In the absence of nitrogen in watermelons with nitrogen deficiency, the plants grow thin, grow slowly, and the branches are reduced. The vines are short, the leaves are small and thin, and the leaves are light green or yellow. Symptoms usually develop upward from the old leaves of the base and are significantly premature in later stages. Remedy: Use 10-15 kg of urea per acre (about 20 grams per plant at the seedling stage, 9-15 kg per mu for the extension period; about 15 kg per mu for the melon period) or 400-500 kg of human waste. Shi.
Phosphorus deficient in watermelon lack of phosphorus, plant root development, plant type dwarf, slow growth, small and small leaves, leaf surface dark green luster, the back was purple, flower bud differentiation affected, resulting in late flowering, easy to fall, the result Bad, easy "fructification," decreased sugar content of the pulp, the seeds are not full. Remedial measures: First, use 15-30 kilograms of superphosphate per acre to grow fertilizer; second, use 0.4%-0.5% of superphosphate calcium leachate to foliar spray.
Potassium Deficiency Potassium deficient in watermelon, the plants grow slowly, stem vines are weak, dark and dull leaves, the leaves curled to the back, the lower node blade edge, tip yellow. Symptoms usually develop from the bottom up, causing the heart to become light brown, and even appear to be scorch, resulting in difficulties in fruit setting, small fruit size, reduced sugar content, and reduced quality. Remedial measures: First, use 5-10 kg of potassium sulfate per mu (3 to 5 kg per mu for the seedling period, 8-10 kg per mu for the seedlings) or 30-60 kg for the plant ash; secondly, use 0.4. %-0.5% potassium sulfate solution applied to the foliage.
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