Whole-growth-period fertilization method for improving yield and quality of vine hanging watermelon substrate cultivation mode and application of whole-growth-period fertilization method

Abstract

The invention relates to a whole-growth-period fertilization method for improving yield and quality of a vine hanging watermelon substrate cultivation mode and application of the whole-growth-period fertilization method, and belongs to the technical field of crop cultivation. The whole-growth-period fertilization method comprises the following steps: mixing a substrate, an organic fertilizer, urea phosphate and borax to obtain seedling culture soil, sowing watermelon seeds, and culturing to obtain watermelon seedlings; spraying a foliar fertilizer to the watermelon seedlings in a vine extension period and a watermelon setting period of the watermelon seedlings; a macroelement water-soluble fertilizer (medium element type) is applied to the watermelon seedlings in the watermelon expanding period of the watermelon seedlings. The whole-growth-period fertilization method can promote growth and development of watermelon seedlings and fruiting and ripening of watermelons, and has the advantages of being easy to operate, stable, effective, safe and free of pollution.

Description

Technical Field

[0001] The invention relates to the technical field of crop cultivation, and in particular to a full-growth-period fertilization method for improving the yield and quality of a hanging vine watermelon substrate cultivation method and an application thereof. Background Art

[0002] Watermelon (Citrullus lanatus) is an annual climbing herb of the Cucurbitaceae family, the genus Citrullus. The fruit is cold in nature and sweet in taste. It is rich in carbohydrates, protein, crude fiber, vitamins, and trace elements such as potassium, calcium, iron, and sodium. It has the effects of promoting fluid production and quenching thirst, relieving inflammation and relieving heat, lowering blood pressure and promoting diuresis. It helps to treat symptoms such as gas stagnation, mouth and nose sores, and summer heat and alcohol poisoning.

[0003] In the traditional watermelon planting method, most of the watermelon production is promoted by applying inorganic fertilizers such as chemical fertilizers and urea. However, the nutrient components in inorganic fertilizers are single in type and insufficient in content, which is far from meeting the nutritional needs of watermelons during the whole growth period, resulting in yellow leaves, slow growth, small fruits, light weight, poor disease resistance, high fruit drop rate, serious diseases and insect pests, etc. In order to improve the yield and quality of watermelons, the existing technology turns to the large-scale application of inorganic fertilizers and pesticides. Although certain results have been achieved in the short term, the long-term application of inorganic fertilizers and pesticides will cause soil compaction, soil deterioration, nutrient structure imbalance, pesticide pollution and residues, etc., so it is impossible to safely and effectively improve the yield and quality of watermelons. Summary of the invention

[0004] The purpose of the present invention is to provide a full growth period fertilization method and application thereof for improving the yield and quality of hanging vine watermelon substrate cultivation mode, so as to solve the problem that the yield and quality of watermelon cannot be safely and effectively improved in the prior art.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a full growth period fertilization method for improving the yield and quality of hanging vine watermelon substrate cultivation, which is characterized by comprising the following steps:

[0007] (1) mixing a substrate, an organic fertilizer, urea phosphate and borax in a mass ratio of 1000:40-60:15-30:2-6 to obtain a seedling soil, sowing watermelon seeds in the seedling soil, and culturing for 15-25 days to obtain watermelon seedlings;

[0008] (2) Spray foliar fertilizer on watermelon seedlings during their vine extension and fruit setting periods;

[0009] (3) During the growth period of watermelon seedlings, apply a large amount of water-soluble fertilizer (medium element type) to the seedlings.

[0010] Preferably, the matrix in step (1) comprises vermiculite, perlite and nutrient soil;

[0011] The mass ratio of the vermiculite, perlite and nutrient soil is 1-3:2-5:2-4.

[0012] Preferably, in the organic fertilizer of step (1), the initial content of nitrogen is 20-40 g / kg, the initial content of phosphorus is 5-12 g / kg, the initial content of potassium is 8-15 g / kg, the initial content of organic matter is 150-300 g / kg, and the initial content of humic acid is 16-22 g / kg.

[0013] Preferably, the time for spraying foliar fertilizer for the first time in step (2) during the vine extension period of the watermelon seedlings is when the first watermelon seedling has just entered the vine extension period;

[0014] During the vine extension period of watermelon seedlings, foliar fertilizer should be sprayed 2 to 3 times, once every 5 to 7 days, and the amount of each spraying is 12 to 18 mL per plant.

[0015] Preferably, the time for spraying foliar fertilizer for the first time in step (2) during the fruit-setting period of the watermelon seedlings is when the first watermelon seedling has just entered the fruit-setting period;

[0016] During the watermelon seedling setting period, foliar fertilizer should be sprayed 2 to 3 times, once every 3 to 5 days, and the amount of each spraying is 30 to 60 mL per plant.

[0017] Preferably, in the foliar fertilizer of step (2), the initial concentration of nitrogen is 120-180 g / L, the initial concentration of phosphorus is 80-120 g / L, and the initial concentration of potassium is 160-200 g / L.

[0018] Preferably, in step (3), the time of applying the macronutrient water-soluble fertilizer (middle-nutrient type) for the first time during the watermelon seedling swelling period is when the first watermelon seedling has just entered the swelling period;

[0019] During the watermelon seedling swelling period, apply large amounts of water-soluble fertilizer (medium element type) 5 to 6 times, once every 5 to 8 days, and the amount applied each time is 8 to 12 g per plant.

[0020] Preferably, in the macro-element water-soluble fertilizer (medium element type) of step (3), the initial content of nitrogen is 180-400 g / kg, the initial content of phosphorus is 50-150 g / kg, and the initial content of potassium is 150-360 g / kg.

[0021] The invention also provides application of the whole growth period fertilization method in planting high-yield and high-quality hanging vine watermelons.

[0022] The present invention has the following technical effects and advantages:

[0023] The organic fertilizer, foliar fertilizer and macronutrient water-soluble fertilizer (medium-nutrient type) of the present invention are respectively rich in organic matter, humic acid, macronutrients (nitrogen, phosphorus, potassium), medium and trace elements (zinc, copper, iron, manganese, molybdenum, calcium, magnesium) and the like, and can fully and comprehensively provide mineral nutrition for watermelon seedlings. In the vine extension period, the calcium in the foliar fertilizer can promote the top growth of the watermelon seedlings and maintain the physiological activity of the top melon vines, and the zinc and copper can promote the growth and development of the melon vines and leaves; in the fruit setting period, the calcium in the foliar fertilizer can prevent the occurrence of concave spots, cracking, brown rot and even necrosis at the fruit pedicle to form navel rot fruits, the zinc can promote the absorption and utilization of potassium by the watermelon seedlings, and the copper has the effect of promoting the normal flowering and fruit setting of the watermelon seedlings;

[0024] In the seedling raising soil of the present invention, borax can provide a large amount of boron for the watermelon seedlings, thereby ensuring that the watermelons can successfully flower and fruit; urea phosphate is rich in nitrogen and phosphorus, can promote the growth and development of watermelon plants, regulate the photosynthesis and respiration of the plants, enhance the stress resistance of the plants, and inhibit the occurrence and spread of watermelon diseases;

[0025] The whole growth period fertilization method of the present invention can promote the growth and development of watermelon seedlings and the fruiting and maturity of watermelons, significantly increase the yield and quality of watermelons, and can improve the fruit setting rate of watermelons. It has the characteristics of simple operation, stable and effective, safe and pollution-free. DETAILED DESCRIPTION

[0026] The present invention provides a full growth period fertilization method for improving the yield and quality of hanging vine watermelon substrate cultivation, which is characterized by comprising the following steps:

[0027] (1) mixing a substrate, an organic fertilizer, urea phosphate and borax in a mass ratio of 1000:40-60:15-30:2-6, preferably 1000:50:18:4, to obtain a seedling soil, sowing watermelon seeds in the seedling soil, and culturing for 15-25 days to obtain watermelon seedlings, preferably 20 days;

[0028] (2) Spray foliar fertilizer on watermelon seedlings during their vine extension and fruit setting periods;

[0029] (3) During the growth period of watermelon seedlings, apply a large amount of water-soluble fertilizer (medium element type) to the seedlings.

[0030] In the present invention, the substrate in step (1) comprises vermiculite, perlite and nutrient soil;

[0031] The mass ratio of the vermiculite, perlite and nutrient soil is 1-3:2-5:2-4, preferably 2:3:3.

[0032] In the present invention, in the organic fertilizer of step (1), the initial content of nitrogen is 20-40 g / kg, preferably 30 g / kg; the initial content of phosphorus is 5-12 g / kg, preferably 8 g / kg; the initial content of potassium is 8-15 g / kg, preferably 12 g / kg; the initial content of organic matter is 150-300 g / kg, preferably 225 g / kg; the initial content of humic acid is 16-22 g / kg, preferably 20 g / kg.

[0033] In the present invention, the time for spraying foliar fertilizer for the first time in step (2) during the vine extension period of the watermelon seedlings is when the first watermelon seedling has just entered the vine extension period;

[0034] During the vine extension period of watermelon seedlings, foliar fertilizer is sprayed 2 to 3 times, preferably 3 times; sprayed once every 5 to 7 days, preferably 6 days; the amount of each spraying is 12 to 18 mL / plant, preferably 15 mL / plant.

[0035] In the present invention, the time for spraying foliar fertilizer for the first time in step (2) during the fruit-setting period of the watermelon seedlings is when the first watermelon seedling has just entered the fruit-setting period;

[0036] The number of times of spraying foliar fertilizer during the fruit-setting period of watermelon seedlings is 2 to 3 times, preferably 2 times; spraying is performed every 3 to 5 days, preferably 4 days; the amount of each spraying is 30 to 60 mL / plant, preferably 45 mL / plant.

[0037] In the present invention, in the foliar fertilizer of step (2), the initial concentration of nitrogen is 120-180 g / L, preferably 150 g / L; the initial concentration of phosphorus is 80-120 g / L, preferably 105 g / L; the initial concentration of potassium is 160-200 g / L, preferably 180 g / L; the initial concentration of zinc is 0.15-0.35 g / L, preferably 0.2 g / L; the initial concentration of copper is 0.2-0.4 g / L, preferably 0.3 g / L; the initial concentration of iron is 0.2-0.5 g / L, preferably 0.35 g / L; the initial concentration of manganese is 0.15-0.6 g / L, preferably 0.4 g / L; the initial concentration of molybdenum is 0.1-0.3 g / L, preferably 0.15 g / L.

[0038] In the present invention, the time for applying the macronutrient water-soluble fertilizer (middle-nutrient type) for the first time in step (3) during the watermelon seedling swelling period is when the first watermelon seedling has just entered the swelling period;

[0039] During the watermelon seedling swelling period, the number of times of applying macro-element water-soluble fertilizer (medium element type) is 5 to 6 times, preferably 6 times; it is applied once every 5 to 8 days, preferably 7 days; the amount applied each time is 8 to 12 g / plant, preferably 10 g / plant.

[0040] In the present invention, in the macro-element water-soluble fertilizer (medium element type) of step (3), the initial content of nitrogen is 180-400 g / kg, preferably 270 g / kg; the initial content of phosphorus is 50-150 g / kg, preferably 120 g / kg; the initial content of potassium is 150-360 g / kg, preferably 220 g / kg; the initial content of calcium is 20-60 g / kg, preferably 35 g / kg; the initial content of magnesium is 20-60 g / kg, preferably 35 g / kg.

[0041] The invention also provides application of the whole growth period fertilization method in planting high-yield and high-quality hanging vine watermelons.

[0042] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0043] In the present invention, the tested hanging vine watermelon variety is Jinbite, with a full growth period of 100 to 105 days, early maturity, round fruit, light green peel covered with dark green stripes, and watermelon seeds purchased from Wenzhou Agricultural Science Research Institute;

[0044] In the present invention, the effective ingredient content of urea phosphate is greater than 99%, purchased from Shandong Pingju Biotechnology Co., Ltd.; foliar fertilizer is purchased from Weifang Wofengyuan Ecological Agriculture Co., Ltd.; organic fertilizer and macronutrient water-soluble fertilizer (medium-nutrient type) are purchased from Liaoning Zhongke Bioengineering Co., Ltd.; borax is agricultural borax with a purity of greater than 95%, a sodium borate content of ≥95%, and a boron content of greater than 10%, purchased from Jilin Zhongnong Jixing Modern Agricultural Technology Service Co., Ltd.;

[0045] In the present invention, the specifications of the planting trough are: upper width 30 cm, bottom width 20 cm, height 24 cm, length 300 cm, purchased from Anping County Shanglin Wire Mesh Products Co., Ltd.; LB32T saccharimeter purchased from Guangzhou Mingrui Electronic Technology Co., Ltd.

[0046] Example 1: Planting and management of watermelon

[0047] (1) Vermiculite, perlite and nutrient soil are mixed in a mass ratio of 2:3:3 to obtain a matrix; the matrix, organic fertilizer, urea phosphate and agricultural borax are mixed in a mass ratio of 1000:50:18:4 to obtain a seedling soil; the seedling soil is laid in a planting trough with an upper width of 30 cm, a bottom width of 20 cm, a height of 24 cm and a length of 300 cm, and a watermelon planting bed is obtained;

[0048] (2) sowing watermelon seeds in the watermelon planting beds, with a sowing spacing of 20 cm, sowing 16 holes in each watermelon planting bed, and cultivating for 20 days to obtain watermelon seedlings;

[0049] (3) Foliar fertilizer was sprayed when the watermelon seedlings were just in the vine extension stage, and then sprayed once every 6 days, with 15 mL sprayed per watermelon seedling for a total of 3 times;

[0050] (4) When the watermelon seedlings just enter the fruit-setting stage, spray foliar fertilizer again, and then spray once every 4 days, spraying 45 mL per watermelon seedling at a time, for a total of 2 times;

[0051] (5) Apply a large amount of water-soluble fertilizer (medium element type) when the watermelon seedlings are just in the swelling stage, and then apply it every 7 days. Apply 10g per watermelon seedling at a time, for a total of 6 times;

[0052] (6) Other management and cultivation of watermelon planting beds were carried out in accordance with conventional management and cultivation methods. The nutrient content of each fertilizer is shown in Table 1.

[0053] Table 1 Nutrient content of fertilizers

[0054]

[0055]

[0056] Example 2: Planting and management of watermelon

[0057] (1) Vermiculite, perlite and nutrient soil are mixed in a mass ratio of 2:3:3 to obtain a matrix; the matrix, organic fertilizer, urea phosphate and agricultural borax are mixed in a mass ratio of 1000:50:18:4 to obtain a seedling soil; the seedling soil is laid in a planting trough with an upper width of 30 cm, a bottom width of 20 cm, a height of 24 cm and a length of 300 cm, and a watermelon planting bed is obtained;

[0058] (2) sowing watermelon seeds in the watermelon planting beds, with a sowing spacing of 20 cm, sowing 16 holes in each watermelon planting bed, and cultivating for 20 days to obtain watermelon seedlings;

[0059] (3) Foliar fertilizer was sprayed when the watermelon seedlings were just in the vine extension stage, and then sprayed once every 5 days. Each watermelon seedling was sprayed with 18 mL at a time, and sprayed twice in total;

[0060] (4) When the watermelon seedlings just enter the fruit-setting stage, spray foliar fertilizer again, and then spray once every 3 days, spraying 30 mL per watermelon seedling for a total of 3 times;

[0061] (5) Apply a large amount of water-soluble fertilizer (medium element type) when the watermelon seedlings are just in the swelling stage, and then apply it every 7 days. Apply 12g per watermelon seedling at a time, and apply it 5 times in total;

[0062] (6) Other management and cultivation of watermelon planting beds were carried out in accordance with conventional management and cultivation methods. The nutrient content of each fertilizer is shown in Table 1.

[0063] Example 3: Planting and management of watermelon

[0064] (1) Vermiculite, perlite and nutrient soil are mixed in a mass ratio of 2:3:3 to obtain a matrix; the matrix, organic fertilizer, urea phosphate and agricultural borax are mixed in a mass ratio of 1000:50:18:4 to obtain a seedling soil; the seedling soil is laid in a planting trough with an upper width of 30 cm, a bottom width of 20 cm, a height of 24 cm and a length of 300 cm, and a watermelon planting bed is obtained;

[0065] (2) sowing watermelon seeds in the watermelon planting beds, with a sowing spacing of 20 cm, sowing 16 holes in each watermelon planting bed, and cultivating for 20 days to obtain watermelon seedlings;

[0066] (3) Foliar fertilizer was sprayed when the watermelon seedlings were just in the vine extension stage, and then sprayed once every 7 days. Each watermelon seedling was sprayed with 12 mL at a time, and sprayed 3 times in total;

[0067] (4) When the watermelon seedlings just enter the fruit-setting stage, spray foliar fertilizer again, and then spray once every 4 days, spraying 60 mL per watermelon seedling at a time, for a total of 2 times;

[0068] (5) Apply a large amount of water-soluble fertilizer (medium element type) when the watermelon seedlings are just in the swelling stage, and then apply it every 5 days. Apply 8g per watermelon seedling at a time, for a total of 6 times;

[0069] (6) Other management and cultivation of watermelon planting beds were carried out in accordance with conventional management and cultivation methods. The nutrient content of each fertilizer is shown in Table 1.

[0070] Comparative Example 1: Planting and Management of Watermelon

[0071] The method described in Example 1 is used to plant and manage watermelons, except that in this comparative example, the method for preparing the seedling soil in step (1) is as follows: the substrate, compound fertilizer A, urea phosphate and agricultural borax are mixed in a mass ratio of 1000:50:18:4, wherein the compound fertilizer A is a mixture of urea, phosphorus pentoxide and potassium sulfate in a mass ratio of 30:8:12;

[0072] Step (5) topdressing a large amount of water-soluble fertilizer B during the watermelon seedling swelling period, wherein the large amount of water-soluble fertilizer B is prepared by mixing urea, phosphorus pentoxide and potassium sulfate in a mass ratio of 270:120:220.

[0073] Comparative Example 2: Planting and Management of Watermelon

[0074] The method described in Example 1 was used to plant and manage watermelons, except that in this comparative example, in step (3), foliar fertilizer was not sprayed during the vine extension period of the watermelon seedlings.

[0075] Comparative Example 3: Planting and Management of Watermelon

[0076] The method described in Example 1 was used to plant and manage watermelons, except that in this comparative example, in step (4), foliar fertilizer was not sprayed during the fruit-setting period of the watermelon seedlings.

[0077] Example 4: Planting and management of watermelon

[0078] The method described in Example 1 was adopted to plant and manage watermelons, except that, in this comparative example, when the first watermelon seedling just entered the flowering stage and the fruit swelling stage, the foliar fertilizer described in Example 1 was sprayed once more, and 10 mL was sprayed for each watermelon seedling.

[0079] Experimental Example 1: Determination of watermelon yield index

[0080] Each watermelon planting bed was used as a treatment group, and a total of 7 treatment groups were set up. The methods described in Examples 1 to 3 and Comparative Examples 1 to 4 were used to plant and manage Jinbite hanging vine watermelons. When the watermelons were ripe, the weight of the ripe watermelons in each treatment group was counted by weighing method, and the total weight was calculated as the yield; at the same time, the external dimensions of the ripe watermelons in each treatment group were measured, and the results are shown in Table 2.

[0081] Table 2 Yield index of watermelon

[0082]

[0083]

[0084] The results show that the watermelon seedlings of Example 1 to 3 grow robustly, the watermelons mature quickly, and there are no cracked or deformed fruits. Compared with the comparative example 1 group which applies urea, phosphorus pentoxide and potassium sulfate, the watermelon yield and size of the watermelons of Example 1 to 3 groups which apply organic fertilizer and macronutrient water-soluble fertilizer (medium-element type) are significantly increased; the watermelon seedlings of the comparative example 2 group are not sprayed with foliar fertilizer during the vine extension period, resulting in slow growth of the watermelon seedlings, thin branches and poor leaf development, thereby affecting the growth and material accumulation of the watermelon; the watermelon seedlings of the comparative example 3 group are not sprayed with foliar fertilizer during the fruit setting period, resulting in 5 watermelons failing to set and develop normally, and only 11 watermelons reaching full maturity, while 16 watermelons of the other treatment groups are reaching full maturity; although the comparative example 4 group is sprayed with foliar fertilizer once more during the flowering period and the fruit swelling period, it does not have a significant effect on the growth and development of the watermelon seedlings and the fruit setting and maturity of the watermelon. It shows that the full growth period fertilization method of the present invention can increase the yield of watermelon.

[0085] Experimental Example 2: Determination of quality indicators of watermelon

[0086] Five ripe watermelons were randomly selected from Example 1 to Example 3 and Comparative Example 1 to Comparative Example 4, and the citrulline content of the ripe watermelons in each treatment group was determined by the method disclosed in the literature by Li Mengmeng et al. (Li Mengmeng, Lu Xuqiang, Zhao Shengjie, et al. Analysis and evaluation of citrulline content in watermelon germplasm resources [J]. Journal of Fruit Science, 2017, 34(4): 482-494). The total VC content of the ripe watermelons in each treatment group was determined by the method disclosed in the literature by Cheng Zhiqiang et al. (Cheng Zhiqiang, Liu Wenge, Liu Zhimin, et al. Comparative study on vitamin C content in watermelon fruits of different ploidy [J]. Journal of Fruit Science, 2008, (05): 760-763). The sugar content of the ripe watermelons in each treatment group was determined by a LB32T saccharimeter. The results are shown in Table 3.

[0087] Table 3 Quality indexes of watermelon

[0088]

[0089]

[0090] The results showed that compared with the comparative examples 1 to 3, the citrulline content, total VC content and sugar content of the ripe watermelons in the examples 1 to 3 were significantly increased; the citrulline content, total VC content and sugar content of the ripe watermelons in the comparative example 4 were slightly increased compared with those in the example 3, but not significantly. This indicates that the whole growth period fertilization method of the present invention can improve the quality of watermelons.

[0091] From the above embodiments, it can be seen that the present invention provides a full-growing period fertilization method and its application for improving the yield and quality of hanging vine watermelon substrate cultivation. The full-growing period fertilization method of the present invention can significantly increase the yield and quality of hanging vine watermelon substrate cultivation, and can improve the fruit setting rate of watermelon, and has the advantages of simple operation, stable and effective, safe and pollution-free.

[0092] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for fertilizing during the whole growth period for improving the yield and quality of hanging vine watermelon in a matrix cultivation method, characterized in that: The steps include: (1) mixing a substrate, an organic fertilizer, urea phosphate and borax in a mass ratio of 1000:40-60:15-30:2-6 to obtain a seedling soil, sowing watermelon seeds in the seedling soil, and culturing for 15-25 days to obtain watermelon seedlings; (2) Spray foliar fertilizer on watermelon seedlings during their vine extension and fruit setting periods; (3) During the growth period of watermelon seedlings, apply a large amount of water-soluble fertilizer (medium element type) to the seedlings.

2. The method for fertilizing during the whole growth period according to claim 1, characterized in that: The matrix described in step (1) comprises vermiculite, perlite and nutrient soil; The mass ratio of the vermiculite, perlite and nutrient soil is 1-3:2-5:2-4.

3. The method for fertilizing during the whole growth period according to claim 2, characterized in that: In the organic fertilizer of step (1), the initial content of nitrogen is 20-40 g / kg, the initial content of phosphorus is 5-12 g / kg, the initial content of potassium is 8-15 g / kg, the initial content of organic matter is 150-300 g / kg, and the initial content of humic acid is 16-22 g / kg.

4. The method for fertilizing during the whole growth period according to claim 1, characterized in that: Step (2) spraying foliar fertilizer for the first time during the vine extension period of the watermelon seedlings is when the first watermelon seedling has just entered the vine extension period; During the vine extension period of watermelon seedlings, foliar fertilizer should be sprayed 2 to 3 times, once every 5 to 7 days, and the amount of each spraying is 12 to 18 mL per plant.

5. The method for fertilizing during the whole growth period according to claim 1, characterized in that: Step (2) spraying foliar fertilizer for the first time during the fruit setting period of the watermelon seedlings is when the first watermelon seedling has just entered the fruit setting period; During the watermelon seedling setting period, foliar fertilizer should be sprayed 2 to 3 times, once every 3 to 5 days, and the amount of each spraying is 30 to 60 mL per plant.

6. The method for fertilizing during the whole growth period according to any one of claims 4 to 5, characterized in that: In the foliar fertilizer of step (2), the initial concentration of nitrogen is 120-180 g / L, the initial concentration of phosphorus is 80-120 g / L, and the initial concentration of potassium is 160-200 g / L.

7. The method for fertilizing during the whole growth period according to claim 1, characterized in that: Step (3) the time of applying the macronutrient water-soluble fertilizer (middle-nutrient type) for the first time during the watermelon seedling swelling period is when the first watermelon seedling has just entered the swelling period; During the watermelon seedling swelling period, apply large amounts of water-soluble fertilizer (medium element type) 5 to 6 times, once every 5 to 8 days, and the amount applied each time is 8 to 12 g per plant.

8. The method for fertilizing during the whole growth period according to claim 7, characterized in that: In the macro-element water-soluble fertilizer (medium element type) of step (3), the initial content of nitrogen is 180-400 g / kg, the initial content of phosphorus is 50-150 g / kg, and the initial content of potassium is 150-360 g / kg.

9. Use of the whole growth period fertilization method according to any one of claims 1 to 8 in planting high-yield and high-quality hanging vine watermelons.

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