A: July and August are the rapid expansion period of apple fruit. In order to increase the yield and quality of fruit, increase the sugar content and promote coloring, the tree should be supplemented with fertilizer in time. The specific fertilization methods are as follows:
Fertilization time: from early July to early August.
Fertilization varieties and quantity: Phosphorus and potassium fertilizers are mainly used. Each tree is applied with 1 kg of diammonium + 1.25 to 1.5 kg of potassium sulfate or a special fertilizer for fruit trees mainly applied with phosphorus and potassium, and 40 to 50 kg per mu.
Fertilization method: When fertilizing, borrow rain. This year, there are many rains, and it will be applied in time before rain or after rain.
1. Underground topdressing. (1) Radial fertilization: 4 to 6 radial grooves are dug into the crown under the vertical projection of the canopy, the length is 0.5 m to the trunk, the ditch is 15-20 cm, and the groove width is 20 cm. The fertilizer is evenly applied into the ditch and backfilled. (2) Fertilizer application: Dig 6 to 8 small pits each 20 cm long and 20 cm wide and 15 cm deep. Each pit is evenly spread with fertilizer and backfilled. 3, liquid fertilization: the fertilizer is formulated into a liquid, using a fertilizer gun to inject fertilizer under the tree tray.
2. Foliar spray fertilizer. Dilute potassium dihydrogen phosphate, Fuwan potassium and other fertilizers to 0.3% to 0.5% of liquid fertilizer, spray evenly on the leaves, spray both the front and the back of the blade, spray once every 10 to 15 days, even spray 3 times.
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