Method for interplanting young sophora japonica forest with watermelon

Abstract

The application discloses a method for interplanting watermelon in a young Sophora japonica forest, and comprises the following steps: step one, selection of the interplanting forest land of Sophora japonica, pruning, fertilization and land preparation of Sophora japonica; step two, watermelon planting: taking every 4 adjacent Sophora japonica plants as a basic planting unit to divide the interplanting forest land, then dividing the length and width of each planting unit into multiple equal parts, and intersecting the equal parts to form multiple intersection points, taking one of the intersection points as a watermelon planting hole in the first interplanting year, and taking other intersection points as watermelon planting holes in the next year, and different intersection points are used for rotation in different years; and step three, other field management. The method is favorable for reducing the continuous cropping obstacles of watermelon, in addition, through topping and specific vine handling, the distribution of watermelon branches and vines among Sophora japonica plants and in the rows is rationalized, and the disorderly horizontal climbing of the watermelon vines and the inconvenience brought by the cultivation and walking of the cultivators in the Sophora japonica garden are avoided. Meanwhile, the quality of the crops and the economic benefits of the young Sophora japonica forest land are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of plant cultivation, in particular to a method for interplanting watermelons in young Sophora japonica 'Golden' forests. Background Art

[0002] Sophora japonica L. is a perennial deciduous arbor of the genus Sophora in the family Leguminosae, widely distributed in China and surrounding countries and regions. Its flower bud is called Huaimi (Flos Sophorae). Huaimi is bitter in taste and neutral in nature, and enters the liver and large intestine meridians. In folk practice, Huaimi is commonly used to treat diseases such as hemorrhoid bleeding and hypertension, and its main component rutin has various effects including antibacterial and anti-inflammatory effects, free radical scavenging, antioxidant activity, preventing vascular rupture and hemostasis. Therefore, rutin is widely used in the pharmaceutical and cosmetic industries. Golden Sophora (Jinhuai) is a branch of numerous Sophora japonica varieties, and it gets its name because its produced Huaimi is golden yellow. Studies have shown that the rutin content of Huaimi from Golden Sophora is usually about 35%, and some even reach more than 40%, which is 2-4 times that of ordinary Huaimi. It has become an industry consensus that Huaimi from Golden Sophora has good quality and high rutin content. To meet the demand for rutin extraction, Golden Sophora cultivation targeting Huaimi production has developed rapidly in the past 20 years. Only in the "northern Guangxi-southern Hunan" region, the planting area has reached more than 300,000 mu, and it has become an important agricultural and forestry industry that promotes local farmers to increase income and get rich.

[0003] Golden Sophora has a certain juvenile phase. After seedlings with a seedling age of 1 / 2-0 (the seedling trunk is 1-year-old, the rootstock is 2-year-old, and has not been transplanted) are transplanted into the field, it usually takes 2-3 years before they start to bear Huaimi. If planted at the commonly used planting density in production (the plant-row spacing of Golden Sophora is 3m×3m or 3m×3.5m), it generally takes 7-8 years or even longer after planting for the rows to close. Before row closure, the land between plant (row) spacing in the young Golden Sophora forest is bare. If the land is not utilized, on one hand, it causes waste of land resources, on the other hand, it is prone to weed growth, which unnecessarily increases weeding costs. Moreover, weeds compete with Golden Sophora for fertilizer, bringing adverse effects on the growth of Golden Sophora.

[0004] Watermelon (Citrullus lanatus) is an annual vine belonging to the genus Citrus in the Cucurbitaceae family. Its fruit, the watermelon, is one of the most effective fruits for quenching thirst and relieving summer heat, and is loved for its refreshing sweetness and delicious taste. Watermelon is rich in water and vitamin C, replenishing the body's water and nutrients. In addition, watermelon contains various antioxidants, which help fight free radical damage and delay aging. Watermelon is an economic crop with a short growth cycle, high economic value, and is suitable for growing in major acacia-producing areas such as northern Guangxi and southern Hunan. Currently in southern China, planting one mu (approximately 0.16 acres) of watermelon can generate an income of about 4,000 yuan per season. Many farmers in acacia-producing areas therefore grow watermelons every year, and some growers also intercrop watermelons with acacia trees. However, due to outdated intercropping techniques, the sprawling vines of the watermelons cause significant inconvenience for farmers working and walking in the locust orchards. Furthermore, intercropping results in severe pest and disease problems for both the locust trees and watermelons, as well as low yields and quality of both. Ultimately, the harvest is unsatisfactory, leading some growers to abandon intercropping altogether. Therefore, the locust tree industry urgently needs a method for intercropping watermelons in young locust trees to address the aforementioned problems encountered in its development.

[0005] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a method for intercropping watermelons in young locust trees, thereby overcoming the shortcomings of existing methods for intercropping watermelons in locust trees, such as messy fields, inconvenient walking, and low watermelon yield and quality.

[0007] To achieve the above objectives, the present invention provides a method for intercropping watermelon in young locust trees, comprising the following steps:

[0008] Step 1: Selecting land for intercropping with locust trees, pruning, fertilizing, and preparing the land for golden locust trees;

[0009] Step 2, Watermelon Planting: Divide the intercropping forest into basic planting units of 4 adjacent golden locust trees. Then divide the length and width of each planting unit into multiple equal parts. The lines of equal division intersect to form multiple intersection points. In the first year of intercropping, use one of the intersection points as the watermelon planting hole. In the following year, select other intersection points as watermelon planting holes. Rotate the crop at different intersection points in different years.

[0010] Step 3: Other field management.

[0011] Preferably, in the above technical solution, the selection of intercropping forest land in step one is to select young golden locust forest land where the plants are planted in a rectangular configuration pattern, and golden locust forest land where the plants have been planted for less than 6 years.

[0012] Preferably, in the above technical solution, the pruning of the golden locust tree in step one includes: in January-February of the intercropping year, 15-25cm above the base of the outermost branch of the golden locust tree, select two buds that are adjacent to each other on the left and right sides of the branch, respectively. Using the upper bud as a reference point, prune the branch 1-2cm above it, leaving no buds above the reference point after pruning; at the same time, remove diseased and insect-infested branches, and thin out some overlapping and crossing branches.

[0013] Preferably, in the above technical solution, step one, fertilization and land preparation for the golden locust trees, includes: tilling the soil between rows and between individual plants to a depth of 35-45cm; applying fertilizer by digging circular or strip trenches; and then finely rakeing and leveling the tilled land. Preferably, in the above technical solution, in step two, the length and width of each planting unit are divided into three equal parts, and the lines of division intersect to form four intersection points. One intersection point in each planting unit is used as the center point of the watermelon planting hole. Then, the next intersection point is selected clockwise or counterclockwise as the center point of the watermelon planting hole for the following year, and so on, until the golden locust tree canopy becomes too large and the canopy between rows becomes too dense for intercropping.

[0014] Preferably, in the above technical solution, after selecting the planting hole in step two (watermelon planting), the planting hole is dug and base fertilizer is applied, followed by planting, topping, and vine training.

[0015] Preferably, in the above technical solution, the digging of planting holes and application of base fertilizer includes: digging a planting hole with a length × width × depth of 60-80cm × 60-80cm × 40-60cm at the center point of the selected planting hole, and applying 30-40kg of organic fertilizer, 100-200g of urea, 200-300g of superphosphate, 100-200g of potassium sulfate and 0.5-1g of borax to each hole. After mixing the fertilizer evenly, fill the planting hole with soil, and fill the hole with soil after each layer of fertilizer is applied until the planting hole is full. Then, mix the fertilizer and soil evenly, rake it level, and finally pile a mud tray 10-15cm high on top of it and cover the mud tray with mulch.

[0016] Preferably, in the above technical solution, the watermelon transplanting includes: transplanting in mid-March, with at least 2 seedlings transplanted into each transplanting hole, preferably 2 seedlings per transplanting hole; before transplanting, holes are punched in the mulch covering the transplanting hole, one hole for each seedling, with the distance between holes as large as possible, then 1-2L of 500-700 times diluted potassium permanganate solution is poured into the holes, the holes are then resealed, and the soil is left to ferment for 3-5 days. After that, holes are dug in the soil below the holes in the mulch, and one watermelon seedling is planted in each hole.

[0017] Preferably, in the above technical solution, topping the watermelon includes: topping the vine when it grows to the 4th-6th node.

[0018] Preferably, in the above technical solution, the watermelon vine training includes: guiding the main vines of multiple watermelons in each planting hole towards the inter-plant and inter-row directions of the Sophora japonica, forming an angle of 85-95°, preferably 90°, between the main vines of the watermelons planted between plants and the main vines of the watermelons planted between rows. At this time, the Sophora japonica plant closest to the watermelon planting hole should be inside the angle. After the main vine of each watermelon plant branches out into lateral vines, select 4-5 healthy and uniformly sized lateral vines to retain, and remove the rest. Arrange the retained lateral vines according to the general direction of the main vines, and then press them down with soil every 60-70cm to fix the branches. After the vine training, leave a space of about 50-70cm between the Sophora japonica plants and between the rows as a walkway for the workers to enter and exit.

[0019] Preferably, in the above technical solution, the field management in step three includes spraying pesticides on both the golden locust and watermelon crops simultaneously when spraying to kill flying pests and pathogens and pests that simultaneously use golden locust and watermelon as hosts.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The method of intercropping watermelon in young golden locust trees of the present invention divides the intercropping forest into basic planting units of 4 adjacent golden locust trees. Then, the length and width of each planting unit are divided into multiple equal parts, and the lines of equal parts intersect to form multiple intersection points. In different years, planting holes are dug at different intersection points to intercrop watermelons. This approach helps to reduce the obstacle of continuous cropping of watermelons.

[0022] (2) The method of this invention involves planting at least two watermelon seedlings in each planting hole. A larger number of watermelon plants lays a good foundation for a higher watermelon yield. During vine training, the main watermelon vines are guided towards the spaces between the plants and rows of the *Sophora japonica*, and the lateral vines are arranged according to the general direction of the main vines. This rationalizes the distribution of watermelon vines between the plants and rows. Furthermore, the specific placement of the watermelon planting holes ensures that the planting holes are positioned slightly to the left or right (upper or lower) between the plants and rows of the *Sophora japonica*, allowing for walkways between the plants and rows. This avoids the disorderly horizontal climbing of the vines and the inconvenience caused to farmers working and walking in the *Sophora japonica* orchard due to the lack of walkways. Simultaneously, improving crop quality significantly enhances the economic benefits of young *Sophora japonica* forests.

[0023] (3) In the method of the present invention, when conducting field management, when spraying pesticides on flying pests and pathogens and pests that simultaneously use locust and watermelon as hosts, both locust and watermelon crops are sprayed at the same time, which better ensures that the relevant pests and diseases can be sprayed more comprehensively. Attached Figure Description

[0024] Figure 1 A schematic diagram showing the layout of the watermelon plants and golden locust trees in the first year of intercropping in a single intercropping cycle.

[0025] Figure 2 A schematic diagram showing the layout of the walkways between the watermelon plants and golden locust trees in the second year of an intercropping cycle.

[0026] Figure 3 A schematic diagram showing the layout of the walkways between the watermelon plants and golden locust trees in the third year of intercropping in a single intercropping cycle.

[0027] Figure 4 This is a schematic diagram showing the layout of the aisles between watermelon plants and golden locust trees in the fourth year of intercropping, within a single intercropping cycle.

[0028] Figure 5 This diagram illustrates the use of the center point of each basic unit consisting of four adjacent Sophora japonica plants as the center point for planting watermelons.

[0029] Explanation of key figure labels:

[0030] 1- Golden locust tree plant; 2-Walkway between golden locust trees; 3-Walkway between rows of golden locust trees; 4-Watermelon planting hole; 5-Watermelon main vine. Detailed Implementation

[0031] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0032] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0033] like Figures 1 to 5 As shown, a method for intercropping watermelon in a young locust tree forest according to a specific embodiment of the present invention includes the following steps:

[0034] Step 1: Selecting land for intercropping with locust trees, pruning, fertilizing, and preparing the land for golden locust trees.

[0035] 1. Selection of intercropping forest land: In the golden locust producing area, select golden locust forest land where the plants are planted in a rectangular configuration pattern and which is the second year of planting as intercropping forest land.

[0036] 2. Golden Locust Pruning, Fertilization, and Soil Preparation: In February of the intercropping year, prune the golden locust tree. Specifically, select two adjacent buds on the left and right sides of the branch, 15-25cm above the base of the outermost branch. Using these buds as reference points, shorten the branch about 1.5cm above them, leaving no buds above the reference point. At the same time, remove diseased and insect-infested branches, and thin out some overlapping and crossing branches. Next, till the soil between the rows and plants of the golden locust tree to a depth of about 40cm. Then, apply fertilizer by digging circular or strip trenches according to the traditional method of winter fertilization for golden locust trees. Finally, finely rake and level the tilled soil.

[0037] Step 2: Watermelon Planting

[0038] 1. Planting Hole Location: In the first year of intercropping, the intercropping area is divided into basic units of four adjacent Sophora japonica plants. The rectangular areas of each unit do not overlap. Each unit is then divided into three equal parts, with the dividing lines forming four intersecting points within each unit. In the first year of intercropping, the upper left corner of each unit is uniformly used as the center point of the watermelon planting hole. Figure 1 Then, select the next intersection point clockwise as the center point for the watermelon planting hole in the following year, and so on. Figure 2-4 This process continues until the golden locust tree canopy becomes too large and the canopy between rows becomes too dense to be interplanted.

[0039] 2. Dig planting holes and apply base fertilizer: Dig planting holes 4 with a length × width × depth of 70cm × 70cm × 50cm at the center point of the planting holes selected in step 1. Apply 35kg of organic fertilizer, 150g of urea, 250g of superphosphate, 150g of potassium sulfate and 1g of borax to each hole. Mix the fertilizer well and fill it into the planting hole with soil. After each layer of fertilizer is spread, fill it with soil until the planting hole is full. Then mix the fertilizer and soil evenly and rake it level. Finally, pile a 10cm high mud plate on top of it with soil without fertilizer and cover the mud plate with mulch.

[0040] 3. Transplanting: In early March, grafted seedlings of the superior watermelon variety, Kirin watermelon, are used as transplanting seedlings, with two seedlings planted in each planting hole. Before transplanting, holes are punched in the plastic film of the planting holes and filled with potassium permanganate solution. Specifically, two holes are punched in the plastic film at two opposite locations on the vertical direction of the planting holes, close to the edge of the holes. 1.5L of 600 times diluted potassium permanganate solution is poured into each hole. The holes are then resealed and allowed to ferment for 4 days. Afterward, the holes in the plastic film are dug open, and holes are dug in the soil below. One watermelon seedling is planted in each hole.

[0041] 4. Topping and Vine Training: 20 days after watermelon transplanting, when the vines have grown to about 4-6 nodes, top them off. Then, guide the main vines of the two watermelon plants in each planting hole towards the space between the plants and rows of the locust tree, so that the main vines of the two watermelon plants form an angle of nearly 90° between them. At this time, the locust tree plant closest to the watermelon planting hole should be on the inside of the angle. Figure 1-4 After the main vine of each melon plant branches into lateral vines, select 4-5 healthy and relatively uniform lateral vines to retain, and remove the rest. Arrange the retained lateral vines in a uniform manner according to the general direction of the main vine, and then press them down with soil every 60-70cm to secure them. After arranging the vines, leave a gap of about 50-70cm between the plants and between the rows of the golden locust tree as walkways 2 and 3 for the workers to enter and exit.

[0042] Step 3: Other field management

[0043] In accordance with the common management methods for golden locust and watermelon in production, we should carry out the following tasks for golden locust: promoting flower bud differentiation, controlling pests and diseases, and harvesting locust flowers; and for watermelon plants: seedling fertilization, fruit retention management, pest and disease control, and harvesting. When spraying pesticides for pest and disease control, for flying pests such as cucumber beetles, whiteflies, and locust psyllids, as well as pathogens (such as powdery mildew) and pests (such as beet armyworm) that simultaneously use golden locust and watermelon as hosts, we should spray both crops simultaneously.

[0044] Comparative Example 1

[0045] A method for intercropping watermelon in young locust trees includes the following steps:

[0046] Step 1: Selecting land for intercropping with locust trees, pruning, fertilizing, and preparing the land for golden locust trees.

[0047] 1. Selection of intercropping forest land: In the golden locust producing area, select golden locust forest land where the plants are planted in a rectangular configuration pattern and which is the second year of planting as intercropping forest land.

[0048] 2. Pruning, fertilization, and land preparation of the golden locust tree: The pruning of the golden locust tree is the same as that in Example 1. Do not till the soil between the rows and between the plants. Apply fertilizer directly by digging circular or strip trenches according to the traditional method of applying winter fertilizer to golden locust trees.

[0049] Step 2: Watermelon Planting

[0050] 1. Planting hole location: The intercropping area is divided into units of four adjacent Sophora japonica plants. The rectangular areas occupied by each unit do not overlap. The center point of each unit is fixed as the center point of the watermelon planting hole every year. Figure 5 This process continues until the golden locust trees have excessively large canopies and the canopy between rows is too dense to be intercropped.

[0051] 2. Dig planting holes and apply base fertilizer: Dig planting holes with a length × width × depth of 60cm × 40cm × 40cm at the center point of the planting hole selected in step 1. Apply 30kg of well-rotted farmyard manure and 0.6kg of compound fertilizer (N:P2O5:K2O = 15:15:15) to each hole. Mix the soil dug out of the planting hole with the fertilizer and backfill the hole. Cover the hole with mulch film.

[0052] 3. Transplanting: In early March, grafted seedlings of the superior watermelon variety, Kirin watermelon, are used as transplanting seedlings, with one seedling planted in each planting hole. When transplanting, break the plastic film in the center of the planting hole and dig a hole in the soil below, planting one watermelon seedling in each hole.

[0053] 4. Topping and vine training: When the melon vines reach 30-40cm in length, topping should be done. No further thinning or pruning of the vines is required.

[0054] Step 3: Other field management

[0055] In accordance with the common management methods for golden locust and watermelon in production, we will carry out the following tasks for golden locust: promoting flower bud differentiation, controlling pests and diseases, and harvesting locust flowers; and for watermelon plants: fertilizing seedlings, managing fruit retention, controlling pests and diseases, and harvesting. When applying pesticides for pest and disease control, we will spray either the golden locust or the watermelon separately.

[0056] Comparative Example 2

[0057] Golden locust trees are planted monoculture, meaning that watermelons are not intercropped, and the field management of the golden locust forest is carried out in accordance with traditional methods.

[0058] The parameters such as the yield of harvested goods (locust buds and watermelon) in different intercropping years of Example 1, Comparative Example 1 and Comparative Example 2 were statistically analyzed, and the results are shown in Table 1.

[0059] Table 1. Statistics on the yield of Sophora japonica and watermelon under different intercropping patterns.

[0060]

[0061] Note: The row spacing of the golden locust trees in the examples in the table is approximately 3m × 3.5m, and the average unit price is the most recent wholesale price of locust flower buds and watermelon, respectively.

[0062] As shown in Table 1, the five-year average yield of Sophora japonica buds in the intercropping with watermelon model in young Sophora japonica forests was 40.94 kg / mu and 39.23 kg / mu respectively (Example 1 and Comparative Example 1), while the five-year average yield of Sophora japonica buds in the non-intercropping model was 44.77 kg / mu (Comparative Example 2). The difference in Sophora japonica bud yield between the intercropping and non-intercropping models was not significant. Therefore, it can be seen that intercropping with watermelon under the forest has little impact on the yield of Sophora japonica buds in young Sophora japonica forests.

[0063] The combined annual output value per mu of Sophora japonica buds and watermelon in Example 1, Comparative Example 1, and Comparative Example 2 was RMB 5777.32, RMB 4765.18, and RMB 3133.90, respectively. The former was much higher than the latter two. Therefore, compared with the common Sophora japonica bud intercropping method (Comparative Example 1) and Sophora japonica monoculture (Comparative Example 2) in Sophora japonica bud production areas, the Sophora japonica bud intercropping method (Example 1) of the present invention can significantly improve the economic benefits of Sophora japonica bud forest land.

[0064] Furthermore, compared to the common method of intercropping watermelons in young golden locust trees in locust flower producing areas (Comparative Example 1), the method of intercropping watermelons in young golden locust trees of the present invention (Example 1) makes the distribution of watermelon vines between golden locust trees and between rows more rational, which is convenient for farmers to cultivate and walk in the locust orchard. At the same time, the method of intercropping watermelons in young golden locust trees of the present invention (Example 1) has fewer locust psyllids and watermelon diseases and pests, and the watermelons are more uniform in size and fetch higher prices.

[0065] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A method for intercropping watermelon in young golden locust trees, characterized in that, Includes the following steps: Step 1: Selecting land for intercropping with locust trees, pruning, fertilizing, and preparing the land for golden locust trees; Step 2, Watermelon Planting: Divide the intercropping forest into basic planting units of 4 adjacent golden locust trees. Then divide the length and width of each planting unit into multiple equal parts. The lines of equal division intersect to form multiple intersection points. In the first year of intercropping, use one of the intersection points as the watermelon planting hole. In the following year, select other intersection points as watermelon planting holes. Rotate crops at different intersection points in different years. Step 3: Other field management; Watermelon vine training includes: guiding the main vines of multiple watermelons in each planting hole towards the spaces between the plants and rows of the Sophora japonica, forming an angle of 85-95° between the main vines of the watermelons planted between the plants and the main vines of the watermelons planted between the rows. At this time, the Sophora japonica plant closest to the watermelon planting hole should be on the inside of the angle. After the main vine of each watermelon plant branches out into lateral vines, select 4-5 healthy and uniformly sized lateral vines to retain, and remove the rest. Arrange the retained lateral vines in a uniform manner according to the general direction of the main vines, and then press them down with soil every 60-70cm to fix the branches. After vine training, leave a 50-70cm gap between the Sophora japonica plants and between the rows as a walkway for the workers. Step one of the pruning of the golden locust tree includes: in January or February of the intercropping year, select two buds that are adjacent to each other on the left and right sides of the branch, 15-25cm above the base of the outermost branch of the golden locust tree. Using the upper bud as a reference point, shorten the branch 1-2cm above it, leaving no buds above the reference point after shortening; at the same time, remove diseased and insect-infested branches, and thin out some overlapping and crossing branches.

2. The method for intercropping watermelon in young locust trees according to claim 1, characterized in that, In step one, the selection of intercropping forest land is to select young golden locust forest land where the plants are planted in a rectangular configuration pattern. The young golden locust forest land is forest land where the golden locust plants have been planted for less than 6 years.

3. The method for intercropping watermelon in young locust trees according to claim 1, characterized in that, Step 1, fertilization and land preparation for the golden locust trees, includes: tilling the soil between rows and between individual plants to a depth of 35-45cm; applying fertilizer by digging circular or strip trenches; and then finely raking and leveling the tilled land.

4. The method for intercropping watermelon in young locust trees according to claim 1, characterized in that, In step two, the length and width of each planting unit are divided into three equal parts, and the lines of division intersect to form four intersection points. One of the intersection points in each planting unit is used as the center point of the watermelon planting hole. Then, the next intersection point is selected clockwise or counterclockwise as the center point of the watermelon planting hole for the following year. This process is repeated until the canopy of the golden locust tree is too large and the canopy between the rows is too dense to be intercropped.

5. The method for intercropping watermelon in young locust trees according to claim 1, characterized in that, Step Two: After selecting the planting hole in watermelon planting, dig the planting hole and apply base fertilizer, then proceed with planting, topping, and vine training.

6. The method for intercropping watermelon in young locust trees according to claim 5, characterized in that, The process of digging planting holes and applying base fertilizer includes: digging a planting hole with a length × width × depth of 60-80cm × 60-80cm × 40-60cm at the center of the selected planting hole; applying 30-40kg of organic fertilizer, 100-200g of urea, 200-300g of superphosphate, 100-200g of potassium sulfate, and 0.5-1g of borax to each hole; mixing the fertilizer evenly with the soil and filling it into the planting hole; filling a layer of soil after each layer of fertilizer is applied until the planting hole is full; then mixing the fertilizer and soil evenly and raking it level; finally, piling a 10-15cm high mud mound on top and covering the mud mound with mulch film.

7. The method for intercropping watermelon in young locust trees according to claim 5, characterized in that, Watermelon transplanting includes: transplanting in mid-March, with at least 2 seedlings per planting hole; before transplanting, make holes in the plastic film covering the planting hole, one hole for each seedling, then pour 1-2L of 500-700 times diluted potassium permanganate solution into the holes, then reseal the holes and let it ferment for 3-5 days, then dig holes in the soil below the holes in the plastic film and plant one watermelon seedling in each hole.

8. The method for intercropping watermelon in young locust trees according to claim 5, characterized in that, Topping watermelons involves pinching off the top when the vine reaches 4-6 nodes.

9. The method for intercropping watermelon in young locust trees according to claim 5, characterized in that, Plant two seedlings in one planting hole.

10. The method for intercropping watermelon in young locust trees according to claim 1, characterized in that, In watermelon vine training, the main vines of the watermelon plant are trained to form a 90° angle with the main vines of the watermelon plant between rows.

11. The method for intercropping watermelon in young locust trees according to claim 1, characterized in that, Step three, field management, includes spraying pesticides on both the golden locust and watermelon crops simultaneously when spraying to kill flying pests and pathogens and pests that simultaneously use golden locust and watermelon as hosts.

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