Watermelon fertilization stress

The simple application of nitrogen fertilizer in watermelon, easily lead to vine leaves, affect the fruit setting rate, reduce the number of melons, reduce the sweetness. Pay attention to the use of nitrogen, phosphorus, and potassium fertilizers and apply organic fertilizers such as chicken litter, duck droppings, cake fat, and ash. Because of long-term manure effects, it is beneficial to promote plant robustness, enhance plant resistance to disease, and improve watermelon quality and sugar content. The use of chlorinated fertilizer in watermelons will affect the quality of fruits and reduce the sweetness. Therefore, nitrogen fertilizer should be urea, ammonium sulfate is good; Potassium fertilizer should be potassium sulfate, grass ash is appropriate, and should not use ammonium chloride and potassium chloride and other chlorinated fertilizers. When the soil is dry, the application of high concentration of the watermelon will make the cytosol solution of the root system penetrate outward, causing the separation of the cytoplasmic wall, resulting in physiological water loss and withering of the watermelon vine leaves, until the plants die. Therefore, in dry weather, when the soil moisture content is low, it should be watered and fertilized before fertilizing the soil. Rainy weather has high humidity and high soil moisture content. Watermelon fertilizer at this time, fertilizer is not only easy to lose, but vine leaves long, tender leaves easy to induce pests and diseases. With the extension of melon vines, the roots of the watermelons have gradually expanded. Fertilizers are applied near the roots and the fertilizers are not fully absorbed and utilized. Therefore, fertilization should be based on the extension of vines, from the farther to the farther away from the roots of the plant in order to facilitate the absorption of watermelon roots. Summer temperatures are high and thunderstorms are common. Fertilizers are applied to the topsoil. Not only is the fertilizer layered and evaporated, but it is also easily washed away by rain. Therefore, a deep hole should be applied between the roots of the watermelon and the soil should be covered immediately after application to improve the fertilizer efficiency.