The practice of watermelon production shows that for every 100 kilograms of watermelon produced, about 0.19 kg of nitrogen, 0.092 kg of phosphorus, and 0.136 kg of potassium are needed. In general, a sufficient amount of nitrogen fertilizer is the basis for high yield of watermelon. Adequate phosphate fertilizer can promote the growth and development of plants, promote flower bud differentiation, make it flower early, sit early and mature early, and potassium is a catalyst for various enzymes in plants, which can promote photosynthesis, protein synthesis and sugar increase. Improve the quality of melons. However, the following points can be grasped when applying specific fertilizers.
First, apply enough base fertilizer. High-yield watermelon fields generally require 3000-5000 kg of organic fertilizer, 75-100 kg of superphosphate, 7 kg of urea, and 5 kg of potassium sulfate per 667 square meters (1 mu). It is advisable to apply the ditch, and the fertilizer can also be applied to the melon ditch or the melon, and then turned into the soil.
Second, skillfully apply seedlings. At the seedling stage of watermelon, sufficient quick-acting fertilizer is needed in the soil to ensure the normal growth of the seedlings. In general, a part of the fertilizer has been applied to the base fertilizer, as long as there is no symptoms of deficiency in the seedling stage. Can not topdress. If the fertilizer applied in the base fertilizer is less, or the plot is not equipped with chemical fertilizer and the melon field showing the symptoms of lack of fertilizer, the amount of seedling fertilizer should be chased in order to promote the normal growth and development of the seedling. The fertilization time is preferably before and after the seedlings grow to 4 to 5 true leaves, or 3 to 5 kg of urea and 10 kg of superphosphate per 667 square meters (1 mu) before the seedling water is poured.
Third, the foot chasing and extending the fertilizer. After the watermelon melon is stretched, it should be applied once before the vine water is poured. Generally, 20 to 25 kilograms of ternary compound fertilizer is applied per 667 square meters, and about 15 kilograms of diammonium phosphate can be applied to promote The stems are elongated.
Fourth, discretion to sit on melon. Before and after the watermelon blossoms, it is a key period for sitting melons. In order to ensure that the watermelon plants can normally sit on the melons, generally do not topdress. However, when the young melon grows to the size of the duck egg, the watermelon enters the peak of the absorption. In this period, if the lack of fertilizer not only affects the expansion of the melon, but also causes the later de-fertilization, the plant premature aging, which not only reduces the yield of watermelon, but also affects the quality of the melon. Therefore, it is necessary to apply the melon fertilizer, generally 8 to 10 kg of urea per 667 square meters (1 mu), 70 to 80 kg of superphosphate, 30 to 40 kg of potassium sulfate, or 667 square meters of ternary compound fertilizer 40 In kilograms, the fertilization amount of high-yield melon fields can also be increased appropriately.
Fifth, the late sprayable leaf fertilizer. After the watermelon is expanded, it will enter the late maturity stage, and the root-absorbing ability of the roots has been obviously weakened. In order to make up for the lack of roots and to ensure the normal maturity and quality of the watermelon, foliar spray fertilizer can be applied. For example, every 667 square meters can be sprayed with 0.3% urea solution, or 0.3% urea and 0.2% potassium dihydrogen phosphate mixture 50-75 kg. In another suitable spray of 0.06% to 0.08% rare earth solution, watermelon sugar content can increase from 0.6% to 1.7%; watermelon or enlargement of 667 m2 spraying 200 g of borax, 2400 g of sucrose, 0.7 g of calcium chloride The solution of 50 kg of water is 50-100 kg, which can generally be sweetened by 1 to 2 degrees, and the yield is increased by 10% to 20%.
First, apply enough base fertilizer. High-yield watermelon fields generally require 3000-5000 kg of organic fertilizer, 75-100 kg of superphosphate, 7 kg of urea, and 5 kg of potassium sulfate per 667 square meters (1 mu). It is advisable to apply the ditch, and the fertilizer can also be applied to the melon ditch or the melon, and then turned into the soil.
Second, skillfully apply seedlings. At the seedling stage of watermelon, sufficient quick-acting fertilizer is needed in the soil to ensure the normal growth of the seedlings. In general, a part of the fertilizer has been applied to the base fertilizer, as long as there is no symptoms of deficiency in the seedling stage. Can not topdress. If the fertilizer applied in the base fertilizer is less, or the plot is not equipped with chemical fertilizer and the melon field showing the symptoms of lack of fertilizer, the amount of seedling fertilizer should be chased in order to promote the normal growth and development of the seedling. The fertilization time is preferably before and after the seedlings grow to 4 to 5 true leaves, or 3 to 5 kg of urea and 10 kg of superphosphate per 667 square meters (1 mu) before the seedling water is poured.
Third, the foot chasing and extending the fertilizer. After the watermelon melon is stretched, it should be applied once before the vine water is poured. Generally, 20 to 25 kilograms of ternary compound fertilizer is applied per 667 square meters, and about 15 kilograms of diammonium phosphate can be applied to promote The stems are elongated.
Fourth, discretion to sit on melon. Before and after the watermelon blossoms, it is a key period for sitting melons. In order to ensure that the watermelon plants can normally sit on the melons, generally do not topdress. However, when the young melon grows to the size of the duck egg, the watermelon enters the peak of the absorption. In this period, if the lack of fertilizer not only affects the expansion of the melon, but also causes the later de-fertilization, the plant premature aging, which not only reduces the yield of watermelon, but also affects the quality of the melon. Therefore, it is necessary to apply the melon fertilizer, generally 8 to 10 kg of urea per 667 square meters (1 mu), 70 to 80 kg of superphosphate, 30 to 40 kg of potassium sulfate, or 667 square meters of ternary compound fertilizer 40 In kilograms, the fertilization amount of high-yield melon fields can also be increased appropriately.
Fifth, the late sprayable leaf fertilizer. After the watermelon is expanded, it will enter the late maturity stage, and the root-absorbing ability of the roots has been obviously weakened. In order to make up for the lack of roots and to ensure the normal maturity and quality of the watermelon, foliar spray fertilizer can be applied. For example, every 667 square meters can be sprayed with 0.3% urea solution, or 0.3% urea and 0.2% potassium dihydrogen phosphate mixture 50-75 kg. In another suitable spray of 0.06% to 0.08% rare earth solution, watermelon sugar content can increase from 0.6% to 1.7%; watermelon or enlargement of 667 m2 spraying 200 g of borax, 2400 g of sucrose, 0.7 g of calcium chloride The solution of 50 kg of water is 50-100 kg, which can generally be sweetened by 1 to 2 degrees, and the yield is increased by 10% to 20%.
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