One bogey single application of large amounts of nitrogen fertilizer. The fertilization of watermelon is the most concerned with the combination of nitrogen, phosphorus and potassium. If a single application of large amounts of nitrogen fertilizer, the plants are extremely prolonged, which is not conducive to flowering melon and fruit development. Practice has proved that the nitrogen, phosphorus and potassium of the seedling stage should be 3.8:1:2.8, the extension period is 3.6:1:1.7, and the melon growth period is 3.5:1:4.6. Second avoid application of chlorine fertilizer. Watermelon is a chlorine-tolerant crop, and the application of chlorine-containing fertilizer will affect the accumulation of sugar and make the melon taste lighter. Three avoid excessive application of human excrement. Excessive use of human excreta, easily lead to plant growth, making melons difficult, melon skin thick and taste sour. Four bogey top layer fertilization. Pay attention to deep application of watermelon dressing, timely covering after application, especially nitrogen fertilizer, if the table is applied, nitrogen is easily volatilized to produce ammonia gas, harm the leaves, and reduce fertilizer efficiency. Five bogey rainy weather fertilization. Rainy weather has high air humidity and high soil moisture. Fertilizer is not only easy to lose fertilizer, but also can cause watermelons to grow. Six bogey fertilizer sites too close to the root. The fertilization site of watermelon is generally required to be about 10 centimeters from the main root, and it is easy to burn roots if it is too close. Seven bogey fertilizer when avoiding drought. When the weather is dry and the soil moisture content is low, applying chemical fertilizer at this time will make the cytoplasmic solution of the root cells penetrate outward, causing the plant to be physiologically dry and die.
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