According to the annual growth of kiwifruit and the law of fertilizer requirement, the four best fertilization schemes for kiwifruit are introduced for reference by fruit farmers.
After the spring soil thawing and sap flow in the early spring followed by precipitating fertilizer, the trees started to move. This period of fertilization is conducive to budding and flowering, and promotes the growth of new shoots. Pregerminating fertilizer should be applied before germination, and mainly available nitrogen fertilizer (nitrogen fertilizer accounts for 1/2-1/3 of the annual nitrogen fertilizer usage), together with a small amount of phosphorus and potassium fertilizers. The 4-year-old tree generally uses 8-10 kg of pure nitrogen, 4 kg of pure phosphorus, and 4 kg of pure potassium. Take the whole garden to spread or plant, apply spring water 1-2 times.
After 30 to 40 days after flowering, the fruit of the kiwifruit is rapidly expanding. At this stage, the fruit grows rapidly and the volume increases rapidly. The lack of fertilizer will hinder the kiwifruit's enlargement. The fruit-promoting fertilizer should be applied 20-30 days after flowering, which is mainly based on quick-effect compound fertilizer. Four-year-old trees can be applied with 0.25-0.3 kg of DAP per plant. After the garden watered the garden once.
In the summer, the topdressing fruit fertilizer is used to enrich the fruit, increase the single fruit weight, and improve the quality. It is advisable to top-dress phosphorus and potassium fertilizers from June to July. In order to make up for the lack of nutrients in the growth of the shoots later, it is also possible to spray the available nitrogen fertilizer 1-2 times. This stage of spraying calcium fertilizer can also enhance the fruit's storability. The main application of this fertilizer is foliar spray. Potassium dihydrogen phosphate 0.5%, urea 0.3%-0.5%, and calcium nitrate 0.5% can be used as fertilizer.
The post-harvest basal planting of the winter-fertilizer loses a lot of nutrients in the leaves after harvesting. At this time, the replenishment of tree nutrients is particularly important. Before spraying, 0.5% urea solution can be sprayed on the foliage to increase the photosynthesis of the leaves, promote the return of nutrients to the roots and stems, and increase the nutrient reserve. In the autumn, Shiji Shi should be used early, mainly consisting of manure, manure, compost, manure, and cake manure, and some quick-acting fertilizers such as superphosphate and ammonium nitrate should be mixed. Usually 4 years old tree plant organic fertilizer 20-30 kg, plus 0.25 kg of superphosphate and ammonium nitrate can be. The whole garden can be applied or applied. Apply water once after application.
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