A watermelon absorbs 12.39 grams of potassium in the whole life, which is 1.2 times and 3.4 times of ammonia and phosphorus respectively. When potassium is deficient, the plant resistance is reduced, the transduction tissue is weak, nutrient synthesis and transportation are blocked, and then the sugar in the fruit is affected. The accumulation of watermelon has significantly reduced the yield and quality of watermelon. The specific performance is as follows: the plant grows slowly, the stems are weak, the leaves are wrinkled, the edges of the old leaves become brown and die, and gradually expand inward, and in severe cases, they develop to the heart leaves, making them pale green, even the leaves There is also a burnt shape; the fruit setting rate is very low, the melon that has been sitting is small, and the sugar content is not high.
Remedial measures: First, use 5 to 10 kg of potassium sulfate per mu (potassium deficiency in the seedling stage, 3 to 5 kg per mu; 8 to 10 kg per mu after stretching) or 30 to 60 kg of grass ash to bury; Foliar application with 0.4% to 0.5% potassium sulfate solution.
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