Do not topdress with chlorine-containing fertilizers: Watermelon topdressing chlorine-containing fertilizers such as potassium chloride, ammonium chloride, etc., due to the influence of chloride ions, will reduce the sugar content of watermelons, make the watermelon taste sour, quality deterioration. Should use urea, potassium sulfate, potassium dihydrogen phosphate and so on.
Do not apply partial nitrogen fertilizer: Partial application of nitrogen fertilizer can easily cause vine leaves to grow mad, fruit set-up difficulties, should implement N, P, K three elements with top dressing, promote steady growth of quail, improve quality. General acres of urea 16-18 kg, high-quality superphosphate 80-100 kg or 30 kg of potassium dihydrogen phosphate, 15 kg of potassium sulfate or chase watermelon special fertilizer effect is better.
Do not chase concentrated fertilizers during droughts: When the soil is dry, chase concentrated fertilizers, which will infiltrate the cytoplasmic solution of watermelon roots outwards, causing the separation of root cell cytoplasm, which can easily lead to the physiological loss of watermelon vine leaves and wither or even death. In the case of topdressing when there is insufficient soil moisture, topdressing and watering should be performed at the same time or after top-dressing.
Do not apply fertilizer on continuous rainy days: continuous high humidity in the rainy days and high water content in the soil. At this time, topdressing will not only result in loss of fertilizer, but also cause legumes of watermelon vines to grow in length. Leaves are tender and tender, and fruit set-up is not easy. It is extremely easy to get sick.
Don't go near the seedlings and eye-catching fertilizers: The roots of watermelons will spread along with the extension of the vines. Too close to the seedlings from the top dressing will not only fully absorb the fertilizer, but it will burn roots easily. It should be top-dressed at 30 cm away from the seedlings.
Do not spread on the surface: fertilizer spread on the surface, not only reduce the use of fertilizer, but also burn melon seedlings, should be applied deep-recovery or layered topdressing.
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