Method for planting durian trees in northern latitude 21-24 DEG C in large scale by moving durian trees northern

Abstract

The invention relates to the technical field of durian seedling cultivation, in particular to a large-scale planting method for durian tree northern transplantation in northern latitude 21-24 DEG C. A seedling cultivation matrix is composed of 30% of humus soil, 30% of red soil, 20% of bagasse and 20% of walnut meal, 1% of compound microorganisms are added, the mixture is evenly mixed and then used for durian seedling cultivation, and planting comprises the steps of site selection, in the areas, the altitude is lower than 750 m, the annual average temperature is 22 DEG C or above, the annual accumulated temperature is 7000 DEG C or above, the lowest air temperature in recent 10 years is not lower than 10 DEG C, and the relative air humidity is 75%-85%; according to the method, a whole set of unique cultivation technology is created according to the growth and development attributes of the durian and the three-dimensional environment characteristics of the durian in the northern latitude of 21-24 degrees, large-scale cultivation of multiple areas in Yunnan with the northern latitude of 21-24 degrees is successful, under the technical scheme, the root rot rate of the seedlings is lower than 3%, and the survival rate of the durian is higher than 3%. The survival rate of sapling planting can reach 98% or above, and the survival rate in one year can reach 96% or above.

Description

Technical Field

[0001] This invention relates to the field of durian seedling cultivation technology, specifically to a method for large-scale cultivation of durian at latitudes of 21°C to 24°C and the application of supporting seedling cultivation technology. Background Technology

[0002] China is the world's largest consumer of durian, and its durian imports have been steadily increasing in recent years. Currently, my country's durian consumption is almost entirely dependent on imports. Large-scale domestic durian cultivation can help reduce this dependence. Durian is a typical tropical fruit with very demanding environmental requirements. The optimal latitude range for durian cultivation is within 15° north and south of the equator, with the region between 10° and 15° north latitude being particularly ideal. Global durian producing regions include: Malaysia's core durian producing area is between 1° and 6° north latitude (Pahang and Johor); Thailand's core durian producing area is between 5° and 15° north latitude (Rayong and Chanthaburi in the east; and the southern region); Indonesia's core durian producing area is between 5° south and 5° north latitude (Sumatra, Java, and other islands); the Philippines' core durian producing area is between 5° and 15° north latitude (Davao region); and Vietnam's core durian producing area is between 10° and 15° north latitude (the southern Mekong Delta region). A few durian cultivation areas extend to the subtropical fringe regions between 18°N and 18°S, suitable for cultivation in hot, rainy, and typhoon-free areas. For example, in my country, durian cultivation is currently mainly distributed in Baoting County, Lingshui County, Sanya City, Ledong County, and Wuzhishan City in Hainan Province, all located at latitudes around 18°N. It is generally believed that latitude north of 18°N is the limit for large-scale durian cultivation, and the fact that 90% of global durian production is concentrated in the equatorial zone of Southeast Asia further confirms the decisive influence of latitude on durian cultivation. Above 20°N latitude, the growing conditions for durian are unsuitable. In my country, regions between 19°N and 24°N latitude also face the challenges of strong winds and low temperatures. Durian, a giant tropical evergreen tree belonging to the Bombacaceae family, is highly susceptible to these extreme conditions, further complicating its survival. Seedlings often have weak root systems and suffer from severe root rot. Planting diseased seedlings introduces pathogens into newly established orchards, increasing the difficulty of cultivation. Trial plantings have revealed extremely low survival rates, and even when trees survive, they often exhibit stunted growth within a year, failing to develop normally. Therefore, it is urgent to address the problems encountered in the large-scale cultivation of durian trees between 19°N and 24°N latitude to facilitate the widespread planting of domestically grown durian. Summary of the Invention

[0003] This invention aims to provide a method for large-scale cultivation of durian trees beyond 18°N latitude, between 21°N and 24°N latitude. Through steps such as seedling cultivation, seedling selection, scientific planting, induced rooting, and integrated water and fertilizer management, a large-scale durian cultivation system is established. Specifically, this invention provides the following technical solutions: A method for cultivating durian seedlings in latitudes of 21°C to 24°C North involves transplanting grafted seedlings one year after grafting into a cultivation substrate. The substrate, by weight percentage, consists of 30% humus, 30% red soil, 20% sugarcane bagasse, and 20% walnut meal. A 1% (by weight) compound microbial mixture is added to the substrate and thoroughly mixed before being used for durian seedling cultivation. This compound microbial mixture comprises *Bacillus amyloliquefaciens*, *Bacillus laterosporus*, *Bacillus licheniformis*, and *Lactobacillus acidophilus* in a 1:1:1:1 weight ratio, with each microorganism having an effective viable count ≥2 billion CFU / g. Using this method, after two years of cultivation, the root rot rate of durian seedlings is less than 3%.

[0004] A method for large-scale planting of durian trees at latitudes of 21°C to 24°N includes the following steps: (1) Site selection: In the range of 21°C to 24°C north latitude, select an area with no frost throughout the year, an altitude of less than 750 meters, an average annual temperature of more than 22°C, an annual accumulated temperature of more than 7000°C, a minimum temperature of no less than 10°C in the past 10 years, a relative humidity of 75% to 85%, an annual rainfall of more than 1000 mm, and a slightly acidic soil pH of 5.5 to 6.5. (2) Seedling selection: Durian seedlings are non-seedling whole-root seedlings; (3) Planting: Dig planting holes, put in base fertilizer, and transplant seedlings; (4) Promote growth: After watering to settle the roots, pour a growth-promoting solution diluted 30 times along the roots, 1 kg per plant; (5) Field management: Build a shade shed. One month after planting, apply growth-promoting nutrient solution. Dilute the growth-promoting nutrient solution with water 500 times and irrigate the roots of the durian tree. Water the roots with growth-promoting nutrient solution once every month and water the roots with growth-promoting solution diluted 30 times once every three months. Water 1 kg per tree each time. The growth-promoting solution is: collected from Yunnan white pearl (… Gaultheria leucocarpa var. yunnanensis Fresh branches and leaves are crushed to less than 1 cm, and water is added at a material-to-liquid ratio of 1:2 (kg / L). 1% sucrose is added by mass percentage, stirred evenly, and soaked in the dark for 3 days before filtration. The resulting filtrate is the growth-promoting solution. The growth-promoting nutrient solution is composed of fish protein solution and compound microorganisms mixed at a solid-liquid ratio of 1:1, wherein: Fish protein solution: Organic matter ≥100g / L; N+P2O5+K2O ≥60g / L; The compound microorganisms are: Bacillus amyloliquefaciens, Bacillus lateralis, Bacillus licheniformis and Lactobacillus acidophilus are mixed in a mass ratio of 1:1:1:1, and the effective viable count of each bacterium is ≥2 billion / g.

[0005] Preferably, in step (1), areas with an annual accumulated temperature of 7500℃ or higher are selected. Preferably, in step (2), the mainstream varieties Golden Pillow or Black Thorn are selected for areas below 600 meters above sea level, and the cold-resistant durian varieties Musang King and Gan Yao are selected for areas above 600 meters but below 750 meters above sea level.

[0006] Preferably, in step (2), the non-seedling whole-root seedlings include grafted seedlings, cuttings, or layering seedlings.

[0007] Preferably, in step (3), during the transplanting of seedlings, a planting hole is dug for each young tree, with a spacing of 7m x 8m or 8m x 8m between plants and rows. Base fertilizer is placed down and mixed with the soil. The seedling cup is 10-15 cm above the bottom of the planting hole. The seedling cup is removed, the soil is covered back up, and then the surrounding soil is compacted.

[0008] Preferably, two or more varieties are selected for planting in the same plot to pollinate each other, with the ratio of the number of main varieties to pollinating varieties being no less than 8:1.

[0009] Preferably, in step (5), the method of building a sunshade is as follows: with the durian tree as the center, plan an area with a side length of 1.5 to 2.5 meters and build a square frame. Select a shade net with a shading rate of 50% to 70% and spread it on the frame. The east side is not covered with shade net, the north and south sides are fully covered with shade net, and the west side is fully covered with shade net after leaving a gap of 0.5m from the top. Pine needles or straw can be covered at the base to retain moisture.

[0010] The present invention also provides the application of the growth-promoting solution or growth-promoting nutrient solution in the durian cultivation process.

[0011] In one embodiment, the present invention provides a special fertilizer for durian growth, the fertilizer containing the aforementioned growth-promoting liquid or growth-promoting nutrient solution.

[0012] In one embodiment, the present invention provides a special microbial fertilizer for durian growth, wherein the microbial fertilizer contains the aforementioned compound microorganisms.

[0013] This invention, based on the growth and development characteristics of durian and the unique three-dimensional environment of durian trees between 21° and 24° north latitude, has, through years of production practice and scientific research, created a unique set of seedling and cultivation techniques. This has enabled large-scale cultivation in multiple regions of Yunnan Province, located between 21° and 24° north latitude. Under the technical solution of this invention, the root rot rate of durian seedlings is less than 3%, the survival rate of young trees can reach over 98%, and the one-year survival rate is as high as over 96%. This invention provides a theoretical basis and technical support for large-scale durian cultivation in high-latitude regions. This invention has significant economic and strategic importance for durian cultivation in high-latitude regions of my country. Attached Figure Description

[0014] Figure 1 Photos showing the growth of early-planted saplings; Figure 2 On-site diagram of large-scale planting of this invention; Figure 3 Comparative Example 3: Growth after 6 months of planting; Figure 4 Comparative Example 4: Growth after 6 months of planting; Figure 5 Example 2: Growth status after 6 months of planting; Figure 6 Example 2: Survival status of plants one year after planting (on-site photos); Figure 7 Example 2: Growth status diagram after one year of planting. Detailed Implementation

[0015] The following will clearly and completely describe the concept and technical effects of this application in conjunction with embodiments, so as to fully understand the purpose, features and effects of this application. For the experimental methods, purchased goods, unless otherwise specified, shall be used under conventional conditions or conditions recommended by the manufacturer. Unless otherwise defined herein, the scientific and technical terms used in connection with this invention shall have the meanings commonly understood by one of ordinary skill in the art. Exemplary methods and materials are described below, but similar or equivalent methods and materials described herein may also be used in the practice and testing of this disclosure. In this invention, the rooting powder (ABT No. 3) is produced by Shanghai Lanji Technology Development Co., Ltd., and the fish protein liquid is produced by Sinochem Shandong Fertilizer Co., Ltd. (brand: Pulandi). Example 1

[0016] A method for cultivating durian seedlings in latitudes of 21°C–24°N is proposed. One-year-old grafted seedlings are transplanted into a cultivation substrate, which, by weight percentage, consists of 30% humus, 30% red soil, 20% sugarcane bagasse, and 20% walnut meal. A 1% (by weight) compound microbial mixture is added to the substrate and thoroughly mixed before being used for durian seedling cultivation. The compound microbial mixture comprises *Bacillus amyloliquefaciens*, *Bacillus laterosporus*, *Bacillus licheniformis*, and *Lactobacillus acidophilus* in a 1:1:1:1 weight ratio, with each microorganism having an effective viable count ≥2 billion CFU / g. Using this method, after two years of cultivation, the root rot rate of durian seedlings is less than 3%.

[0017] The term "walnut meal" refers to the byproduct obtained after pressing or leaching walnut kernels to extract oil; it is in the form of powder or crumbs. Example 2

[0018] A method for large-scale cultivation of durian trees at latitudes of 21°N to 24°N: 1. Site selection Within the latitude range of 21°C to 24°C north, select areas with no frost throughout the year, no strong winds, an altitude below 750 meters, an average annual temperature above 22°C, an annual accumulated temperature above 7000°C (preferably above 7500°C), a minimum temperature not lower than 10°C in the past 10 years, a relative humidity of 75% to 85%, an annual rainfall of more than 1000 mm, and a slightly acidic soil pH of 5.5 to 6.5.

[0019] The term "annual accumulated temperature" refers to the cumulative value of the daily average temperature within a year that is ≥10 ℃.

[0020] 2. Seedling selection (1) Seedling selection Young seedlings should be less than 3 years old, using non-seedling, whole-root seedlings (such as grafted seedlings, cuttings, or layering seedlings). They should have well-developed root systems, 2-3 branches, dark green leaves, and be healthy and free from pests and diseases. For altitudes below 600 meters, mainstream varieties such as Golden Pillow, Black Thorn, and Gan Yao should be selected. For altitudes between 600 and 750 meters, relatively cold-hardy durian varieties such as Musang King and Sultan King should be used.

[0021] The term "seedlings with whole roots" refers to seedlings propagated directly from seeds, while "non-seedlings with whole roots" refers to seedlings that are not propagated directly from seeds.

[0022] 3. Planting (1) Planting time Planting can be done year-round, but the best time to plant in Yunnan is from May to August.

[0023] (2) Planting method At least two varieties should be selected for planting in the same plot to cross-pollinate. The ratio of main variety to pollinator variety should be no less than 8:1. They can be planted in a staggered or random arrangement. For example, if there are 8 plants of the main variety 'Golden Pillow', 1 plant of 'Black Thorn' can be randomly planted; or if there are 16 plants of the main variety 'Golden Pillow', 1 plant of 'Black Thorn' and 1 plant of 'Ganyao' can be randomly planted.

[0024] Dig planting holes for each young tree, with a spacing of 7m x 8m or 8m x 8m. Place 10-15kg of base fertilizer (fully decomposed organic fertilizer) in the soil and mix it evenly. The seedling cup should be 10-15cm above the bottom of the planting hole. Then remove the seedling cup, cover it with soil, and press the surrounding soil firmly.

[0025] (3) Promote growth After watering to help the roots settle, pour 1 kg of a growth-promoting solution diluted 30 times around the roots of each seedling. When planting the saplings, use a pole to fix and tie the seedlings to the bamboo pole so that they are in an upright position.

[0026] Preparation of growth-promoting solution: Collect Yunnan white pearl ( Gaultheria leucocarpa var. yunnanensisFresh branches and leaves are crushed to less than 1 cm, and water is added at a material-to-liquid ratio of 1:2 (kg / L). 1% sucrose is added by mass percentage. After stirring evenly and soaking in the dark for 3 days, the mixture is filtered. The resulting filtrate is the growth-promoting solution.

[0027] 4. Field Management (1) Construct a shade canopy. Construct a shade canopy according to the size of the tree canopy and the height of the tree. With the durian tree as the center, plan an area with a side length of about 1.5 to 2.5 meters. Use a hammer to drive 4 pillars into the ground about 50 cm deep at the four corners to ensure they are firm. Connect the tops of the pillars at the four corners with 4 horizontal beams and tie them tightly with cable ties or wire to form a sturdy square canopy frame. Select a shade net with a shading rate of 50%-70% and unfold it to cover the frame, ensuring that the net surface is flat. Do not cover the east side with shade net to ensure photosynthesis. Cover the north and south sides with shade net. Cover the west side with shade net from 0.5m down from the top (leaving 0.5m open on the west side is conducive to air circulation). Secure the four corners and the middle section of the shade netting firmly to the frame and supports using cable ties, ropes, or wires to prevent it from being blown away by the wind. The shade canopy can be gradually removed as the durian trees grow. Pine needles or straw can be used to cover the base of the trees to retain moisture, protect them from the sun, and prevent water evaporation. Water the trees as needed, depending on the weather and soil moisture, keeping the soil moist but avoiding waterlogging.

[0028] (2) Apply growth-promoting nutrient solution to young seedlings. The growth-promoting nutrient solution is composed of fish protein solution and compound microorganisms mixed at a solid-liquid ratio of 1:1, wherein: Fish protein solution: Organic matter ≥100g / L; N+P2O5+K2O ≥60g / L; Nitrogen (N): 20g / L, Phosphorus (P2O5): 20g / L, Potassium (K2O): 20g / L; The compound microorganisms are: Bacillus amyloliquefaciens, Bacillus lateralis, Bacillus licheniformis and Lactobacillus acidophilus are mixed in a mass ratio of 1:1:1:1, and the effective viable count of each bacterium is ≥2 billion / g.

[0029] Dilute the growth-promoting nutrient solution with water 500 times and irrigate it at the base of the durian tree. Apply the growth-promoting nutrient solution once a month and once every three months, using 1 kg per tree each time. Comparative Example 1

[0030] The other steps are the same as in Example 1, except that in step 2 the seedlings used are seed-grown whole-root seedlings, and in step 3 the growth-promoting solution is made by diluting rooting powder (ABT No. 3) 500 times before use. The survival rate is counted three months after planting. Comparative Example 2

[0031] The other steps are the same as in Example 1, except that in step 2 the seedlings are planted using grafted seedlings, and in step 3 the growth-promoting solution is applied after diluting rooting powder (ABT No. 3) 500 times. The survival rate is calculated three months after planting. Comparative Example 3

[0032] The other steps are the same as in Example 1, except that in step 4, the growth-promoting nutrient solution does not contain compound microorganisms, and in addition to watering the growth-promoting solution at the time of planting, the growth-promoting solution is used every three months without interruption during subsequent growth. Comparative Example 4

[0033] The other steps are the same as in Example 1, except that in step 4, after using the nutrient solution containing compound microorganisms to promote growth, in addition to watering the growth solution when planting, the growth solution is used every three months for subsequent growth. Field trial examples

[0034] Between 2022 and 2024, during the site selection process within the latitude range of 21°C to 24°C, suitable areas for durian cultivation in Yunnan (21.29°C to 24°C North) were investigated and large-scale plantings were conducted. The selected areas were characterized by year-round frost-free conditions, no strong winds, an altitude below 650 meters, an average annual temperature above 22°C, an annual accumulated temperature above 7000°C, a minimum temperature not lower than 10°C in the past 10 years, relative humidity of 75%–85%, annual rainfall above 1000 mm, and slightly acidic soil with a pH of 5.5–6.5. The following planting sites were selected: Zheha Village, Mengding Town, Gengma County, Lincang City, Yunnan Province, is located at 99°15′50″E, 23°37′42″N. The experimental site (Yuanqi Valley) of the Planting Industry Development Service Center in Honghe Street, Yuanjiang County, Yuxi City, Yunnan Province is located at 101°58′34″ east longitude and 23°36′7″ north latitude. Jinggang Community, Mengla County, Xishuangbanna Prefecture, Yunnan Province, is located at 101°34′21″E, 21°29′28″N. The old sugar factory section of Nawo Village, Jinshuihe Town, Jinping County, Yunnan Province is located at 101°12′08″ east longitude and 22°52′06″ north latitude.

[0035] Trial planting was conducted at the aforementioned locations, and while some seedlings survived, the survival rate was low, and some seedlings exhibited stunted growth. Figure 1 As shown, the seedlings exhibit yellowing and withering leaves that gradually fall off, and their branches and trunks shrink until they die.

[0036] A growth-promoting experiment was conducted in Zheha Village, Mengding Town, Gengma County, Lincang City, Yunnan Province, which met the site selection criteria. The durian saplings investigated were two-year-old grafted durian seedlings planted on May 17, 2024, and were managed with the same fertilizer, water, and pest control measures (planted at a spacing of 7m × 7m). The investigation method involved tracking the growth of durian saplings of different varieties under different treatments within the base. Twenty trees of each variety were randomly selected, and primary branches from each tree in the four cardinal directions (east, south, west, and north) were investigated. The first investigation was conducted on August 18, 2024, and the survival rate was recorded. The second investigation was conducted on November 18, 2024, and agronomical traits, including plant height, primary branching, and primary adventitious roots, were investigated. The third investigation was conducted on May 18, 2025, and the survival rate was recorded.

[0037] The durian varieties investigated were Golden Pillow, Musang King, and Black Thorn. The measured indicators were plant height and the length of primary branches. Plant height was measured using a measuring tape, from the ground surface to the highest growing point, accurate to 1 cm. The length of primary branches was measured using a measuring tape, from the branching point to the farthest end of the branch, accurate to 0.1 cm.

[0038] Table 1. Effects of seedlings and growth-promoting agents on the survival rate of durian. deal with Survival rate (%) Comparative Example 1 22.9 Comparative Example 2 42.4 Example 2 98.6 Table 2 Effects of different treatments on durian growth

[0039] Note: Different lowercase letters indicate significant differences between treatments in the same column at the 0.05 level, while uppercase letters indicate highly significant differences at the 0.01 level.

[0040] During their growth, durian saplings in high-latitude regions (between 21°C and 24°C north latitude) cannot meet the environmental requirements of high temperature, high humidity, and sunlight needed for durian to grow year-round in low-latitude regions (near the equator). Especially above 20°N latitude, it is difficult to meet the accumulated temperature and overwintering requirements for durian growth, making it difficult for them to survive the winter when grown outdoors. Even if they do survive, saplings must resist the stresses brought by large fluctuations in environmental conditions such as temperature, humidity, and light, as well as pests and diseases, which can lead to growth stagnation, growth regression, and plant death. During the planting stage, strong sunlight (especially direct sunlight in summer) can scorch the leaves, causing them to wither and fall off, affecting photosynthesis and growth. Durian seedlings have underdeveloped root systems, and the intense sunlight causes rapid water evaporation from the above-ground parts, easily leading to dehydration and wilting. Under excessive stress, durian seedlings will use energy to resist adversity rather than for growth. The shading and root-promoting methods of this invention help seedlings adapt to the environment quickly, achieving a survival rate of 98.6% three months after planting. In the post-planting growth stage, using the cultivation and management methods of this invention, supplementing nutrients and stimulating growth, durian seedlings can grow normally six months after transplanting. The increase in plant height, the increase in primary branching, and the average increase in primary adventitious roots are all significantly higher than the control group (Table 2). Figure 2 , Figure 3 , Figure 4 , Figure 5 After transplanting for one year and through one winter, the survival rate reached 96.1%. Figure 6 , Figure 7 ).

[0041] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for cultivating seedlings of Durio zibethinus in the region of 21 °N to 24 °N, characterized by, The small seedlings grafted for one year are transplanted to a cultivation substrate composed of 30% humus, 30% red soil, 20% sugarcane residue and 20% walnut meal in mass percentage, and a composite microorganism is added to the cultivation substrate in a mass ratio of 1% and mixed uniformly, and then used for cultivation of the durian seedlings, the composite microorganism is mixed by Bacillus amyloliquefaciens, Brevibacillus laterosporus, Bacillus licheniformis and Lactobacillus acidophilus in a mass ratio of 1:1:1:1, and the effective viable bacterial count of each bacterium is greater than or equal to 2 billion / g.

2. A method for large-scale cultivation of northward transplanted durian trees in the north latitude of 21-24 °C, characterized in that, The method comprises the following steps: (1) site selection: in the interval of 21-24 degrees north latitude, select the area with the following conditions: no frost throughout the year, altitude below 750 meters, annual average temperature above 22 degrees Celsius, annual accumulated temperature above 7000 degrees Celsius, lowest temperature in the past 10 years not less than 10 degrees Celsius, air relative humidity 75%-85%, annual rainfall above 1000 mm, and soil pH 5.5-6.5; (2) seedling selection: non-true whole root seedlings are used for durian seedlings; (3) planting: dig planting holes, place base fertilizer, and transplant seedlings; (4) promoting growth: after watering the root water, dilute the promoting solution by 30 times, and irrigate 1 kg per plant; (5) field management: build a sunshade shed, apply growth-promoting nutrient solution after planting for one month, dilute the growth-promoting nutrient solution with water by 500 times, and irrigate the root of the durian tree, irrigate the growth-promoting nutrient solution once every month, irrigate the dilution of 30 times of the promoting solution once every three months, and irrigate 1 kg per plant each time; The growth-promoting solution is: collected from Yunnan white pearl (… Gaultheria leucocarpa var. yunnanensis Fresh branches and leaves are crushed to less than 1 cm, and water is added at a material-to-liquid ratio of 1:2 (kg / L). 1% sucrose is added by mass percentage, stirred evenly, and soaked in the dark for 3 days before filtration. The resulting filtrate is the growth-promoting solution. The growth-promoting nutrient solution is mixed by fish protein solution and composite microorganism in a solid-liquid ratio of 1:1, wherein: The fish protein solution contains organic matter≥100g / L; N+P2O5+K2O≥60g / L; The composite microorganism is mixed by Bacillus amyloliquefaciens, Brevibacillus laterosporus, Bacillus licheniformis and Lactobacillus acidophilus in a mass ratio of 1:1:1:1, and the effective viable bacterial count of each bacterium is greater than or equal to 2 billion / g.

3. The method of claim 2, wherein, In step (1), the area with an annual accumulated temperature of 7500 degrees Celsius or more is selected, and in step (2), the gold pillow or black thorn main variety is selected for use below an altitude of 600 meters, and the cold-resistant durian variety cat mountain king or Ganyao is selected for use between an altitude of 600 meters and 750 meters.

4. The method of claim 2, wherein, In step (2), the non-true whole root seedlings include grafted seedlings, cuttings or layering seedlings.

5. The method of claim 2, wherein, In step (3), during the process of transplanting seedlings, a single seedling is dug in a planting hole with a plant spacing of 7m x 8m or 8m x 8m, base fertilizer is placed and mixed with the soil, the seedling cup is 10-15 cm higher than the bottom of the planting hole, the seedling cup is removed, the soil is covered, and then the surrounding soil is compacted.

6. The method of claim 3, wherein, Two or more varieties are selected for planting in the same plot to pollinate each other, and the number of main varieties and pollination varieties is not less than 8:

1.

7. The method of claim 2, wherein, The method for building the sunshade canopy in step (5) is as follows: taking the durian tree as the center, a square frame with a side length of 1.5-2.5 meters is planned and built, a sunshade net with a shading rate of 50%-70% is selected and unfolded to cover the frame, the sunshade net is not covered on the east side, the sunshade net is fully covered on the south and north sides, the sunshade net is fully covered from the top 0.5 m on the west side, and pine needles or straw can be covered at the root to keep moist.

8. The use of the growth promoting liquid or growth promoting nutrient liquid in claim 2 in the process of durian planting.

9. A fertilizer for growing durians, characterized by comprising: The fertilizer contains the growth promoting liquid or growth promoting nutrient liquid in claim 2.

10. A microbial bacterial fertilizer for durian growth, characterized by, The microbial fertilizer contains the compound microorganism in claim 1.

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