What is the law of kiwifruit fertilizer? how to fertilize kiwifruit scientifically?

The four best fertilization schemes of kiwifruit are formulated according to the annual growth and fertilizer requirement of kiwifruit, which can be used as a reference for fruit growers.

Fertilization of kiwifruit

Topdressing sprouting fertilizer in early spring: after soil thawing and sap flow in spring, the tree began to move, and fertilization in this period promoted sprouting, flowering and new shoot growth. Sprouting fertilizer should be applied before germination, mainly quick-acting nitrogen fertilizer (nitrogen fertilizer accounts for 1 / 2-1 / 3 of the total amount of nitrogen fertilizer used in the whole year), with a small amount of phosphorus and potassium fertilizer. 4-year-old kiwifruit trees generally apply 8-10 kg of pure nitrogen, 4 kg of pure phosphorus and 4 kg of pure potassium per mu. Sprinkle or plant application in the whole garden, and irrigate spring water 1-2 times after application.

Application of fruit-promoting fertilizer after anthesis: 30-40 days after falling flower is the period of rapid expansion of kiwifruit. In this stage, kiwifruit grows rapidly, its volume increases rapidly, and lack of fertilizer will hinder the expansion. Fruit-promoting fertilizer should be applied 20-30 days after falling flower, mainly quick-acting compound fertilizer. 4-year-old rhesus monkey peach trees were given diammonium phosphate 0.25-0.3 kg. After application, the whole garden was watered once.

Application of strong fruit fertilizer in midsummer: in order to enrich the interior of kiwifruit, increase the weight of single fruit and improve the quality, it is appropriate to apply phosphorus and potassium fertilizer once from June to July. In order to make up for the lack of nutrition of shoot growth in the later stage, quick-acting nitrogen fertilizer can also be sprayed 1-2 times. Foliar spraying calcium fertilizer in this period can also enhance the storability of kiwifruit. The fertilizer is mainly foliar spraying, and the fertilizer can be used with 0.5% potassium dihydrogen phosphate, 0.3% Mel 0.5% urea and 0.5% calcium nitrate.

Postharvest basic application of overwintering fertilizer: after fruit harvest, the leaves lose a lot of nutrients, so it is particularly important to replenish nutrients to the trees. 0.5% urea solution was sprayed on the leaf surface before defoliation to increase leaf photosynthesis, promote the return of nutrients to roots and stems, and increase nutrient storage. It is advisable to apply basic fertilizer early in autumn, mainly with manure, compost, compost, barnyard manure, cake fertilizer and other organic manure, and mixed with appropriate amount of available fertilizer such as calcium superphosphate, ammonium nitrate and so on. General 4-year-old rhesus monkey peach trees apply 20-30 kg of organic fertilizer, plus 0.25 kg of calcium superphosphate and ammonium nitrate. It can be spread in the whole garden or in a ditch. Irrigate once after application.