The suitable soil moisture of watermelon is 65% -78% of the maximum water holding capacity in the field, and drought symptoms occur when the soil moisture is less than 48%. The requirements of soil moisture for watermelon are high germination period, few seedling period and appropriate extension period. The result is that the middle period is the peak period of water demand, and it is necessary to fully irrigate the water. In the later stage, irrigation should be reduced.
The fertilization of watermelon should be based on the application of base fertilizer, top dressing, in the expansion of the fruit per kilogram of potassium sulfate 3O kg, diammonium 30 kg. Before and after the preparation of the melon, a mixture of 0.2% urea and 0.2% potassium dihydrogen phosphate may be sprayed on the leaves. Observing whether the watermelon lacks fertilizer depends on the color of the leaves. If the base leaves are dark green, the middle leaves are green, and the top leaves are light green, indicating that the growth is normal; if the whole plant is yellow-green from the top to the bottom, it indicates lack of fertilizer; if the leaves color It is dark green from top to bottom, indicating that excessive nitrogenous fertilizer can cause madness and need attention.
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