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Apple's fertilizer requirement and fertilization techniques
(1) Apple's fertilizer requirement law
According to the survey of apple orchards with an output of more than 5,000 kilograms per mu, the ratio of nitrogen, phosphorus and potassium is 2:1:2. Generally, for every 1000 kilograms of fruit produced, nitrogen is required to be 4-7 kg, phosphorus is 2-3.5 kg, potassium is 4-7 kg; Mainly, potassium is the main medium and late stage, and the absorption of phosphorus is relatively stable throughout the year.
(2) Apple's fertilization amount
1 base fertilizer: the most suitable period for base fertilizer application is autumn, that is, after harvesting of middle-ripening varieties, before harvesting of late-maturing varieties, followed by defoliation until freezing, and before thawing to germination in spring. Generally, 3500-4000 kg of fully decomposed organic fertilizer and 50-60 kg of general-purpose compound fertilizer are applied per mu.
2 Pre-flowering fertilizer: The top dressing before flowering is mainly high-nitrogen compound fertilizer (30-10-11), and each plant uses 0.5-1.0 kg of fertilizer.
3 strong fruit fertilizer: you can choose potassium sulfate type compound fertilizer (15-15-15) or high potassium type compound fertilizer (17-6-22), generally 0.5-1.0 kg of fertilizer per plant.
Generally, 0.5% urea is sprayed 2-3 times before germination. After germination until mid-July: once every 7 days, spray twice the ratio of urea to potassium dihydrogen phosphate, the concentration is 0.3-0.5%; after mid-July to the leaves: 2 times phosphoric acid The ratio of potassium hydrogen to primary urea is sprayed at a concentration of 0.3-0.5%. About 20 days before the leaves, spray 0.5% borax + 0.5% urea three times.
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