Watermelon deficiency and remedy
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1, nitrogen deficiency syndrome. The nitrogen-deficient plants grow slowly, the stems and leaves are weak, the lower leaves become green, the shoots are shortened between the shoots, and the young grow slowly. 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. 2, Phosphorus deficiency. Phosphorus-deficient plants have poor root development, small plants, purple leaves on the back, and late flowering, and are prone to flowering and "melonating." Remedial measures: First, 15-30 kilograms of superphosphate is used to grow fertilizer; and secondly, 0.4-0.5% of superphosphate calcium leaching solution is sprayed on the leaves. ?? 3, potassium deficiency. Potassium-deficient plants grow slowly, stem vines are weak, leaf surface is wrinkled, the old leaves are browned and dead, and gradually expand inwards. In severe cases, they will develop toward the heart, and even the leaf margins will appear scorch-like; the fruit setting rate is very low. The melons that have been sitting are small, and their sugar content is not high. 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. ?? 4, calcium deficiency. In the absence of calcium, the leaf margins were yellow and dry, and the leaves curled outwards. They were parachute-like. The top part of the plants turned brown and died, and the vines stopped growing. Remedial measures: First, increase the use of gypsum powder or calcium-containing fertilizers, such as superphosphate; second, use 0.2-0.4% calcium chloride solution foliar spray. 5, magnesium deficiency syndrome. In the absence of magnesium, the veins near the main veins of the leaves are first yellowed and then gradually expanded to the surroundings, turning the entire leaves yellow. Prevention and remedial measures: One is to apply 3.5-7 kg of boron-magnesium fertilizer per acre as a base fertilizer; the second is to find magnesium deficiency, and timely spraying with 0.1% magnesium sulfate solution. 6, boron deficiency. In the absence of boron, the new vines become shorter, the vines stand upright, the new leaves become smaller, and the foliage is uneven, with uneven stripes of leaves and leaves. Sometimes it is misdiagnosed as a viral disease, resulting in a loss of production due to lack of symptomatic treatment. Prevention and remedial measures: First, 0.5-1 kg of borax per acre (and appropriate amount of nitrogen and phosphoric acid fertilizer are mixed and applied as base fertilizer) should be applied as the base fertilizer at the site preparation; secondly, the 0.1-0.2% borax solution should be sprayed on the leaves in time. ?? 7, lack of manganese disease. In the absence of manganese, yellow veins between veins are tender, and the main vein is still green, and then it develops into a newly matured large leaf. The seeds are not fully developed and are easily deformed. Prevention and remedial measures: First, apply 1-4 kg of manganese sulfate per acre as a base fertilizer for site preparation; second, soaking seeds with 0.05-0.1% manganese sulfate solution for 12 hours, or mixing 4-8 grams of sulfuric acid per kilogram of melon seeds. Manganese was used as seed fertilizer; Third, it was found that manganese deficiency was promptly sprayed with 0.05-0.1% manganese sulfate solution.