From late August to mid-September, it is the critical period for the coloring of Red Fuji apples. The following six measures can be used to promote apple coloring.
1. Nitrogen control. After September, nitrogen fertilizers are generally no longer applied, and shallow water supply methods can be used to maintain relatively stable soil and air humidity.
2. Pick the leaves. The removal of 1-2 old leaves covered with apples can increase the utilization of direct light.
3. Spray fertilizer. A 0.2%-0.3% potassium dihydrogen phosphate solution was sprayed on the canopy, the total red fruit rate was increased by 15%, the anthocyanin was increased by 1-3 times, the hundred fruit weight increased by 6%, and the yield increased by 20%.
4. Filming. Between the rows and strains of trees, covered with silver reflective film, the fruit in the canopy and in the lower part of the canopy will not be able to see enough light to receive sufficient light, which will significantly increase the coloration of the top of the fruit and the pods.
5. Protect the roots. During the coloring of Red Fuji apples, the tree roots should be avoided and the shallow roots should be destroyed.
6. Late Harvest. The sooner or later harvest will have a greater impact on the coloring and quality of apples. Early harvesting, poor coloring of apple, poor quality, generally 175-180 days after Xiehua harvest time, the closer to the late temperature difference between day and night, the more conducive to fruit coloring.
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