Key points of fertilization of Hawthorn trees growing Hawthorn

The fertilization period of Hawthorn mainly includes base fertilizer, topdressing in flowering stage, topdressing in the early stage of fruit expansion and topdressing in fruit expansion stage.

The application of base fertilizer. It is best to do it in time after fruit picking in late autumn, which can promote the absorption and accumulation of nutrients and is beneficial to the differentiation of flower buds. The application of base fertilizer is best based on organic fertilizer, combined with a certain amount of chemical fertilizer. The amount of chemical fertilizer is: the nitrogen fertilizer used as base fertilizer generally accounts for about half of the annual application, which is equivalent to the application of 0.25 kg ~ 1.0 kg of urea or 0.7 kg ~ 5.0 kg of ammonium bicarbonate; phosphate fertilizer is mainly used as base fertilizer, accounting for about 80% of the annual application rate, equivalent to 1.0 kg ~ 5.0 kg of calcium superphosphate containing 16% phosphorus pentoxide. Generally speaking, the amount of potassium fertilizer in base fertilizer is 0.25 kg ~ 2.0 kg potassium sulfate or 0.25 kg ~ 1.5 kg potassium chloride. The application amount is determined according to the size of fruit trees and the yield of Hawthorn. Open a 20cm ~ 40cm trench, be careful not to be too close to the tree, first mix the chemical fertilizer with organic fertilizer or soil, and then apply it into the ditch to avoid burning roots.

Topdressing at flowering stage. Mainly nitrogen fertilizer, generally about 25% of the annual application rate, equivalent to 0.1 kg ~ 0.5 kg of urea or 0.3 kg ~ 1.3 kg of ammonium bicarbonate per plant. According to the actual situation, a certain amount of phosphorus and potassium fertilizer can also be applied appropriately. Combined with irrigation, open small ditches to apply.

Topdressing in the early stage of fruit expansion. It is mainly for the early differentiation of flower buds to improve the nutritional conditions, and generally grasp flexibly according to the fertility of the soil, base fertilizer and topdressing at flowering stage. The soil is more fertile, those with more basal fertilizer and topdressing at flowering stage can be applied less or less, the soil is barren, and those with less or no topdressing at flowering stage should be applied properly. The general dosage is 0.1 kg ~ 0.4 kg urea or 0.3 kg ~ 1.0 kg ammonium bicarbonate per plant.

Topdressing during fruit expansion. Mainly potassium fertilizer, combined with a certain amount of nitrogen and phosphorus fertilizer, mainly to promote fruit growth, increase the carbohydrate content of Hawthorn, increase the yield and improve the quality. The amount of potassium fertilizer per fruit tree is generally 0.2 kg ~ 0.5 kg potassium sulfate, combined with 0.25 kg ~ 0.5 kg ammonium bicarbonate and 0.5 kg ~ 1.0 kg calcium superphosphate.

Hawthorn needs less trace element fertilizer, which is mainly provided by organic fertilizer and soil. for example, if more organic fertilizer is applied, trace element fertilizer may not be applied or less, and trace element fertilizer can be applied properly if less organic fertilizer is applied. The actual amount of trace element fertilizer is calculated as base fertilizer: 0.25 kg / mu of borax and 2 kg / mu of zinc sulfate. Manganese sulfate 1 kg ~ 2 kg per mu, ferrous sulfate 5 kg ~ 10 kg per mu (should be applied with high quality organic fertilizer, the ratio of organic fertilizer to iron fertilizer 5:1), micro fertilizer can also be foliar sprayed, the concentration of spraying should be controlled at 0.1% 0.5% according to the aging degree of the leaf, it should be thin when the leaf is young and thicker when the leaf is older.