At the moment, the new shoots of apple trees stop growing and the fruit enters a rapid expansion period. This period is one of the important periods of apple tree nutrition management, and scientific fertilization cannot be ignored.
In this period, supplemented with potassium fertilizer and supplemented with phosphate fertilizer, according to the growth of apple trees and pre-fertilization, appropriate nitrogen supplements were added. Due to the rainy season, apple trees are prone to lack of calcium, magnesium, iron and other elements, so they can be supplemented by foliar application. The specific fertilization recommendations for apple trees during the fruiting period are as follows:
Fertilization variety and quantity
The application of a large amount of elemental fertilizer is mainly based on potassium fertilizer and supplemented by phosphate fertilizer. According to the growth of apple trees, the amount of nitrogen fertilizer is supplemented. Long shoots, thick and strong, thick leaves, thick green leaves, shiny, then strong and strong, it is recommended to apply potassium sulfate 1 ~ 1.25 kg per plant, diammonium phosphate 0.5 ~ 0.7 kg. The long shoots are few, the new shoots are short and thin, the leaves are yellow-green, and the other fruits are smaller than the other fruits at the same time. It is recommended to apply potassium sulfate 1~1.25 kg per plant, diammonium phosphate 0.5-0.7 kg, urea 0.15-0.25 kg. .
The medium and trace elements calcium, magnesium and iron are sprayed on the surface. 1 calcium fertilizer. Timely drainage in the rainy season, timely application of nitrogen fertilizer to promote the absorption of calcium. Appropriate application of lime in acid soil apple orchards can neutralize soil acidity, increase the content of replacement calcium in soil, and alleviate calcium deficiency. For apple trees with severe calcium deficiency, 1000-1500 times of calcium nitrate can be sprayed on the foliage during the growing season. The key part of the spray is apple mites, usually sprayed 1 or 2 times. 2 iron fertilizer. The cause of iron deficiency in apple trees is more complicated. Generally, there is no iron deficiency in the soil. It is because the soil is too alkaline, the organic matter content is too small, the soil is not transparent or the soil is salinized, and the salt content of the surface soil is increased. Iron in the soil cannot be absorbed. Care should be taken to improve the soil, drain, ventilate and reduce saline. Sprayed diandic acid diamine iron 200 times solution or amino acid iron fertilizer or 0.2% ferrous sulfate, ferric citrate plus 0.1% urea or organic chelated iron liquid. 3 magnesium fertilizer. If the magnesium deficiency is light, the leaf surface can be sprayed with 1% to 2% magnesium sulfate solution 1 or 2 times. If the magnesium deficiency is heavy, the magnesium sulfate can be mixed into the organic fertilizer, and the magnesium sulfate is applied in an amount of 1 to 1.5 kg per mu. In acidic soils, magnesium or magnesium carbonate can neutralize soil acidity.
Fertilization method
Ring ditch fertilization method. This method is particularly suitable for applying base fertilizer to apple saplings by digging an annular groove of 30-40 cm wide and 15-25 cm deep at the periphery of the canopy, and then mixing the topsoil with the fertilizer.
Strip groove fertilization method. Between the rows of apple trees or between plants, dig 1 to 2 strips of 50 cm wide and 15 to 25 cm deep, and then fertilize the soil. This method is suitable for mature orchards.
Radiation ditch fertilization method. In a place 1 meter away from the trunk of the apple, 6 to 8 radial grooves are dug, with a width of 30 to 60 cm and a depth of 15 to 25 cm, and the length reaches the outer edge of the trunk. Apply fertilizer to the ditch and cover the soil. This method is suitable for mature orchards. Young trees should be fertilized with annular grooves or radiation ditch, and adult trees should be fertilized with radiation ditch or ditch (ditch between rows or plants).
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