A method for compound planting of polygonatum sibiricum

Abstract

The present application belongs to the technical field of planting of Rhizoma Polygonati, and particularly relates to a compound planting method of Rhizoma Polygonati, comprising the following steps: S1. land preparation and ridge forming; S2. ditching and film mulching; S3. placing moisture-retaining blocks; S4. planting Rhizoma Polygonati; and S5. planting compound crops. The present application changes the single planting of Rhizoma Polygonati into the interplanting of crops, medicine and vegetables, changes the small-ridge cultivation into large-ridge planting, and changes the continuous planting of crops into the rotation between years, so that the crops, medicine and vegetables jointly increase yield and realize benign circulation, the contradiction between medicine and crops for land is relieved, the land utilization rate is improved, the problem of no income in the early stage of Rhizoma Polygonati planting is solved, and the enthusiasm of farmers for planting is improved.

Description

Technical Field

[0001] This invention belongs to the field of Polygonatum cultivation technology, specifically relating to a method for polygonatum compound cultivation. Background Technology

[0002] Polygonatum, a perennial herb belonging to the genus Polygonatum in the family Liliaceae, thrives in shady conditions and is a major medicinal and edible herb historically regarded as a precious ingredient for longevity. In recent years, with increased awareness of healthcare, Polygonatum has become increasingly popular in the market, leading to a growing demand. However, over-harvesting has resulted in the near depletion of wild Polygonatum resources and the destruction of its habitat. Therefore, research into the artificial cultivation of Polygonatum is essential to protect wild resources and address its scarcity.

[0003] Research on Polygonatum sibiricum focuses on its pharmacological effects, propagation techniques, and extraction of chemical components, while research on its artificial cultivation is relatively limited and mostly concentrated on high-yield cultivation, understory cultivation, and intercropping with maize. Traditional Polygonatum sibiricum cultivation involves monoculture, a relatively simple model with insufficient research depth. Harvesting takes 3-5 years, resulting in a long period of limited returns and thus restricting the sustainable development of the Polygonatum sibiricum industry. Understory intercropping is a multi-layered, three-dimensional planting model that introduces Polygonatum sibiricum into forests, saving forest land resources and allowing for the restoration of wild Polygonatum sibiricum resources. Understory cultivation of Polygonatum sibiricum has been implemented in various forest types such as chestnut forests, Chinese fir forests, and bamboo forests. While it improves land utilization and soil nutrients, offering certain ecological benefits, the cultivation and management of forest trees and medicinal plants require significant human and material investment. Furthermore, the lack of early returns from Polygonatum sibiricum cultivation discourages farmers from planting it, failing to mitigate the conflict between long-term and short-term profit risks for farmers.

[0004] Currently, intercropping Solomon's seal with corn in non-forest areas is quite common. Corn is planted in late April and harvested in early August. Although this solves the problem of no income in the early stage of Solomon's seal planting, improper cultivation methods can affect the growth of Solomon's seal. At the same time, after the corn is harvested, Solomon's seal lacks shade in autumn and winter, which affects its growth and prolongs its harvest period. This affects the long-term income of farmers who grow Solomon's seal and restricts the sustainable development of the Solomon's seal industry.

[0005] Therefore, in order to reduce the contradiction between the long-term risk and short-term benefits of farmers planting Polygonatum, it is necessary to conduct further research on the artificial cultivation of Polygonatum. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to provide a method for the integrated cultivation of Polygonatum sibiricum that can achieve a virtuous cycle of increased production of grains, medicinal herbs, and vegetables, alleviate the conflict between medicinal herbs and grains / vegetables over land use, improve land utilization, support long-term growth with short-term gains, solve the problem of no income in the early stages of Polygonatum sibiricum cultivation, and increase farmers' enthusiasm for cultivation.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A method for intercropping Polygonatum sibiricum includes the following steps:

[0009] S1. Land preparation and ridging: Clear the weeds from the field, apply 1000-2000 kg of fully decomposed farmyard manure + 50 kg of cake fertilizer + 30-50 kg of compound fertilizer + 1 kg of humic acid fertilizer per acre, deep plow, harrow, and level the land. Disinfect the soil with carbendazim during plowing, and then spread the mixture in the field. Then plow and mix the soil evenly. Raise the soil to form ridges, with a ridge width of 1.2-1.5 meters and a ridge height of 10-20 cm.

[0010] S2. Trenching: With a row spacing of 25-30 cm, dig planting trenches on the beds with a depth of 10-15 cm and a width of 15-25 cm.

[0011] S3. Place moisture-retaining blocks: Place a layer of moisture-retaining blocks A flat in the planting trench.

[0012] S4. Treatment of Polygonatum rhizomes: Select healthy, disease-free rhizomes of local Polygonatum multiflorum as seed tubers; around early October or late March, dig up the rhizomes, select the tender tips, and cut them into several sections, each with 2-3 nodes and a length of 8-12 cm. Cut the seed tubers according to the nodes to ensure that each seed tuber has at least 1-2 buds. For propagation, soak the seed tubers in a 1000-fold dilution of 50% carbendazim + rooting powder solution for 15 minutes, drain the water, and then coat the tubers with wood ash before planting immediately. Compared with untreated Polygonatum rhizomes, the germination rate of the treated tubers is increased by 40%, and the uniformity of seedling emergence is increased by 50%, which greatly facilitates later management.

[0013] S5. Planting Polygonatum: Before planting, fill the moisture-retaining block A in the trench with a layer of composite soil with a thickness of 1-2 cm. Then, place the Polygonatum tubers flat in the trench at a spacing of 10-15 cm between plants, cover with 5-7 cm of soil, press down slightly, and water once after 3-5 days. Moisturizing block A serves to retain moisture and store water. Its moisture content is higher than that of the surrounding soil and topsoil of the Solomon's seal, and this moisture is less prone to evaporation. By using moisturizing block A, the soil moisture for Solomon's seal growth can be continuously regulated. When moisture evaporates from the surrounding soil and topsoil, or is absorbed by the roots, the soil moisture decreases. Moisturizing block A, located below the Solomon's seal, then continuously transfers moisture upwards through the composite soil, replenishing the moisture lost from the surrounding and topsoil. When the moisture in the surrounding and topsoil increases (such as during rain or watering), moisturizing block A absorbs and stores moisture downwards through the composite soil. This prevents excessive moisture in the surrounding soil and stores sufficient moisture to replenish the soil when the moisture content decreases, maintaining soil moisture and providing continuous water supply for the Solomon's seal growth.

[0014] S6. Planting intercrops: In spring, plant tall crops on both sides of the planting ditch. After the tall crops are harvested in autumn, leave the tall crop stalks in the ground to stand upright. After winter, plant Chinese cabbage on both sides of the planting ditch.

[0015] Furthermore, holes are made at intervals of 15-20cm at the bottom of the planting trench, with a depth of about 8cm and a diameter of 1-2cm, and the holes are filled with composite soil.

[0016] Furthermore, in step S6, the tall crop is corn or sorghum.

[0017] Furthermore, in step S5, after the Polygonatum rhizome is placed flat in the trench, at least one moisture-retaining block B is placed between two adjacent Polygonatum rhizome tubers.

[0018] Furthermore, the moisturizing block A has a height of 3-5cm, a length of 15-25cm, and a width of 15-25cm; the moisturizing block B has a height of 6-12cm, a length of 10-15cm, and a width of 15-25cm.

[0019] Furthermore, both the moisture-retaining block A and the moisture-retaining block B are made by mixing water with chopped straw, chopped corn cobs, dried manure, fly ash, and clay in a weight ratio of 100:(40~60):(25~40):(15~20):(8~15) to form blocks and then drying them.

[0020] Furthermore, the amount of crushed corn cobs used in the moisturizing block A is less than the amount of crushed corn cobs used in the moisturizing block B.

[0021] Furthermore, the moisture-retaining block A is obtained by mixing crushed corn cobs, dried manure, fly ash, and clay with water in a ratio of 100:55:35:18:13, forming it into blocks, and then drying it; the moisture-retaining block B is obtained by mixing crushed corn cobs, dried manure, fly ash, and clay with water in a weight ratio of 100:42:27:16:9, forming it into blocks, and then drying it.

[0022] Furthermore, the moisturizing block A and moisturizing block B can be configured as an integral structure, forming an inverted T-shaped moisturizing block.

[0023] Furthermore, the moisturizing blocks A and B can also be arranged as follows: both moisturizing blocks A and B have through holes in the middle. The lower part of the through hole of moisturizing block A is closed while the upper part extends through the upper surface of moisturizing block A. The two ends of the through hole of moisturizing block B extend through the upper and lower surfaces of moisturizing block B. After moisturizing block A is placed, the through hole in the middle of moisturizing block A is filled with composite soil, and then 1-2 cm of composite soil is added on top of moisturizing block A. Then, the rhizomes of Polygonatum are placed on the composite soil. Next, at least one moisturizing block B is placed between two adjacent rhizomes of Polygonatum. Finally, the through hole in the middle of moisturizing block B is filled with composite soil so that the composite soil inside moisturizing block A is in contact with the composite soil at the bottom of moisturizing block B. To achieve better moisture retention, a moisture-retaining block B is placed between two adjacent Solomon's seal tubers on the composite soil to facilitate rapid water transfer and achieve three-dimensional soil moisture retention. When the soil moisture around the Solomon's seal tubers and on the surface is insufficient, moisture-retaining block B rapidly transfers water laterally to the soil (lateral water transfer is faster than vertical transfer), while moisture-retaining block A vertically transfers water upwards to the soil until the moisture content approaches equilibrium. Moisturizing block B is the main moisture-replenishing mechanism. After the moisture content of moisture-retaining block B decreases (below the moisture content of moisture-retaining block A), the moisture from moisture-retaining block A is transferred to moisture-retaining block B through the composite soil, replenishing the moisture of moisture-retaining block B. When the soil moisture around and on the surface of the Solomon's seal increases (such as during rain or watering), the moisture-retaining block B first quickly absorbs and stores the moisture from the soil around and on the surface of the Solomon's seal. At the same time, the composite soil quickly transfers the moisture downward to the moisture-retaining block A. Moisture-retaining block A and moisture-retaining block B store moisture simultaneously. This not only prevents the soil around and on the surface of the Solomon's seal from becoming too wet, but also stores enough moisture to continue to nourish the soil when the soil moisture content around and on the surface of the Solomon's seal decreases, maintaining soil moisture and providing a continuous water supply for the growth of the Solomon's seal.

[0024] More preferably, before the moisturizing block A is placed into the planting trench, a waterproof layer is first wrapped around the part of the moisturizing block A except for the through hole, so that the moisturizing block A forms a water storage bag with only one inlet and outlet channel (through hole).

[0025] Furthermore, in step S5, the composite soil is obtained by mixing crushed corn cobs and humus in a 2:1 ratio.

[0026] This invention changes the single-crop cultivation of Polygonatum to an intercropping system of grains, medicinal herbs, and vegetables; it changes small-ridge cultivation to large-ridge cultivation; and it changes continuous cropping to inter-year crop rotation. This achieves increased yields and a virtuous cycle for grains, medicinal herbs, and vegetables, alleviating the conflict between medicinal herbs and grains / vegetables for land, improving land utilization, and providing short-term benefits for long-term growth. It also solves the problem of no income in the early stages of Polygonatum cultivation, thus increasing farmers' enthusiasm for planting. Polygonatum requires a large amount of water for growth; the water requirement reaches about 70% during the seedling stage and about 50% during the growth stage. However, Polygonatum is not tolerant of waterlogging, and excessively high field temperatures can lead to... Root rot, anthracnose, and leaf spot are common diseases in Polygonatum sibiricum. The inclusion of moisturizing blocks A and B in this invention not only maintains the high humidity required for Polygonatum sibiricum growth for a long time, continuously replenishing moisture to the surrounding and surface soil, but also absorbs and stores moisture from the surrounding and surface soil when soil moisture is too high, preventing excessive soil moisture. Therefore, the inclusion of moisturizing blocks A and B provides both drought and flood protection, reducing the impact of drought and flood on Polygonatum sibiricum growth, promoting its growth, increasing yield, shortening the harvest period, increasing farmers' income, and enhancing farmers' enthusiasm for planting Polygonatum sibiricum. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0028] It should be noted that the term "comprising" or any other variation is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Example 1

[0029] This embodiment provides a method for intercropping Polygonatum, including the following steps:

[0030] S1. Land preparation and ridging:

[0031] S11. Soil selection: According to the growth characteristics of Polygonatum, Polygonatum is suitable for growing in deep soil rich in organic matter. When planting Polygonatum, it is best to choose soil with a thickness of more than 50 cm, slightly acidic, with a relatively humid environment, and although the winter temperature is low, there is no severe cold.

[0032] S12. Land preparation: First, clear the weeds from the field. Apply 1000-2000 kg of fully decomposed farmyard manure + 50 kg of cake fertilizer + 30-50 kg of compound fertilizer per acre. Deep plow, harrow, and level the land. Disinfect the soil with carbendazim during plowing. Mix the fertilizer with the soil and spread it in the field. Then, turn the soil over and mix it evenly.

[0033] S13. Raising Beds: Beds should be raised in the downwind direction, according to the field's irrigation and drainage needs, to facilitate ventilation and irrigation. Beds should be 1.5 meters wide, and the length can be adjusted appropriately according to the field size, generally around 10 meters for ease of management. Beds should be 15 cm high. Management ditches should be dug between beds, 50 cm wide and 25 cm deep, to facilitate management movement and irrigation / drainage.

[0034] S2. Trenching: Planting trenches with a depth of 15cm and a width of 20cm are dug on the ridges at a row spacing of 25cm.

[0035] S3. Place the moisture-retaining blocks: Place a layer of moisture-retaining blocks A flat in the planting trench. The moisture-retaining blocks A are 4cm high, 20cm long, and 20cm wide. The moisture-retaining blocks A are made by mixing water with chopped straw, chopped corncobs, dried manure, fly ash, and clay in a weight ratio of 100:55:35:18:13, forming them into blocks, and then drying them to obtain a block with high water absorption and water retention.

[0036] S4. Treatment of Polygonatum rhizome tubers:

[0037] S41. Tuber Selection: Select healthy, disease-free tubers from local Polygonatum odoratum as seed tubers. In early October or late March, dig up the rhizomes, select the tender tips, and cut them into several sections, each with 2-3 nodes. The rhizome length should be 8-12 cm. Cut the seed tubers according to the nodes to ensure that each seed tuber has at least 1-2 buds.

[0038] S42. Treatment of seed tubers: Seed tubers for propagation should first be soaked in a solution of 50% carbendazim at 1000 times dilution + rooting powder (the concentration of the solution should be adjusted according to the instructions) for 15 minutes, drain the water, then mix the tubers with wood ash, and then plant them immediately.

[0039] Compared with untreated Polygonatum sibiricum seed blocks, the above treatment increased germination rate by 40% and seedling uniformity by 50%, which greatly facilitated later management.

[0040] S5. Planting Polygonatum:

[0041] S51. Fill with composite soil: Fill the moisture-retaining block A in the trench with a layer of composite soil with a thickness of 1.5cm. The composite soil is made by mixing crushed corn cobs and humus in a ratio of 2:1.

[0042] S52. Planting: Place the Polygonatum rhizome tubers flat on the composite soil in the trench at a spacing of 15 cm. Then, place at least one moisture-retaining block B (each moisture-retaining block B is 10 cm high, 12 cm long, and 20 cm wide) between two adjacent Polygonatum rhizomes. Cover with 9 cm of soil, lightly compact, and water once after 5 days. Keep the soil moist. For plants planted in late autumn, cover with straw before the ground freezes to keep them warm over winter. Remove the straw immediately after thawing and before emergence the following year, keeping the soil moist to promote seedling emergence. The moisture-retaining block B used in this step is made by mixing chopped straw, chopped corn cobs, dried manure, fly ash, and clay in a weight ratio of 100:42:27:16:9 with water, forming blocks, and drying them to obtain a highly absorbent and water-retaining block. Chopped corn cobs have strong water absorption; the amount used will affect the water absorption and retention of the moisture-retaining block.

[0043] S6. Planting intercrops: A planting pattern of Chinese cabbage (winter) + Polygonatum sibiricum + corn (spring) is adopted. Specifically, in spring, a row of corn is planted on both sides of the planting furrow, with two plants per hole and a plant spacing of 35-40 cm. After the corn is harvested in autumn, the corn stalks are left in the ground upright. In winter, Chinese cabbage is planted on both sides of the planting furrow, which can achieve the effects of sufficient shading, weed control, and water retention, while also increasing income. Example 2

[0044] This embodiment adds the following settings based on embodiment 1:

[0045] Both moisturizing block A and moisturizing block B have through holes in their middle parts. The lower part of the through hole of moisturizing block A is closed while the upper part extends through the upper surface of moisturizing block A. The two ends of the through hole of moisturizing block B extend through the upper and lower surfaces of moisturizing block B.

[0046] After placing the moisturizing block A, first fill the through hole in the middle of the moisturizing block A with composite soil, then continue to fill it with 1.5cm of soil. Next, place the Solomon's seal rhizome on the composite soil. Then, place at least one moisturizing block B between two adjacent Solomon's seal rhizomes. Finally, fill the through hole in the middle of the moisturizing block B with composite soil so that the composite soil inside the moisturizing block A comes into contact with the composite soil at the bottom of the moisturizing block B, thereby forming a rapid water transfer channel between the moisturizing blocks A and B.

[0047] When it rains or waters the soil around the Solomon's seal, the soil becomes supersaturated with moisture, which is quickly absorbed and stored by moisture-retaining block B. This moisture is then transferred to the lower, horizontally placed moisture-retaining block A via composite soil for further storage. When the moisture content of the soil around the Solomon's seal decreases and water is scarce, moisture-retaining block B transfers moisture to the surrounding soil to maintain its humidity. As the moisture content in moisture-retaining block B decreases, moisture-retaining block A, lying horizontally at the bottom of the trench, transfers moisture to moisture-retaining block B via composite soil. Moisture-retaining block B then transfers moisture to the surrounding soil until equilibrium is reached, achieving long-lasting, three-dimensional moisture retention. Example 3

[0048] To enhance water retention and long-lasting moisturizing effects, this embodiment is modified based on embodiment 2 as follows:

[0049] Before placing the moisture-retaining block A into the planting trench, a waterproof layer is applied to all parts of the block except for the through-hole, thus creating a water-retaining bag with only one inlet and outlet channel (through-hole). The waterproof layer can be a plastic film or a clay layer, which is obtained by air-drying clay slurry. When the waterproof layer is clay, the through-hole of the moisture-retaining block A is blocked, and then the block A is placed in the clay slurry, coated with the clay slurry. After the clay slurry dries, the through-hole can be opened, and the block A is placed into the planting trench with the through-hole facing upwards. The clay slurry is made by adding water to clay powder, which is obtained by sieving clay, and the fineness of the clay powder is 20-60 mesh. Example 4

[0050] To achieve long-lasting, three-dimensional moisturizing, this embodiment makes the following adjustments based on Embodiment 1 or 2:

[0051] Holes are made at intervals of 15-20cm at the bottom of the planting trench, each hole about 8cm deep and 1-2cm in diameter, and filled with composite soil. When the soil moisture in the trench is too high, exceeding the moisture content of the underlying soil, the moisture from the moisture-retaining blocks at the bottom of the trench is transferred to the soil at the bottom of the trench through these holes. Conversely, when the soil moisture in the trench is too low, below the moisture content of the underlying soil, the moisture from the underlying soil can also be transferred to the moisture-retaining blocks at the bottom of the trench through these holes. The moisture-retaining blocks at the bottom of the trench then transfer moisture to the upper soil layer and the vertical moisture-retaining blocks, achieving long-lasting three-dimensional moisture retention. Example 5

[0052] The difference between this embodiment and any one of embodiments 1-3 is that:

[0053] To improve planting speed, in this embodiment, the moisture-retaining block A and moisture-retaining block B can be set as an integral structure, forming an inverted T-shaped moisture-retaining block.

[0054] Other aspects of this invention that are not detailed herein are all conventional techniques known to those skilled in the art.

[0055] The scope of protection of this invention is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this invention shall fall within the scope of protection of this invention.

Claims

1. A method for intercropping Polygonatum, characterized in that, Includes the following steps: S1. Land preparation and ridging: Clear the weeds from the field, apply 1000-2000 kg of fully decomposed farmyard manure + 50 kg of cake fertilizer + 30-50 kg of compound fertilizer + 1 kg of humic acid fertilizer per acre, deep plow, harrow, and level the land. Disinfect the soil with carbendazim during plowing, spreading it in the field, and then plow and mix the soil evenly. Raise the soil to form ridges, 1.2-1.5 meters wide and 10-20 cm high. S2. Trenching: With a row spacing of 25-30cm, dig planting trenches on the beds with a depth of 10-15cm and a width of 15-25cm. S3. Place moisture-retaining blocks: Place a layer of moisture-retaining blocks A flat in the planting trench; S4. Treatment of Polygonatum rhizomes: Select healthy, disease-free rhizomes of local Polygonatum multiflorum as seed rhizomes; around early October or late March, dig up the rhizomes, select the tender tips, cut them into several sections, each with 2-3 nodes, and the rhizome length should be 8-12cm. Cut the seed rhizomes according to the nodes to ensure that each seed rhizome has at least 1-2 buds; for propagation, soak the seed rhizomes in a 1000-fold dilution of 50% carbendazim + rooting powder solution for 15 minutes, drain the water, then mix the rhizomes with wood ash, and then plant them immediately; S5. Planting Polygonatum: Before planting, fill the moisture-retaining block A in the trench with a layer of soil 1-2cm thick. Prepare composite soil, then place the Polygonatum rhizomes flat in the trench at a spacing of 10-15cm, cover with 5-7cm of soil, and lightly compact. Water once after 3-5 days. After placing the Polygonatum rhizomes flat in the trench, place at least one moisture-retaining block B between two adjacent Polygonatum rhizomes. Both moisture-retaining blocks A and B have through holes in the middle. The through holes of moisture-retaining block A are closed at the bottom and open through the upper surface of moisture-retaining block A. The through holes of moisture-retaining block B open through the upper and lower surfaces of moisture-retaining block B at both ends. After placing moisture-retaining block A, first fill the through hole in the middle of moisture-retaining block A with composite soil, then continue to fill 1-2cm of composite soil on moisture-retaining block A. Then place the Polygonatum rhizomes on the composite soil. Next, place at least one moisture-retaining block B between two adjacent Polygonatum rhizomes. Finally, fill the through hole in the middle of moisture-retaining block B with composite soil so that the composite soil inside moisture-retaining block A is in contact with the composite soil at the bottom of moisture-retaining block B. S6. Planting intercrops: In spring, plant tall crops on both sides of the planting ditch. After the tall crops are harvested in autumn, leave the tall crop stalks in the ground to stand upright. After winter, plant Chinese cabbage on both sides of the planting ditch.

2. The method for intercropping Polygonatum sibiricum according to claim 1, characterized in that: Make holes at intervals of 15-20cm at the bottom of the planting trench, with a depth of about 8cm and a diameter of 1-2cm, and fill the holes with composite soil.

3. The method for intercropping Polygonatum according to claim 1, characterized in that: In step S6, the tall crop is corn.

4. The method for intercropping Polygonatum sibiricum according to claim 1, characterized in that: Both the moisture-retaining block A and the moisture-retaining block B are made by mixing chopped straw, chopped corn cobs, dried manure, fly ash, and clay with water in a weight ratio of 100:(40~60):(25~40):(15~20):(8~15) to form blocks and then drying them.

5. The method for intercropping Polygonatum according to claim 4, characterized in that: The moisture-retaining block A is made by mixing chopped straw, chopped corn cobs, dried manure, fly ash, and clay with water in a weight ratio of 100:55:35:18:13, forming the mixture into blocks, and then drying them. The moisture-retaining block B is made by mixing chopped straw, chopped corncobs, dried manure, fly ash, and clay with water in a weight ratio of 100:42:27:16:9, forming the mixture into blocks, and then drying them.

6. The method for intercropping Polygonatum according to claim 4, characterized in that: The moisturizing block A and moisturizing block B are an integral structure, forming an inverted T-shaped moisturizing block.

7. The method for intercropping Polygonatum according to claim 4, characterized in that: Before the moisture-retaining block A is placed into the planting trench, a waterproof layer is first wrapped around the outside of the moisture-retaining block A, except for the parts with through holes.

8. The method for intercropping Polygonatum according to claim 4, characterized in that: In step S5, the composite soil is obtained by mixing crushed corn cobs and humus in a weight ratio of 2:1.