Watermelon fertilization points

Watermelon is a kind of strong and adaptable. It can normally bear fruit under low temperature, low light and rainy conditions. Therefore, in addition to being cultivated in open field, it can also be used as a preservative greenhouse, solar greenhouse and other protected areas for cultivation and autumn post-cultivation. Can also be with wheat, Interplanting cotton, oil, spring vegetables and young fruit forests. Due to the adaptability and resistance of watermelon, whether it is floodplain, low hillside, sticky soil, acid soil, alkaline soil, as long as appropriate improvement, deep tillage, more organic fertilizer or Rare earth fertilizers can grow well and obtain high yields. Of course, it is best to have deep sandy loam. Watermelon is a great fruit-yielding varieties, so Shizujifei to win the high yield and quality is particularly important on the basis of nurturing seedlings. The amount of base fertilizer application generally accounts for 60%~70% of the total fertilization amount . For every 1000 kg of watermelon produced, nitrogen ( N ) is 2.5~3.3 kg, and effective phosphorus ( P2O5 ) is 0.8~1.3 kg. Available potassium ( K2O ) 2.9~3.7 kg. The base fertilizer is applied with decomposed organic fertilizer (the best cake fertilizer), and it is combined with nitrophosphate fertilizer 30~40 kg + potassium sulfate 20~25 kg or with phosphorus and potassium phosphate 35~45 kg + potassium sulfate 15~20 kg (sulfur can promote watermelon Sugar accumulation). Before the plants are stretched, the plants can be harvested according to the growth of the plants. May apply phosphorus (potassium) fertilizer 5~10 kg. If the plant grows more prosperous, you can not chase it. Before watering the fruit, you should control the watering to prevent the madness and affect the fruit. In the fruit expansion period, watermelon is the critical period of nutrition, at this time the crop pair The absorption of nitrogen, potassium, calcium and phosphorus reached a peak. In particular, calcium has a great influence on the yield and quality of watermelon. Calcium deficiency in watermelon is prone to roots, rotten roots, curly leaves, small leaves, slow growth, abortion of flower buds, less or less firmness, and cracking Rotten and downy mildew, etc., and choose ammonium, ammonium bicarbonate and other ammonium nitrogen to have anti-allergic effect on calcium (nitrate nitrogen can promote the absorption of calcium by watermelon), so when choosing fertilizer, choose fertilizer containing nitrate nitrogen or Compound fertilizer, the best effect. During the expansion period of watermelon, 15~25 kg of phosphorus nitrate (potassium) fertilizer should be applied to promote the rapid expansion of the fruit.