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Watermelon topdressing five
Do not pursue the application of chlorine-containing fertilizers, such as ammonium chloride or potassium chloride. Due to the influence of chloride ions, the sugar content of watermelon will be reduced, and the taste of watermelon will become sour and the quality will be deteriorated. Urea and sulfuric acid should be used. Potassium, potassium dihydrogen phosphate and other fertilizers.
Do not look for nitrogen fertilizer and partial nitrogen fertilizer is easy to cause vine leaves to grow wild and difficult to sit. Nitrogen, phosphorus and potassium ternary turbulence should be applied in tandem to promote the steady growth of melons to improve quality. Generally, 16 to 18 kilograms of urea per 667 square meters, 80 to 100 kilograms of high quality superphosphate or 30 kilograms of potassium dihydrogen phosphate and 15 kilograms of potassium sulfate are used.
Do not top dress in the drought when topdressing soil drought, the cytoplasmic aqueous solution of watermelon roots will leak out, causing the separation of root cell wall, which will easily cause the physiological loss of water from the watermelon vine leaves and wither or even die. When the soil is insufficiency, the topdressing should be carried out at the same time as the topdressing and watering.
Do not force the rain even in rainy days, the air humidity is high, the soil moisture content is high, at this time, the application will not only cause fertilizer loss, but also cause the watermelon vine leaves to be long, the leaves are tender and crisp, and the watermelon resistance is weakened. sick.
Don't be close to the seedlings. The roots of the watermelons spread with the spread of the vines. The topdressing is too close to the seedlings. Not only the fertilizer is not fully absorbed, but it is easy to burn. It is advisable to topdress 30 cm away from the eye of watermelon seedlings. (China Fertilizer Network)
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