First, do not apply a large amount of nitrogen fertilizer. Watermelon fertilization is most concerned with the combination of nitrogen, phosphorus and potassium. If a large amount of nitrogen fertilizer is applied alone, the plant is very easy to grow, which is not conducive to flowering and melon development. According to the research, the watermelon is mainly absorbed by nitrogen before sitting in the melon. The absorption of potassium after the melon is increased sharply; the demand of nitrogen and potassium is basically equal in the period of depilation of the melon, and the absorption reaches the peak in the expansion stage. At the maturity stage, the amount of absorption is significantly reduced, and the amount of phosphorus absorbed is relatively increased. The ratio of nitrogen, phosphorus and potassium should be 3.8:1:2.8 for seedling period, 3.6:1:1.7 for vine, and 3.5:1:4.6 for melon growth period.

Second, do not apply chlorine-containing fertilizers. Watermelon belongs to the avoidance of chlorine crops. The application of chlorine-containing fertilizers (such as ammonium chloride, potassium chloride, etc.) will affect the accumulation of sugar and make the taste of the melons lighter. Excessive application of human excrement can easily cause the plant to grow long, making it difficult to sit on the melon, and the melon skin is thick and tastes sour.

Third, do not fertilize in the topsoil. Watermelon top dressing should pay attention to deep application, and timely cover soil after application, especially nitrogen fertilizer. If applied, nitrogen is easily volatilized to produce ammonia, which harms the leaves and also reduces fertilizer efficiency. In the rainy weather, the air humidity is high and the soil moisture content is high. At this time, fertilization is not only easy to lose the fertilizer, but also easily causes the watermelon to grow.

Fourth, don't fertilize too close to the roots. The fertilization site of watermelon is generally about 10 cm away from the main root. It is too close to burn roots and affect plant growth. The weather is dry and the soil moisture content is low. At this time, the application of chemical fertilizer will cause the cytoplasmic solution of the root cells to penetrate outward, resulting in the plant being physiologically dehydrated and withered.

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