Do not topdress with chlorine-containing fertilizers. Watermelon topdressing chlorine-containing fertilizers such as ammonium chloride, potassium chloride, etc., due to the influence of chloride ions, will reduce the sugar content of watermelon, so that watermelon taste sour, quality deterioration, should use urea, sulfuric acid Potassium, potassium dihydrogen phosphate and other fertilizers.
Do not chase nitrogen fertilizer partial nitrogen fertilizer can easily cause vines grow crazy, fruit set difficulties. Nitrogen, phosphorus and potassium ternary turbulence in combination with topdressing should be applied to promote the steady growth of quails to improve quality. Generally, every 667 square meters chase urea 16 to 18 kg, high-quality superphosphate 80 to 100 kg or potassium dihydrogen phosphate 30 kg, potassium sulfate 15 kg, chase watermelon special fertilizer effect is better.
Do not top-dress when the top-dressing soil is dry during drought. It will make the cytoplasmic solution of the watermelon root leak outwards, cause the separation of the root cell wall, and can easily cause physiological loss of watermelon vine leaves and wither or even wither. When topdressing in soil moisture is insufficient, top dressing and watering should be carried out at the same time or after watering.
Don't force rainy days and even rainy days with high humidity and high soil moisture. At this time, topdressing will not only result in fertilizer loss, but also lead to leggy, sturdy leaves, and weakened watermelon disease resistance. sick.
Don't go near the seedling and eyelids. The watermelon root spreads to the distance with the extension of the vine. If the top dressing is too close to the seedlings, not only the fertilizer is not fully absorbed, but also it is easy to burn roots. It is advisable to top-dress at a distance of 30 cm from the watermelon seedlings.
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