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Fertilization principle
(1) Adding organic fertilizer and promoting organic and inorganic application; adjusting the amount of nitrogen, phosphorus and potassium fertilizer according to soil fertility conditions and yield level; pay attention to the combined application of calcium, magnesium, boron and zinc.
(2) In the orchard where the base fertilizer has been applied in the autumn, the fruit is not fertilized or fertilized before bagging. In the autumn, the orchard without applying the base fertilizer is recommended to be applied before the germination according to the autumn fertilization suggestion. In the early spring drought-deficient water-producing area, water should be added after fertilization to facilitate nutrient absorption and utilization.
(3) Combined with high-yield and high-quality cultivation techniques, such as ridge cultivating in plain, grass (Bohai Bay) covering (Loess Plateau) technology, drooping fruit branch pruning technology and wall bee pollination technology.
(4) Soil acidified orchards can be modified by applying silicon calcium magnesium fertilizer and lime.
2. Fertilization advice
(1) Orchard with an output of 2,500 kg or less: nitrogen fertilizer (N) 10~12.5 kg/mu, phosphate fertilizer (P2O5) 5~7.5 kg/mu, potash fertilizer (K2O) 12.5~15 kg/mu; per mu yield 2500~4000 kg orchard : Nitrogen fertilizer (N) 12.5~20 kg/mu, phosphate fertilizer (P2O5) 6~10 kg/mu, potash fertilizer (K2O) 15~22.5 kg/mu; per mu yield more than 4000 kg orchard: nitrogen fertilizer (N) 15~22.5 kg/ Mu, phosphate fertilizer (P2O5) 7.5~12 kg/mu, potash fertilizer (K2O) 17.5~25 kg/mu.
(2) Fertilizer is applied in 3~6 times. The first time before and after fruit bagging (late May), NPK combined application, it is recommended to apply 17-10-18 apple formula fertilizer; after mid-June, it is recommended to topdress 2~ 5 times; in the early stage, nitrogen and potassium fertilizers were the main factors, and the amount of potassium fertilizer was increased. It is recommended to apply 20-5-20 formula fertilizer; in the later stage, potassium fertilizer was mainly used, with a small amount of nitrogen fertilizer. Arid and multi-ditch fertilization is recommended in arid areas, and the rainy area can be used for radiation ditching or spreading.
(3) Orchards with zinc deficiency, boron and calcium in the soil, applying 1~1.5 kg of zinc sulfate, 0.5~1.0 kg of borax and 20 kg of calcium nitrate per mu before and after germination; spraying 0.3% borax at the flowering and young fruit leaves, The fruit was sprayed three times with 0.3% calcium fertilizer before bagging. Soil acidified orchard, 150-200 kg of lime per acre or 50-100 kg of siliceous calcium and magnesium fertilizer.
This article URL: Spring 2015 Apple Science Fertilization Technical Guidance
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