Taboo 1: Single application of a large amount of nitrogen fertilizer Watermelon fertilization is most concerned about 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 based on nitrogen nutrition before the melon is eaten. The absorption of potassium after the melon is increased sharply; the amount of nitrogen and potassium in the depilation stage of the melon is basically equal, and the absorption of the melon in the expansion stage reaches the peak, the ripening of the melon At the stage, the absorption of nitrogen and potassium decreased significantly, and the absorption of phosphorus increased relatively. The ratio of nitrogen, phosphorus and potassium should be 3.8:1:2.8 for seedling stage and 3.6:1:1.7 for vine growing period. It is 3.5:1:4.6.
Taboo 2: Application of chlorine-containing fertilizers watermelons are taboo chlorine crops. 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.
Taboo 3: Excessive application of human excrement and urine administration of human feces and urine is easy to cause the plant to grow long, making it difficult to sit on the melon, and the melon skin is thick and tastes sour.
Taboo 4: Fertilization in the topsoil should pay attention to deep application, and timely application of soil after application, especially nitrogen fertilizer. If applied, nitrogen is easy to volatilize to produce ammonia, which harms the leaves and also reduces fertilizer efficiency.
Taboo 5: Rainy weather, fertilization, rainy weather, high air humidity, high soil water content, fertilization at this time, not only easy to lose fertilizer, but also easy to cause watermelon grow.
Taboo 6: Fertilization site is too close to the root of the fertilization site of watermelon, generally requires about 10 cm from the main root; too close to easily burn roots, affecting plant growth.
Taboo 7: When the drought is topdressing and drought, the soil moisture content is low. At this time, the application of chemical fertilizer will cause the cytoplasmic solution of the root cells to permeate outward, causing the plant to be physiologically dehydrated and die.
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