Watermelon planting avoids the application of a large amount of nitrogen fertilizer. The demand for nitrogen, phosphorus and potassium in watermelon is relatively regular. In the fertilization, the combination of nitrogen, phosphorus and potassium should be considered. If a large amount of nitrogen fertilizer is applied alone, the plant is very easy to grow, which is not conducive to flowering melon and fruit. development.
Some experts said that the demand for nitrogen before watermelon is relatively large, can be based on nitrogen fertilizer, the absorption of potassium after the melon is increased sharply, so it is reasonable to choose fertilizer according to the growth habit of watermelon. In the stage of hair removal, the amount of nitrogen and potassium is basically equal. The specific amount is 3.8:1:2.8 for the seedling stage, 3.6:1:1.7 for the vine growing period, and the growth period of the melon is 3.5:1:4.6.
Watermelon fertilization should avoid the use of chlorine-containing fertilizers. Watermelon is a chlorine-free crop. The application of chlorine-containing fertilizers (such as ammonium chloride, potassium chloride, etc.) will affect the accumulation of sugar, make the taste of the melon, and affect the quality of the fruit. Watermelon should pay attention to deep application when fertilizing, and cover soil in time after application, especially nitrogen fertilizer. If applied, nitrogen is easy to volatilize to produce ammonia gas, which harms the leaves and also reduces fertilizer efficiency.
In the rainy weather, it is necessary to avoid fertilization. At this time, the soil has high water content, which is easy to cause the loss of fertilizer nutrients. It is also not used when the soil is dry. Otherwise, it will easily cause the plants to lose water and affect the normal growth of the crops. In addition, it is necessary to avoid root application. When fertilizing, it should be far away from the roots. If it is too close, it is easy to burn roots and affect plant growth.
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