause and effect relationships. Therefore, it is difficult to clearly explain the relationship between water, fertilizer, pruning and other measures and yield and quality.

[0004] Dingtan pepper is an economic plant unique to the canyons of the Huajiang Plateau in Guizhou Province, and its cultivation has been gradually expanded. It plays a significant role in ecological restoration and economic development, has made outstanding contributions to the development of mountainous areas, and is a pillar industry for rural revitalization. With the continuous development of the Dingtan pepper industry, technologies such as shaping and pruning, dwarfing and dense planting, and shearing instead of harvesting have been introduced one after another. Therefore, compared with traditional technologies, there have been major changes in water and fertilizer management, pest and disease control, and tree shape shaping. At the same time, the nutrient accumulation process of the branches is also different. As an important mediating process for yield and quality, it is very necessary for us to focus on it. This technology was developed in this context. It can effectively delay the growth decline of Dingtan pepper and aims to provide a technical reference for the sustainable development of the Dingtan pepper industry. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a method for promoting nutrient accumulation in the branches of Dingtan pepper and its application. The method of the present invention includes six links, including intercropping under the forest, controlling nitrogen fertilizer application, spraying potassium dihydrogen phosphate on the leaves, timely weeding, controlling the number of branches and applying organic fertilizer, among which: soybeans are selected for intercropping under the forest; nitrogen fertilizer control refers to the application of high-nitrogen compound fertilizer in the early stage, no heavy nitrogen fertilizer application from May to mid-June, and appropriate application of high-nitrogen compound fertilizer in mid-to-late June; foliar spraying of potassium dihydrogen phosphate starts from the beginning of August and is sprayed 4-5 times; timely weeding refers to weeding only once between July 20 and August 10; controlling the number of branches from the germination of new buds to the beginning, and finally retaining 60-70 branches; applying organic fertilizer in late September. The method of the present invention can significantly improve the yield and quality of Dingtan pepper; reduce production and operation costs, increase economic income; and at the same time improve the stability of the Dingtan pepper ecosystem.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention provides a method for promoting nutrient accumulation in the branches of Zanthoxylum bungeanum, comprising six steps: intercropping under a forest, controlling nitrogen fertilizer application, spraying potassium dihydrogen phosphate on the leaves, timely weeding, controlling the number of branches, and applying organic fertilizer. Each step has a multifaceted beneficial effect, and the present invention primarily describes its relationship to branch nutrient accumulation. The details are as follows:

[0008] (1) Interplanting under the forest: In early April, interplant soybeans under the forest 30-50 cm away from the trunk of the pepper tree, with 600-800 holes per mu and a sowing depth of 5-8 cm.

[0009] The sowing density is lower than that of single sowing. Intercropping can fix nitrogen, loosen the soil, break roots, and reduce weeding. Like other technical methods, intercropping is a yearly cycle and is repeated annually. To highlight the beneficial effect of nitrogen fixation on the growth of Dingtan pepper, we use intercropping as the first step.

[0010] (2) Control the application of nitrogen fertilizer: Apply high-nitrogen compound fertilizer in the early stage, do not apply heavy nitrogen fertilizer from May to mid-June, and apply 0.4-0.6 kg of high-nitrogen compound fertilizer per plant in mid-to-late June.

[0011] Fertilization rates can be adjusted based on tree size. Fertilization during this phase can help encourage branch growth, improve fertilizer efficiency, and reduce waste. To curb excessive branch growth, nitrogen fertilizers are not heavily applied from May to mid-June, and weed control is avoided. Weeds that are too tall are pinned down with sticks. Adhering to the principle of "nitrogen first, phosphorus in the middle, and potassium last," we selected a compound fertilizer with a higher nitrogen content in the early stages to promote vegetative growth.

[0012] (3) Spray potassium dihydrogen phosphate on the leaves: start spraying in early August, 4-5 times in total, with an interval of 15-20 days between each spray.

[0013] (4) Timely weeding: weed once between July 20 and August 10, leaving the grass 5-8 cm high after mowing.

[0014] By creating a competitive relationship between trees and grasses, bud growth is controlled, preventing excessive sprouting and slowing herbaceous growth. From early October to the end of March, weeding is not recommended. If herbaceous growth is excessive, use sticks to flatten it. During this period, herbaceous growth is slow and they are already beginning to rot, so weeding is agronomically wasteful. Herbicide application is strictly prohibited throughout the growing season to prevent irreversible effects on soil microorganisms.

[0015] (5) Control the number of branches: When new buds sprout, leave 100-110 buds, and then leave 80-90 branches. From September 20th to 30th, thin out weak branches, redundant branches, drooping branches, overlapping branches, etc., based on the growth, direction, and space of the branches, and keep the number of branches to 60-70. From December 10th to early January of the following year, cut off the parts of the branches that have not yet turned lignified, and keep the branches to a length of 0.7-1 meter. If the branches are not lignified, there will be no flower buds, and thinning can reduce nutrient waste. Since it is difficult to judge the growth of the branches in the early stage, the last pruning should not be done too early.

[0016] (6) Apply organic fertilizer: In late September, apply organic fertilizer at a rate of 5-10 kg per plant.

[0017] Preferably, the high-nitrogen compound fertilizer applied in step (2) is a high-nitrogen compound fertilizer with N:P:K=22:9:9.

[0018] Preferably, the potassium dihydrogen phosphate in step (3) is used as follows: 0.25-0.3 kg of potassium dihydrogen phosphate is added to 50 kg of tap water and sprayed on 110-130 Zanthoxylum bungeanum trees. The amount of potassium dihydrogen phosphate sprayed can be adjusted according to the tree vigor. Since ground-applied potassium fertilizers are slowly absorbed, foliar spraying of potassium dihydrogen phosphate is preferred.

[0019] More preferably, the tap water is spring water, which can avoid the effects of bleaching agents such as chlorine and alum on plant growth.

[0020] Preferably, in the remaining time of step (4), if the herb grows too vigorously, it is forced to fall over with a wooden stick.

[0021] Preferably, the organic fertilizer in step (6) is fully decomposed cow dung or pig dung.

[0022] Further preferably, the method of applying organic fertilizer in step (6) is: applying fertilizer in furrows along the drip line of the tree canopy, with a fertilizer application depth of 20-30 cm, covering the topsoil after fertilization, and replenishing soil moisture depending on weather conditions.

[0023] The present invention also provides an application of the method for promoting nutrient accumulation in Dingtan Zanthoxylum bungeanum branches in Dingtan Zanthoxylum bungeanum planting.

[0024] Compared with the prior art, the present invention has the following technical effects:

[0025] (1) Improve the yield and quality of Dingtan pepper. By controlling the appropriate number and length of branches, as well as the reasonable time and space distribution, the accumulation of nutrients in the branches can be increased, which is conducive to the transition to reproductive growth and is an important preparatory measure for improving yield and quality. At the same time, this technology greatly reduces nutrient waste, supplying limited nutrients to fruit formation, fruit preservation, and fruit growth, which can also improve yield and quality.

[0026] (2) Reduce production and operation costs and increase economic income. This technology can greatly reduce nutrient waste and give full play to the function of nutrient elements as fertilizer instead of medicine, and better coordinate the nutritional function and physiological function of elements. Therefore, the operating cost is more than 1 times lower than other technologies. At the same time, the improvement of yield and quality brings economic income. Compared with other technologies, it can increase income by 0.5-1.5 times, which can stimulate the enthusiasm of pepper farmers in planting. Therefore, by implementing this technology, the planting income of pepper farmers can be greatly increased.

[0027] (3) Improve the stability of the Dingtan pepper ecosystem. First, due to the reduced use of plant growth regulators, herbicides, pesticides and other drugs, it can better protect soil health and maintain a highly active soil environment. Second, this technology does not use hormone drugs (commonly known as "old drugs"), which reduces the drug residues in the pepper trees and is a key guarantee for cultivating ecological organic products. Finally, this technology coordinates the internal relationship between the various components of the ecosystem and improves the stability of the ecosystem. DETAILED DESCRIPTION

[0028] The following examples are intended to illustrate the present invention but are not intended to limit the scope of the present invention. Modifications or substitutions made to the methods, steps, conditions, instruments, or reagents of the present invention without departing from the spirit and essence of the present invention are intended to fall within the scope of the present invention.

[0029] The technical solution of the present invention is further elaborated in detail below with reference to the embodiments.

[0030] Example 1

[0031] The method for promoting nutrient accumulation in Zanthoxylum bungeanum branches used in this embodiment comprises the following steps:

[0032] (1) Understory interplanting. On April 3, 2021, soybeans were interplanted under the Zanthoxylum bungeanum forest at a distance of 40 cm from the tree trunks, with 600 holes per mu and a sowing depth of 6 cm.

[0033] (2) Control the application of nitrogen fertilizer. On June 18, 2021, after pressing the herbs with wooden sticks, apply high-nitrogen compound fertilizer with N:P:K=22:9:9 (produced by Sichuan Jinxiang Sairui Chemical Co., Ltd.) at a dosage of 0.5 kg / plant. If the crown is small, reduce it as appropriate based on this dosage. Properly increasing the proportion of nitrogen in the early stage can promote branch germination, and nitrogen fertilizer control is more critical in the entire growth process. Since it is almost the picking period, the late summer shoots and autumn shoots that germinate after fertilization can be cultivated as backbone branches and fruit-bearing branches in the following year, and also lay the foundation for the implementation of the side branch rotation pruning method. Therefore, the fertilization time at this time should not be too early, otherwise it will be difficult to manage the branches in the later stage.

[0034] (3) Foliar spraying of potassium dihydrogen phosphate. Spraying was carried out five times on August 5, August 24, September 12, September 30, and October 16, 2021. The method of use was: 0.25 kg of potassium dihydrogen phosphate was added to 50 kg of tap water and sprayed on 120 pepper trees. The application was carried out in calm or light windy weather.

[0035] The role of potassium dihydrogen phosphate in this embodiment is: through the fertilization method of focusing on nitrogen in the early stage and phosphorus and potassium in the later stage, the purpose of slowing down the growth rate and promoting lignification of branches can be achieved, thereby increasing the nutrient accumulation of branches; at the same time, it also gives full play to the physiological regulation function of nutrient elements, realizes the use of fertilizer instead of medicine, reduces the use of pesticides, and lays a practical foundation for the production of green, ecological, and organic pepper.

[0036] (4) Timely weeding: Weed once between July 29 and 30, 2021, leaving the grass 6 cm high after mowing. Weed once per growing season. Herbicide application is strictly prohibited.

[0037] The purpose of weeding during this period is to stimulate the growth of herbaceous plants, which consumes some nutrients to a certain extent. This creates a competitive relationship between the tree and the herbaceous plants, which can prevent excessive germination. In addition, weeding is not done in winter and spring; the herbs are simply pressed down with sticks.

[0038] (5) Control the number of branches. When new buds sprout, keep 100 buds and 85 branches later. On September 25, 2021, based on the growth, orientation, and space of the branches, remove weak branches, redundant branches, drooping branches, and overlapping branches, leaving 70 branches, so that the distance between branches is more than 20 cm, and improve the efficiency of resource utilization such as light and water. Between December 28 and 30, 2021, cut off the parts of the branches that have not yet become lignified, and keep the branch length at 0.8 meters.

[0039] The reason for thinning non-lignified branches in late December is that the branches have already established their growth trajectory, and branches that have not yet lignified are unlikely to lignify. Therefore, thinning them out can conserve nutrients, promote nutrient return, and increase nutrient accumulation in the branches, laying the foundation for high yield and high quality. Furthermore, if branches are pruned too early, their growth trajectory becomes difficult to predict, which can lead to the risk of misjudgment and incorrect pruning.

[0040] (6) Apply organic fertilizer. On September 25, 2021, fully decomposed cow dung was applied at a dosage of 6 kg per plant to increase the potential for slow-release nutrient supply. The application method is: along the drip line of the tree crown, adopt a ring ditch application method with a depth of 20 cm, evenly spread the decomposed cow dung in the ditch, and cover the surface soil after fertilization. All cow dung comes from nearby farms and has a natural decomposition time of more than 180 days. During the implementation process, we found that pig manure that has been strictly treated by fermentation and disinfection can also achieve the same effect, but pig manure and cow dung are used separately.

[0041] This embodiment has achieved remarkable results, as shown in the following: (1) The yield reaches 350 kg / mu, which is significantly higher than other technologies; (2) From the phenotypic point of view, the trees are strong, the branches are thick (diameter is more than 1 cm), the leaves are lush and green, the growth is good, and the incidence of diseases and insect pests is 5%-10%; (3) In terms of management and maintenance costs, this technology is about 800 yuan / mu, which is 80%-120% lower than other technologies, and to a certain extent improves economic benefits; (4) After implementing this technology, the organic carbon, total nitrogen and total phosphorus of the branches reach 500, 5 and 1.5 grams / kg respectively, which is 1.5-3 times higher than other technologies, effectively promoting the accumulation of nutrients in the branches. The accumulation of nutrients in the branches and the formation of yield and the optimization of quality are mutually reinforcing steps, and the ultimate goal is to improve yield and quality.

[0042] Example 2

[0043] The method for promoting nutrient accumulation in Zanthoxylum bungeanum branches used in this embodiment comprises the following steps:

[0044] (1) Interplanting under the forest. On April 7, 2022, soybeans were interplanted under the forest 50 cm away from the trunk of the Sichuan pepper tree, with 700 holes per mu and a sowing depth of 8 cm. Management was carried out according to conventional methods. Interplanting soybeans takes advantage of their nitrogen-fixing function and forms a complementary relationship with the Sichuan pepper tree in time and space. Its main purpose is to lay a nutrient foundation for the growth of Sichuan pepper in the next season. Therefore, it is the first step of implementation.

[0045] (2) Control nitrogen fertilizer application. From June 22 to 23, 2022, apply compound fertilizer with N:P:K=22:9:9 (produced by Sichuan Jinxiang Sairui Chemical Co., Ltd.) at a rate of 0.6 kg per plant. During the implementation process, the application rate was also appropriately adjusted according to the size of the tree crown.

[0046] The reasons for the overall low application of nitrogen fertilizer are: first, soybeans were intercropped in the early stage, which fixed a part of the nitrogen and stored it in the soil; second, light nitrogen can reduce the stimulation of branch germination and reduce the workload of thinning branches in the later stage; third, nitrogen has a significant promoting effect on plant growth, and appropriate nitrogen application is conducive to the transition from vegetative growth to reproductive growth in the later stage.

[0047] (3) Foliar spraying of potassium dihydrogen phosphate. This was carried out on August 10, August 29, September 18, and October 6, 2021, for a total of 4 sprayings. Each time, 0.3 kg of potassium dihydrogen phosphate was added to 50 kg of tap water and sprayed on 110 pepper trees. Spraying was done evenly, until the leaves were about to drip water, to avoid waste. This technology gives full play to the nutritional and physiological functions of potassium, and improves the efficiency of potassium absorption by applying small amounts and multiple times.

[0048] (4) Timely weeding. Weed once between August 7 and 8, 2022, using mowing methods to keep the height at 8 cm. No manual weeding measures will be taken during the rest of the time, and no herbicides will be used throughout the entire process.

[0049] Properly retaining certain herbs has the following beneficial effects: first, it can give full play to the soil and water conservation function of the ground cover layer and play a role in regulating the microhabitat; second, it provides habitats and shelters for soil organisms, which is conducive to improving soil activity; third, it prevents rapid evaporation of water, delays water loss, and improves the ability to resist drought stress.

[0050] Because soybean planting and other understory herbs have certain symbiotic interactions, and because the phenology of plants varies significantly at different altitudes, the requirements for agronomic practices also differ significantly. Therefore, the use of soybean intercropping and weed control techniques should be analyzed on a case-by-case basis.

[0051] (5) Control the number of branches. When new buds sprout, leave about 110 buds. Then, through thinning measures, leave 90 branches. From September 20 to 21, 2022, based on the growth, orientation, and spatial relationship of the branches, remove weak branches, redundant branches, drooping branches, and overlapping branches, and finally retain 65 branches. On January 4, 2023, cut off the unlignified parts of the top of the branches, and keep the branches at a length of about 1 meter. By using the appropriate number and length of branches, the spatial relationship can be optimized, the utilization efficiency of ecological factors can be improved, and the yield and quality can be improved.

[0052] (6) Apply organic fertilizer. On September 27, 2022, fully decomposed cow dung was applied at a rate of 8 kg per tree. The specific method is as follows: After collecting cow dung from a nearby cattle farm, fully decompose it for more than 180 days to make organic fertilizer. Then, apply it in a circular trench along the drip line of the tree canopy to a depth of 30 cm. After application, cover with topsoil. During the fertilization process, it can also play a role in breaking the roots and controlling the growth of the tree.

[0053] The effects of this embodiment are as follows: (1) the yield reaches 380 kg / mu, which is significantly higher than that of other technologies, indicating that the nutrient status and supply potential of the branches have been greatly improved; (2) the annual management cost is about 820 yuan / mu, which is about 100% lower than that of other technologies, which can save expenses and increase income for pepper farmers; (3) the stress resistance of Dingtan Zanthoxylum bungeanum plants is improved, with the yellow leaf ratio less than 10%, the insect-eaten rate less than 15%, and the branch diameter greater than 0.8 cm; (4) after intercropping soybeans, the income per mu of land increases by more than 2,000 yuan, and it also plays the role of planting instead of management. Overall, it shows that this technology has a significant effect on regulating the nutrient status of branches.

[0054] Comparative Example 1: Heavy nitrogen fertilizer application in May

[0055] In order to highlight the importance of nitrogen fertilizer application period, this comparative example advances the nitrogen fertilizer application time to mid-May, with a dosage of 1-1.2 kg / plant, with the specific application amount adjusted according to the tree vigor; other technical measures are consistent with Example 2 of the present invention. Through this comparison, the purpose is to find out the impact of traditional high-fertilizer and high-water technology on yield.

[0056] Observations have found that the main problems of this comparative example are as follows: (1) On the one hand, nitrogen fertilizer is applied to promote vigorous growth of branches (high nitrogen conditions will also induce a large number of leggy branches), while on the other hand, drugs are needed to promote lignification of branches, which makes the contradiction between vegetative growth and reproductive growth particularly prominent, resulting in great waste. (2) Due to the premature germination of branches, a large number of tender branches and leaves are produced, which brings the peak of rust and aphid outbreaks earlier, overlapping with the fruit picking period, making it difficult to successfully control pests and diseases, and causing a large number of leaves to fall. (3) In terms of operating costs, the comparative example 1 is about 2,000 yuan / mu, especially the high input of drugs and labor, which is much higher than the 800 yuan / mu of this technology; in terms of yield, the comparative example 1 is 150-200 kg / mu, which is only 50% of the level of this technology. In summary, the heavy application of nitrogen fertilizer too early will bring great difficulties to the later operation and management.

[0057] Comparative Example 2: branches are placed naturally

[0058] In the method of retaining branches of Dingtan Zanthoxylum bungeanum, it is common to leave the branches naturally. The specific implementation plan is: in the branch management method, only weak branches, diseased branches, dead branches, etc. are lightly pruned, and the number of remaining branches is not artificially controlled; the technical links such as fertilization, weeding, and intercropping are consistent with Example 2 of the present invention.

[0059] The results showed that: (1) the yield of the control group was only 100-150 kg / mu, significantly lower than that of Example 1 and Example 2, and even failed to reach the average yield of 180-200 kg / mu of top-grade pepper in the region. (2) Crucially, due to the large number of branch grades and the relatively crowded space, the labor cost of picking increased by 1-2 times, and the picking time was extended. Due to the influence of labor, weather, branch germination, etc., there were certain risks, which also brought great pressure to the management of branches in the following year. (3) Due to the large number of thin branches, the water transport channels increased, the probability of tree death increased, and the adaptability to the rocky desertification xerophytic habitat was reduced.

[0060] Comparative Example 3: Each plant ultimately retains 80-90 branches (no thinning in the later stage)

[0061] To highlight the importance of branch number, we compared this with a method without thinning branches later in the process, as Comparative Example 3. The difference between Comparative Example 2 and Comparative Example 3 is that Comparative Example 3 controlled branch number in the early stages but did not thin branches later in the process, while Comparative Example 2 primarily relied on natural branch growth.

[0062] Observations showed that the yield of Comparative Example 3 was 200-300 kg / mu, significantly lower than that of Examples 1 and 2. This is related to the low nutrient supply capacity of the branches. Further analysis revealed that this phenomenon is caused by the excessive number of branches in the later stages, which leads to nutrient diversion and affects nutrient accumulation in the branches. Thinning the branches can promote nutrient return and more concentrated distribution, thus increasing the nutrient content of the branches.

[0063] Comparative Example 4: Weeding in November and May-June

[0064] To illustrate the importance of weeding timing, we set up Comparative Example 4, which weeded three times: the first weeding in mid-November, the second and third weeding in early May and early June of the following year, and each weeding was done as close to the ground as possible. Except for not intercropping, other measures were consistent with Example 2 of the present invention. Because the herbaceous growth in Comparative Example 4 was more vigorous and there was less bare land under the forest, soybeans were not intercropped.

[0065] The observation results are as follows: (1) The yield of comparative example 4 is 200-300 kg / mu, which is lower than that of examples 1 and 2. The yield data reflects the nutrient supply level of the branches to a certain extent. (2) The typical problem of comparative example 4 is that after the herb is cut, the growth rate is accelerated, which to a certain extent enhances the fierceness of nutrient competition and greatly increases the fertilizer requirement, resulting in a waste of nutrient elements and increased fertilizer input. (3) In addition, in order to reduce production costs, some pepper farmers will use herbicides and continuously increase the dosage, causing negative impacts on the ecosystem that are difficult to repair. In summary, improper weeding timing will cause great waste and also have potential ecological risks.

[0066] Comparative Example 5: No interplanting of soybeans

[0067] In order to highlight the effect of interplanting leguminous nitrogen-fixing plants under the forest on the growth of Zanthoxylum bungeanum, we set up a comparison with not interplanting soybeans as Comparative Example 5. The other operating methods are consistent with Example 2 of the present invention.

[0068] Observation results showed that the yield of Comparative Example 5 was 250-350 kg / mu, slightly lower than that of Examples 1 and 2. Regarding tree vigor, intercropping with soybeans resulted in stronger Zanthoxylum bungeanum trees with darker green leaves, which improved photosynthesis. Furthermore, the benefits of intercropping with soybeans were comparable to the cost of garden management, significantly increasing farmers' income.

[0069] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A method for promoting nutrient accumulation in Zanthoxylum bungeanum branches, characterized in that: It includes six steps: intercropping under the forest, controlling nitrogen fertilizer application, spraying potassium dihydrogen phosphate on the leaves, timely weeding, controlling the number of branches and applying organic fertilizer. The specific steps are as follows: (1) Understory interplanting: In early April, soybeans were interplanted under the forest 30-50 cm away from the trunk of the pepper tree, with 600-800 holes per mu and a sowing depth of 5-8 cm; (2) Controlling nitrogen fertilizer application: Apply high-nitrogen compound fertilizer in the early stage, do not apply nitrogen fertilizer heavily from May to mid-June, and apply 0.4-0.6 kg of high-nitrogen compound fertilizer per plant in mid-to-late June; the high-nitrogen compound fertilizer is a high-nitrogen compound fertilizer with an N:P:K ratio of 22:9:9; (3) Foliar spraying of potassium dihydrogen phosphate: starting from the beginning of August, spray 4-5 times in total, with an interval of 15-20 days between each application; (4) Timely weeding: weed once between July 20 and August 10, leaving the grass 5-8 cm high after mowing. No manual weeding measures will be taken during the rest of the time, and no herbicides will be used throughout the entire process. (5) Control the number of branches: leave 100-110 buds when new buds sprout, and leave 80-90 branches later; between September 20 and 30, thin out the branches to keep the number of branches to 60-70; from December 10 to early January of the following year, cut off the parts of the branches that have not yet become lignified, and keep the branches to a length of 0.7-1 meter; (6) Apply organic fertilizer: In late September, apply organic fertilizer at a rate of 5-10 kg per plant.

2. The method according to claim 1, characterized in that The method of using potassium dihydrogen phosphate in step (3) is as follows: 0.25-0.3 kg of potassium dihydrogen phosphate is added to 50 kg of tap water and sprayed on 110-130 Zanthoxylum bungeanum trees.

3. The method according to claim 2, characterized in that The source of the tap water is spring water.

4. The method according to claim 3, characterized in that During the remaining time in step (4), if the herb grows too vigorously, it is forced to fall over with a wooden stick.

5. The method according to claim 4, characterized in that The organic fertilizer in step (6) is fully decomposed cow dung or pig dung.

6. The method according to claim 5, characterized in that The method of applying organic fertilizer in step (6) is: applying the fertilizer in a furrow along the drip line of the tree canopy, with a fertilizer depth of 20-30 cm.

7. Use of any one of the methods described in claims 1 to 6 in the cultivation of Dingtan Zanthoxylum bungeanum.