A watermelon seedling raising method suitable for saline-alkali areas

Abstract

The present invention belongs to the technical field of watermelon seedling cultivation, and specifically, is a watermelon seedling cultivation method suitable for saline-alkali areas, and the seedling cultivation method includes seed soaking, germination, sowing, seedling cultivation management and planting. The present invention adds promoting bacteria to the seedling cultivation matrix, which can not only promote the growth of seedlings, but also improve the disease resistance of seedlings. After the seedlings grow the first true leaf, low temperature treatment is selected at noon every day; when the seedlings grow to 2 true leaves, the salt-alkali resistance active liquid is drip-irrigated once, and the salt-alkali resistance active liquid is drip-irrigated again one day before planting, so as to improve the salt-alkali resistance of watermelon seedlings. By adopting the seedling cultivation method of the present invention, the survival rate of watermelon seedlings is as high as 100%, and the survival rate of watermelon seedlings is more than 98% when they are planted in saline-alkali land in Xinjiang, and the salt-alkali resistance of watermelon seedlings is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of watermelon seedling cultivation, and particularly relates to a watermelon seedling cultivation method suitable for saline-alkali areas. Background Art

[0002] Watermelon is a common summer fruit, rich in glucose, malic acid, vitamins and other nutrients. It has high nutritional value and is delicious and juicy, which is widely welcomed by consumers. Xinjiang is a region with vast land and sparse population, unique landforms and long sunshine hours, which helps fruits accumulate nutrients and is one of the important fruit production areas. However, the salinized land in Xinjiang accounts for about one-third of the salinized land in the country, and saline-alkali land management is an important task facing the local area. Watermelon has a certain ability to tolerate salt and alkali, and a low-salt environment promotes the germination of watermelon seeds. However, when the salt concentration of saline-alkali land is reached, the germination of watermelon seeds will be inhibited, so the watermelon seeds must be treated for seedlings first. In addition, due to the high concentration of inorganic salt ions in salinized land, the soil permeability decreases, which hinders the absorption of nutrients and the transportation of water by watermelon seedlings, affecting the normal growth of watermelon seedlings. Therefore, the survival rate of watermelon seedlings in saline-alkali land is not high, the seedlings are slow to grow, and the growth is poor, which increases the cost of watermelon cultivation for melon farmers.

[0003] In the prior art, there is a technique of immersing watermelon seeds in light salt water and then germinating them to improve the salt-alkali resistance of watermelon seeds. Although the germination of seeds is promoted, the quality of watermelon seedlings is still poor and the survival rate of planting is not high. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a watermelon seedling raising method suitable for saline-alkali areas, which achieves the purpose of the invention of increasing the survival rate of watermelon seedlings planted in saline-alkali land and improving the growth of seedlings.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A watermelon seedling raising method suitable for saline-alkali areas comprises the following steps:

[0007] S1. Seed soaking

[0008] Choose watermelon seeds with uniform shape and size and full grains. Dry them in the sun for one day in advance, clean off impurities on the skin, soak them in water for 4 to 5 hours, and then take them out and dry them.

[0009] S2. Germination

[0010] Place the soaked seeds on salt-treated gauze, cover the soaked seeds with a layer of salt-treated gauze, and then place them in a constant temperature germination box for germination for 8 to 10 hours.

[0011] Preferably, the temperature of the constant temperature germination box is 30-35°C.

[0012] Preferably, the salt-treated gauze is gauze soaked in a saline solution.

[0013] Furthermore, the concentration of NaCl in the salt solution is 10-20 mmol / L, the concentration of NaHCO3 is 5-10 mmol / L, and the concentration of Na2CO3 is 10-20 mmol / L.

[0014] Preferably, the salt-treated gauze is changed every 1 hour.

[0015] S3. Seeding

[0016] Place the seedling medium in the hole tray and sow the germinated seeds at a depth of 2 to 3 cm. After sowing, water the seedling medium thoroughly and cover it with a film to keep it warm and moist.

[0017] Preferably, the seedling medium includes coconut bran, perlite, saline-alkali soil, compound fertilizer and promoting bacteria; in terms of weight, the coconut bran is 20-30 parts, the perlite is 10-20 parts, the saline-alkali soil is 40-50 parts, the compound fertilizer is 6-9 parts, and the promoting bacteria is 0.3-0.6 parts.

[0018] Preferably, the content of nitrogen, phosphorus and potassium in the compound fertilizer is 15% each.

[0019] Preferably, the promoting bacteria are fungal spore powder PPF, Trichoderma harzianum and Bacillus subtilis, and the mass ratio of the fungal spore powder PPF, Trichoderma harzianum and Bacillus subtilis is 1-2:1-2:2-4.

[0020] Preferably, the fungal spore powder PPF is purchased from Heilongjiang Yinmitan Biotechnology Co., Ltd.; the Trichoderma harzianum and Bacillus subtilis are purchased from Jinan Wangtian Chemical Co., Ltd.

[0021] Fungal spore powder PPF can decompose the biological compound fertilizer in the seedling matrix into small molecules, which is more conducive to the absorption of watermelon seedlings; Trichoderma harzianum promotes the absorption of nutrients by seedlings, and the secreted biological enzymes and active substances stimulate the growth and development of root cells and promote the growth of seedlings; Bacillus subtilis can improve the disease resistance of seedlings.

[0022] S4. Seedling management

[0023] After sowing, the hole tray is placed in the greenhouse, and the temperature of the greenhouse is maintained at 30-34℃, and the greenhouse is kept ventilated. After the seedlings emerge, the film is removed, and the daytime temperature in the greenhouse is controlled at 22-25℃, and the night temperature is 16-20℃; when the seedlings grow to 2 true leaves, drip-irrigate once with salt-alkali tolerant active liquid, and control the daytime temperature in the greenhouse at 28-30℃, and the night temperature at 18-20℃; drip-irrigate again with salt-alkali tolerant active liquid the day before transplanting.

[0024] Preferably, after the seedlings grow the first true leaf, low-temperature treatment is carried out at noon every day, the temperature of the low-temperature treatment is 4-8°C, and the treatment time is 1-2 hours.

[0025] Preferably, in terms of weight, the salt-alkali resistant active liquid contains 0.1-0.2 parts of soybean peptide, 1.5-3 parts of cis-3-hexenol, 0.8-1.2 parts of glucose, 0.2-0.3 parts of potassium dihydrogen phosphate, and 100-110 parts of water.

[0026] Preferably, the first drip irrigation amount of the salt-alkali resistant active liquid is 10-12 ml per plant, and the second drip irrigation amount is 18-20 ml per plant.

[0027] S5. Planting

[0028] Before transplanting, apply base fertilizer to the field and till the soil evenly. Transplant the seedlings after they have grown 4 true leaves.

[0029] Preferably, the base fertilizer is biological organic fertilizer, and the application amount is 600-700 kg / mu.

[0030] Due to the adoption of the above technical solution, the technical effects achieved by the present invention are:

[0031] 1. By adopting the seedling raising method of the present invention, the survival rate of watermelon seedlings is as high as 100% (except for failure caused by poor seed conditions). When the watermelon seedlings are planted in saline-alkali land in Xinjiang, the survival rate reaches more than 98%, and the salt-alkali tolerance of the watermelon seedlings is effectively improved.

[0032] 2. The present invention uses salt-treated gauze to make the seeds initially adapt to the saline-alkali environment, and appropriate salt concentration is more conducive to seed germination.

[0033] 3. The present invention adds promoting bacteria to the seedling culture medium, which can not only promote the growth of seedlings, but also improve the disease resistance of seedlings.

[0034] 4. The watermelon seedlings cultivated by the method of the present invention not only have stronger salt-alkali tolerance, but also are stronger. It only takes about 18 days from germination to planting, thus shortening the growth cycle.

[0035] 5. After the seedlings grow the first true leaf, choose to carry out low temperature treatment at noon every day. Under low temperature acclimation, the alcohol dehydrogenase and acyltransferase in the seedlings increase; after drip irrigation of salt-alkali tolerance active solution, the soybean peptide in the salt-alkali tolerance active solution can improve the metabolism of the seedlings, and glucose can promote the synthesis of acetyl CoA in the seedlings; cis-3-hexenol is soluble in water and is more easily absorbed by the seedlings. In the seedlings, cis-3-hexenol generates leaf acetate under the action of alcohol dehydrogenase, acyltransferase and acetyl CoA, thereby achieving the purpose of improving the salt-alkali tolerance of watermelon seedlings. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with specific embodiments.

[0037] Example 1

[0038] S1. Seed soaking

[0039] Select 200 watermelon seeds with uniform shape and size and full grains, dry them in the sun for one day in advance, clean off impurities on the surface, soak them in water for 5 hours, and then take them out and dry them.

[0040] S2. Germination

[0041] Place the soaked seeds on salt-treated gauze, cover the soaked seeds with a layer of salt-treated gauze, and then put them in a constant temperature germination box for germination for 9 hours.

[0042] The temperature of the constant temperature germination box is 32°C.

[0043] The salt-treated gauze is gauze soaked in a saline solution.

[0044] The concentration of NaCl in the salt solution is 15 mmol / L, the concentration of NaHCO3 is 7 mmol / L, and the concentration of Na2CO3 is 15 mmol / L.

[0045] Change the salt-treated gauze every 1 hour.

[0046] S3. Seeding

[0047] Place the seedling medium in the hole tray and sow the germinated seeds at a sowing depth of 2.5 cm. After sowing, water the seedling medium thoroughly and cover it with a layer of film to keep it warm and moist.

[0048] The seedling medium comprises coconut bran, perlite, saline-alkali soil, compound fertilizer and promoting bacteria; in terms of weight, the coconut bran is 25 parts, the perlite is 15 parts, the saline-alkali soil is 45 parts, the compound fertilizer is 8 parts, and the promoting bacteria is 0.5 parts.

[0049] The nitrogen, phosphorus and potassium contents in the compound fertilizer each account for 15%.

[0050] The promoting bacteria are fungal spore powder PPF, Trichoderma harzianum and Bacillus subtilis, and the mass ratio of the fungal spore powder PPF, Trichoderma harzianum and Bacillus subtilis is 1.5:1.5:2.5.

[0051] The fungal spore powder PPF was purchased from Heilongjiang Yinmitan Biotechnology Co., Ltd.; the Trichoderma harzianum and Bacillus subtilis were purchased from Jinan Wangtian Chemical Co., Ltd.

[0052] S4. Seedling management

[0053] After sowing, the hole tray is placed in the greenhouse, the temperature of the greenhouse is maintained at 32℃, and the greenhouse is kept ventilated. After the seedlings emerge, the film is removed, and the temperature in the greenhouse is controlled at 24℃ during the day and 18℃ at night. When the seedlings grow to 2 true leaves, drip-irrigate with salt-alkali tolerant active liquid once, and control the temperature in the greenhouse at 29℃ during the day and 19℃ at night. Drip-irrigate with salt-alkali tolerant active liquid again the day before transplanting.

[0054] After the seedlings grew the first true leaf, low temperature treatment was carried out at noon every day. The temperature of the low temperature treatment was 6° C. and the treatment time was 1.5 h.

[0055] In terms of weight, the salt-alkali resistant active liquid contains 0.15 parts of soybean peptide, 2.7 parts of cis-3-hexenol, 1 part of glucose, 0.22 parts of potassium dihydrogen phosphate, and 105 parts of water.

[0056] The first drip irrigation amount of the salt-alkali resistant active liquid is 11 ml per plant, and the second drip irrigation amount is 20 ml per plant.

[0057] S5. Planting

[0058] Before transplanting, apply base fertilizer to the field and till the soil evenly. Transplant the seedlings after they have grown 4 true leaves.

[0059] The base fertilizer is biological organic fertilizer, and the application amount is 650kg / mu.

[0060] Example 2

[0061] S1. Seed soaking

[0062] Select 200 watermelon seeds with uniform shapes and sizes and full grains, dry them in the sun for one day in advance, clean off impurities on the surface, soak them in water for 4 hours, and then take them out and dry them.

[0063] S2. Germination

[0064] Place the soaked seeds on salt-treated gauze, cover the soaked seeds with a layer of salt-treated gauze, and then put them in a constant temperature germination box for germination for 8 hours.

[0065] The temperature of the constant temperature germination box is 35°C.

[0066] The salt-treated gauze is gauze soaked in a saline solution.

[0067] The concentration of NaCl in the salt solution is 10 mmol / L, the concentration of NaHCO3 is 5 mmol / L, and the concentration of Na2CO3 is 20 mmol / L.

[0068] Change the salt-treated gauze every 1 hour.

[0069] S3. Seeding

[0070] Place the seedling medium in the hole tray and sow the germinated seeds at a sowing depth of 2 cm. After sowing, water the seedling medium thoroughly and cover it with a layer of film to keep it warm and moist.

[0071] The seedling medium comprises coconut bran, perlite, saline-alkali soil, compound fertilizer and promoting bacteria; in terms of weight, the coconut bran is 20 parts, the perlite is 10 parts, the saline-alkali soil is 50 parts, the compound fertilizer is 6 parts, and the promoting bacteria is 0.3 parts.

[0072] The nitrogen, phosphorus and potassium contents in the compound fertilizer each account for 15%.

[0073] The promoting bacteria are fungal spore powder PPF, Trichoderma harzianum and Bacillus subtilis, and the mass ratio of the fungal spore powder PPF, Trichoderma harzianum and Bacillus subtilis is 1:1:4.

[0074] The fungal spore powder PPF was purchased from Heilongjiang Yinmitan Biotechnology Co., Ltd.; the Trichoderma harzianum and Bacillus subtilis were purchased from Jinan Wangtian Chemical Co., Ltd.

[0075] S4. Seedling management

[0076] After sowing, the hole tray is placed in the greenhouse, the temperature of the greenhouse is maintained at 30℃, and the greenhouse is kept ventilated. After the seedlings emerge, the film is removed and the temperature in the greenhouse is controlled at 22℃ during the day and 16℃ at night. When the seedlings grow to 2 true leaves, drip-irrigate with salt-alkali tolerant active liquid once, and control the temperature in the greenhouse at 28℃ during the day and 18℃ at night. Drip-irrigate with salt-alkali tolerant active liquid again one day before transplanting.

[0077] After the seedlings grew the first true leaf, low temperature treatment was carried out at noon every day. The temperature of the low temperature treatment was 4° C. and the treatment time was 1 hour.

[0078] In terms of weight, the salt-alkali resistant active liquid contains 0.1 parts of soybean peptide, 1.5 parts of cis-3-hexenol, 0.8 parts of glucose, 0.2 parts of potassium dihydrogen phosphate, and 100 parts of water.

[0079] The first drip irrigation amount of the salt-alkali resistant active liquid is 10 ml per plant, and the second drip irrigation amount is 18 ml per plant.

[0080] S5. Planting

[0081] Before transplanting, apply base fertilizer to the field and till the soil evenly. Transplant the seedlings after they have grown 4 true leaves.

[0082] The base fertilizer is biological organic fertilizer, and the application amount is 600kg / mu.

[0083] Example 3

[0084] S1. Seed soaking

[0085] Select 200 watermelon seeds with uniform shape and size and full grains, dry them in the sun for one day in advance, clean off impurities on the surface, soak them in water for 5 hours, and then take them out and dry them.

[0086] S2. Germination

[0087] Place the soaked seeds on salt-treated gauze, cover the soaked seeds with a layer of salt-treated gauze, and then place them in a constant temperature germination box for germination for 10 hours.

[0088] The temperature of the constant temperature germination box is 30°C.

[0089] The salt-treated gauze is gauze soaked in a saline solution.

[0090] The concentration of NaCl in the salt solution is 20 mmol / L, the concentration of NaHCO3 is 10 mmol / L, and the concentration of Na2CO3 is 20 mmol / L.

[0091] Change the salt-treated gauze every 1 hour.

[0092] S3. Seeding

[0093] Place the seedling medium in the hole tray and sow the germinated seeds at a sowing depth of 3 cm. After sowing, water the seedling medium thoroughly and cover it with a layer of film to keep it warm and moist.

[0094] The seedling medium comprises coconut bran, perlite, saline-alkali soil, compound fertilizer and promoting bacteria; in terms of weight, the coconut bran is 30 parts, the perlite is 20 parts, the saline-alkali soil is 40 parts, the compound fertilizer is 9 parts, and the promoting bacteria is 0.6 parts.

[0095] The nitrogen, phosphorus and potassium contents in the compound fertilizer each account for 15%.

[0096] The promoting bacteria are fungal spore powder PPF, Trichoderma harzianum and Bacillus subtilis, and the mass ratio of the fungal spore powder PPF, Trichoderma harzianum and Bacillus subtilis is 1-2:1-2:2-4.

[0097] The fungal spore powder PPF was purchased from Heilongjiang Yinmitan Biotechnology Co., Ltd.; the Trichoderma harzianum and Bacillus subtilis were purchased from Jinan Wangtian Chemical Co., Ltd.

[0098] S4. Seedling management

[0099] After sowing, the hole tray is placed in the greenhouse, the temperature of the greenhouse is maintained at 34℃, and the greenhouse is kept ventilated. After the seedlings emerge, the film is removed, and the temperature in the greenhouse is controlled at 25℃ during the day and 20℃ at night. When the seedlings grow to 2 true leaves, drip-irrigate with salt-alkali tolerant active liquid once, and control the temperature in the greenhouse at 30℃ during the day and 20℃ at night. Drip-irrigate with salt-alkali tolerant active liquid again the day before transplanting.

[0100] After the seedlings grew the first true leaf, low temperature treatment was carried out at noon every day. The temperature of the low temperature treatment was 8° C. and the treatment time was 2 hours.

[0101] In terms of weight, the salt-alkali resistant active liquid contains 0.2 parts of soybean peptide, 3 parts of cis-3-hexenol, 1.2 parts of glucose, 0.3 parts of potassium dihydrogen phosphate, and 110 parts of water.

[0102] The first drip irrigation amount of the salt-alkali resistant active liquid is 12 ml per plant, and the second drip irrigation amount is 19 ml per plant.

[0103] S5. Planting

[0104] Before transplanting, apply base fertilizer to the field and till the soil evenly. Transplant the seedlings after they have grown 4 true leaves.

[0105] The base fertilizer is biological organic fertilizer, and the application amount is 700kg / mu.

[0106] Comparative Example 1

[0107] Representative Example 1 was selected as Comparative Example 1, in which the promoting bacteria in the seedling culture medium were removed and the rest were the same as Example 1.

[0108] Comparative Example 2

[0109] Representative Example 1 was selected as Comparative Example 2, except that cis-3-hexenol in the salt-alkali resistant active liquid was removed and an equal amount of phytol acetate was sprayed exogenously. The rest was the same as Example 1.

[0110] Comparative Example 3

[0111] Representative Example 1 was selected as Comparative Example 3, except that cis-3-hexenol was removed from the salt-alkali resistant active solution, and the rest was the same as Example 1.

[0112] Comparative Example 4

[0113] Representative Example 1 was selected as Comparative Example 4, except for the low temperature treatment, while the rest was consistent with Example 1.

[0114] The saline-alkali soil of the seedling medium in the examples and comparative examples was collected from a field where watermelon seedlings were planted, and the soil pH was 9.2, and the total salt content was 0.74%.

[0115] The watermelon seedling survival rate, transplanting survival rate, seedling growth and the content of phytol acetate in the seedlings of Examples 1-3 and Comparative Examples 1-4 were measured. The specific results are shown in Table 1.

[0116] Table 1

[0117]

[0118] Note: Seedling survival rate = number of surviving seedlings / total number of seeds × 100%;

[0119] Planting survival rate = number of surviving plants / total number of plants × 100%;

[0120] The method for determining the dry weight of seedlings is as follows: the roots, stems and leaves of seedlings that have grown to 4 true leaves are separated and treated at 105°C for 30 min, then placed in a drying oven at 75°C to constant weight, and the dry weight of the seedlings is weighed and recorded;

[0121] The salt concentration for determination of salt tolerance index was 100mmol / L.

[0122] As can be seen from Table 1, the dry weight of the seedlings in Comparative Example 1 is low and the survival rate of the seedlings is low, indicating that the addition of promoting bacteria can not only promote the growth of seedlings, but also improve the disease resistance of seedlings and improve the survival rate of seedlings; the planting survival rate and salt tolerance index in Comparative Examples 2-4 decreased to varying degrees, indicating that the low temperature treatment and salt-alkali tolerance active liquid both had a certain effect on the salt-alkali tolerance of the seedlings.

[0123] After the seedlings grow the first true leaf, low temperature treatment is carried out at noon every day. Under low temperature acclimation, the alcohol dehydrogenase and acyltransferase in the seedlings increase; after drip irrigation of salt-alkali tolerant active liquid, the soybean peptide in the salt-alkali tolerant active liquid can improve the metabolism of the seedlings, and glucose can promote the synthesis of acetyl CoA in the seedlings; cis-3-hexenol is soluble in water and is more easily absorbed by the seedlings. In the seedlings, cis-3-hexenol generates leaf acetate under the action of alcohol dehydrogenase, acyltransferase and acetyl CoA. That is to say, under the joint action of low temperature treatment and salt-alkali tolerant active liquid, the purpose of improving the salt-alkali tolerance of watermelon seedlings is achieved.

[0124] Unless otherwise specified, the percentages described in the present invention are all mass percentages, the ratios described are all mass ratios; and the raw materials described are all commercially available.

[0125] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A watermelon seedling raising method suitable for saline-alkali areas, characterized in that: The seedling raising method includes seed soaking, germination, sowing, seedling raising management and planting; The seedling management is as follows: the plug tray after sowing is placed in a greenhouse, the temperature of the greenhouse is maintained at 30-34°C, ventilation is maintained in the greenhouse, the film is removed after the seedlings emerge, the temperature in the greenhouse is controlled at 22-25°C during the day and 16-20°C at night; when the seedlings grow to two true leaves, the salt-alkali resistant active liquid is drip-irrigated once, and the temperature in the greenhouse is controlled at 28-30°C during the day and 18-20°C at night; the salt-alkali resistant active liquid is drip-irrigated once again one day before planting; In the seedling management, after the seedlings grow the first true leaf, low temperature treatment is carried out at noon every day, the temperature of the low temperature treatment is 4-8°C, and the treatment time is 1-2h; In terms of weight, the salt-alkali resistant active liquid contains 0.1-0.2 parts of soybean peptide, 1.5-3 parts of cis-3-hexenol, 0.8-1.2 parts of glucose, 0.2-0.3 parts of potassium dihydrogen phosphate, and 100-110 parts of water; The first drip irrigation amount of the salt-alkali resistant active liquid is 10-12 ml per plant, and the second drip irrigation amount is 18-20 ml per plant.

2. A watermelon seedling raising method suitable for saline-alkali areas according to claim 1, characterized in that: The seed soaking method comprises selecting watermelon seeds with uniform shapes and sizes and full grains, drying them in the sun for one day in advance, washing off impurities on the surface, soaking them in water for 4 to 5 hours, and then fishing them out and drying them.

3. A watermelon seedling raising method suitable for saline-alkali areas according to claim 1, characterized in that: The germination is as follows: placing the soaked seeds on salt-treated gauze, covering the soaked seeds with a layer of salt-treated gauze, and then placing the seeds in a constant temperature germination box for germination for 8 to 10 hours.

4. A watermelon seedling raising method suitable for saline-alkali areas according to claim 3, characterized in that: The temperature of the constant temperature germination box is 30-35°C; The salt-treated gauze is gauze soaked in a saline solution; The concentration of NaCl in the salt solution is 10-20 mmol / L, the concentration of NaHCO3 is 5-10 mmol / L, and the concentration of Na2CO3 is 10-20 mmol / L.

5. A watermelon seedling raising method suitable for saline-alkali areas according to claim 1, characterized in that: The sowing method comprises the following steps: placing a seedling medium in a hole tray, and sowing the germinated seeds at a sowing depth of 2 to 3 cm; watering the seedling medium thoroughly after sowing, and then covering it with a film for heat preservation and moisture retention.

6. A watermelon seedling raising method suitable for saline-alkali areas according to claim 5, characterized in that: The seedling culture medium comprises coconut bran, perlite, saline-alkali soil, compound fertilizer and promoting bacteria; in terms of weight, the coconut bran is 20 to 30 parts, the perlite is 10 to 20 parts, the saline-alkali soil is 40 to 50 parts, the compound fertilizer is 6 to 9 parts, and the promoting bacteria is 0.3 to 0.6 parts; The promoting bacteria are fungal spore powder PPF, Trichoderma harzianum and Bacillus subtilis, and the mass ratio of the fungal spore powder PPF, Trichoderma harzianum and Bacillus subtilis is 1-2:1-2:2-4.

7. The watermelon seedling raising method suitable for saline-alkali areas according to claim 1, characterized in that: The field planting includes applying base fertilizer and tilling the field evenly before field planting, and field planting after the seedlings grow to 4 true leaves; The base fertilizer is biological organic fertilizer, and the application amount is 600-700kg / mu.

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