Phosphorus deficient: organic fertilizer and inorganic phosphate fertilizer or phosphorus-containing compound fertilizer, spraying 0.2%~0.3% potassium dihydrogen phosphate or Zhixin Huaguobao (high-phosphorus foliar fertilizer) 1500 times during the growth period, even spraying 2~3 Times.
Potassium deficiency: sufficient organic fertilizer in autumn, such as pig manure, cow dung, grass ash, straw manure, etc., to meet the long-term demand for potassium in the growth and development of fruit trees. The expansion of young fruit begins, topdressing potassium sulfate 20~25 kg/mu. Foliar application of 0.2% ~ 0.3% potassium dihydrogen phosphate aqueous solution, or 1% ~ 2% potassium sulfate, or Zhixin (high potassium foliar fertilizer) Digobao 2000 times liquid spray.
Iron deficiency: improving the soil and releasing fixed iron elements is a fundamental measure to prevent yellow leaf disease. In the spring drought, low-salt water is used to infuse alkali and reduce the salt content of the soil. Spray irrigation or drip irrigation cannot be used. Flood irrigation; pay attention to drainage during the rainy season, keep the apple orchard from collecting water, and the soil is well ventilated. The orchard with a heavy weight sprays 0.3%~0.5% ferrous sulfate solution before germination or spray 0.1%~0.2% of ferrous sulfate solution or Shixin high-speed iron 1500~2500 times during the growing season, spraying once every 20 days; or When the 1-3 leaves from the top of the fruit tree and the short shoots begin to lose their green color, spraying ferrous fulvic acid diamine iron 200 times or 0.5% urea plus 0.3% ferrous sulfate has a remarkable effect.
Magnesium deficiency: The application of organic fertilizer can supplement magnesium and reduce the loss of magnesium. In acidic soils, magnesium lime or carbonate can be applied. For magnesium-deficient soils, magnesium sulfate may be mixed into organic fertilizers, and phosphorus, potassium, and calcium fertilizers may be mixed. Spray 1%~2% magnesium sulphate solution 2~3 times in June~July; or use 2%~3% magnesium sulfate or Shixin high-magnesium 2000~2500 times.
Boron deficiency: Expanding the soil and embedding green manure. Apply organic liquid fertilizer such as peanut cake, soybean cake, beef and pig manure, apply compound fertilizer or compound fertilizer, avoid partial application, reapply nitrogen fertilizer and phosphate fertilizer. Pay attention to keep the soil moist and reduce soil loss. In the summer and autumn when there is excessive soil moisture in the rainy season, care should be taken to remove the accumulated water. After defoliation in autumn or before germination in early spring, borax or boric acid may be applied to the fertilization of the fruit tree by using round or radial grooves. Spraying 0.3% borax aqueous solution or Zhixin Boron-calcium-barium 2000 times each before flowering, flowering, and flowering, the effect is quick and the effect is good.
Manganese deficiency: During the leaf growth period, 3% manganese sulfate aqueous solution is sprayed, which needs to be sprayed 3 times. The branches were smeared with manganese sulfate solution or sprayed directly with Shixin Manganese 1500 times.
Calcium deficiency: Increase organic fertilizers and increase calcium absorption in soil. During the growth period, spray Zhixin Bo-calcium 2000-fold solution or Keprepium 2000-times solution in apple young fruit period, before bagging, after bagging and after fruit picking.
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