Farmers figuratively refer to autumn fertilization as “monthly child fat”. Just like a woman’s pregnancy in October, once she has a childbirth, physical and mental health, and nutrient depletion, she has to supplement her nutrition in a timely manner in order to ensure the health of the mother and child. After fruit trees are swollen during the later period, the tree nutrient consumption is empty after harvest. Especially late-maturing apples, if the base fertilizer is not applied in sufficient time after harvesting, the tree's storage and nutrition are seriously deficient. Not only winter and spring will cause rot disease to multiply, but also cause serious damage to the next year's flowering, fruit setting and young fruit cell formation. Effects, resulting in inflorescence is not strong, fruit set rate is low, young fruit head is small, thin and thin new shoots, extended nutrient conversion period. The experimental data show that the fertilization in autumn can increase the fruit setting rate by 8% to 10% and increase the output by 10% to 15% compared with the spring and winter fertilization, and the effect of increasing the yield and improving the quality is very obvious.

Qiu Shiji should pay attention to timeliness, rationality, and scientificity. The fertilization time is usually from September to October. The demand of N, P and K nutrients for apple is 1:0.5:0.7-0.8, and organic fertilizer should be added to supplement the appropriate trace fertilizer. The fertilization method should be fertilization or hole application. The site is on the inside of the outer edge of the canopy; the depth of fertilization is usually concentrated in the root distribution of 20-40 cm. The root project requires the peripheral projection of the tree canopy, and the digging trench is applied shallowly. Generally, the length of the ditch is 150-200 cm, the width is about 40 cm, and the depth is 40 cm.

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