Summarizing the production experience in recent years and promoting the coloring of Fuji apple can be summarized as the following aspects.
First, control nitrogen fertilizer, increase potash fertilizer
Excessive nitrogen fertilizer is not conducive to fruit coloring, and appropriate application of potash fertilizer promotes coloration. Therefore, in the middle and late August, the whole garden was topped with potassium humate; in addition, potassium dihydrogen phosphate or rare earths were sprayed on the leaves and sprayed twice or three times every other month.
Second, control the water and maintain the golden tree potential
Appropriate water control can promote coloration, and the soil water content should be 60-65%. If it is too high, it should not be colored. Moderate tree potential is conducive to coloring, weak tree vigor and over-prosperity are not easy to color. In addition, we must promptly cut off the dense branches and back on the leggy branches, so that the canopy stem transmittance of more than 30%.
Third, the appropriate harvest
Fuji apple is usually harvested 175-180 days after the flower, that is, from late October to early November harvest is better, the later picking, the greater the temperature difference between day and night, the better the coloring.
Fourth, pick leaves and fruit
Remove the 5-10 cm light-blocking leaves around the fruit. The leaf picking work is generally performed in two stages. The first removal is about 30% of the leaves to be picked, and the second picking of leaves is carried out in October. This time, the leaves can be picked with the fruit, and it is better to avoid the morning and the evening. Prevent the fruit from being turned off.
Fifth, spray toner
Note that the sprayed toner should not contain ethephon to prevent fruit drop. (1) Available Baoji apple redner No. 1 2000 times liquid, sprayed once 40 days before and 20 days before harvesting, can increase color 80-90%; (2) can spray PBO (Jiangsu Huaiyin production) 300 times, visible coloration after seven days (3) Naphthalene acetic acid with 30-40 mg/L pre-spray has good color enhancement.
Six, artificial color
Apple coloring depends on the outside temperature and humidity two major factors. Therefore, it is possible to spray water throughout the park in the evening and spray it 2-3 times, which can significantly promote coloring. Can also be placed in the shady ventilated place to put neat fruit, there is a certain gap between the fruit, every morning and evening spray water or 1000 times ethephon, after 3 to 4 days, flip once, and then repeat the water spray, can Achieve full red fruit.
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