1. Nitrogen fertilizer should generally be used in the early and late stages of fruit growth, and appropriate combination of phosphorus and potassium fertilizer. Appropriate spraying concentration can effectively promote the growth of new shoots, increase fruit yield, and facilitate flower bud differentiation. The concentration of urea used in the early stage was 0.2%~0.3%, and the concentration in the later stage was 0.3%~0.5%; the concentration of used manure in the early stage was 0.5%, and the concentration in the later stage was 10%.
2. Phosphate fertilizer spraying should master the principle of less in the early stage and more in the middle and later stages. The best effect is ammonium phosphate, the concentration is 0.5%~1%; the concentration of potassium dihydrogen phosphate is 0.2%~0.5%; the concentration of superphosphate leaching solution is 1%~3%.
3. Potassium fertilizer is used in the middle and late stages. It can effectively promote fruit coloration, improve fruit quality and enhance disease resistance. Potassium sulphate and potassium nitrate are used in a concentration of 0.3% to 0.5%; grass ash is added in 5 to 15 kg of water and 0.5 kg. After soaking for 24 hours, the slag can be filtered to spray.
4. Trace elements. The leaves are chlorotic, yellow-white, and can be sprayed 0.3%~0.5% ferrous sulfate solution in half a month during the growing season. It is found that when the fruit is deformed and deformed, and there are dry spots on the outside, 0.3%~0.5% borax solution can be sprayed before and after the next year's flowering.
Spray time
It is best to spray on a semi-yin and windless day. The time should be before 10 am and after 4 pm. The spraying of nitrogen fertilizer during the flowering period can increase the fruit setting rate; the spraying of nitrogen fertilizer in the young fruit stage can promote the expansion of young fruit; the spraying of nitrogen fertilizer in May and June can effectively promote the differentiation of flower buds; the spraying of phosphorus and potassium fertilizer can increase the sugar content and promote the coloration; The elements can be applied before and after the flowering period.
Spray method
Foliar spray can be carried out separately, or it can be sprayed with several fertilizers or mixed with pesticides to save labor. However, mixed spraying should pay attention to the fertilizer or phytotoxicity between the fertilizers or mixed with pesticides. Urea is a neutral fertilizer that can be mixed with a variety of pesticides. Pesticides and fertilizers with different acidity and alkalinity cannot be mixed. For example, various micro-fertilizers cannot be mixed with alkaline fertilizers such as grass ash and lime; zinc fertilizer cannot be mixed with superphosphate. Before mixing the fertilizer with the pesticide, put a small amount of the solution into the same container. If there is no turbidity, precipitation, bubbles, etc., it means that it can be mixed, otherwise it can not be mixed. Foliar spray fertilizer should be applied first and then lower, evenly and carefully, with sprayed leaf back as the main.
The effective period of foliar spray fertilizer is generally only 12~15 days, which needs to be continuous for 2~3 times. Long-term spraying will affect root growth and weaken the physiological function of root system. Therefore, based on soil fertilization, foliar spray fertilizer should be used as one. Auxiliary measures for rapid replenishment of nutrients are applied.
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