1. Open the gap and increase the lighting. From the end of summer, pull and suspend the main branch and keep the main branch at a certain distance. Improve the ventilation and light transmission conditions of the tree and increase the photosynthetic efficiency. From late August to early September, remove the leggy shoots on the backs and canopies from the periphery and overly prosperous and densely blocked light branches, gently cut the young and thin parts of the upper part of the autumn shoots, suppress the growth of autumn shoots, increase the storage nutrients of the trees, and promote Coloring.
Second, rational fertilization Red Fuji apple varieties are hi potassium varieties, after more than 7 months after the application of potash fertilizer, can make fruit coloring index increased by 24.4%, 2.4% increase in sugar absolute value; harvest after the base fertilizer and more manure, livestock manure, The poultry and oil cake cakes are fully fermented before application. Fertilizers can also be applied to orchards without such fertilizers. In the full fruiting period, it is appropriate to apply 1.5 kg of organic fertilizer per kilogram of fruit.
Third, the fruit sprayed with foliar sprayed 500 milligrams of kilogram solution per kilogram near the coloring, and the apple coloring index increased by 24.2%. The total red fruit rate increased by more than 5%, and the sugar content increased by 0.9-1.6%.
Fourth, the tree under the shop reflective film in the Fuji apple tree line between the side of the tree crown shop one meter wide plastic film coated with aluminum foil, can increase the reflected light, so that the canopy and the lower part of the fruit dome full coloring.
5. Fruit bags are bagged 50 days after flowering and bags are removed 30 days before harvesting. Bags should be removed in the evening. First remove all the outer paper bags, and tear the inner bags into umbrellas for 3-5 days. After the fruits are completely adapted to the external environment, remove all the broken inner bags.
Sixth, spray water can wash off the dust on the leaf surface, to facilitate the photosynthesis of the leaves, to create more photosynthetic substances. The squirt spray is also conducive to cooling the tree, increasing the temperature difference between day and night, and promoting the accumulation of sugar in the fruit. The fruit is colored fast and bright. From the beginning of September, fine weather sprays are sprayed onto the foliage every day from 5pm on a sunny day. The clean orchard of the leaves can spray 500 pounds of water on an area of ​​500 acres. The weight of the leaves can be increased if necessary.
Seven, picking leaves, twisting fruit, hanging branches When the fruit sunny side of the color, the shade of the fruit affecting the coloring of the leaves to be removed in time. For the non-colored side of the fruit or the joint surface of two parallel fruit, it should be twisted to the sunny side at the right time. The pillars and hanging sticks should be erected in a timely manner in the later period of fruit growth to prevent coloration due to overlapping, squeezing and sagging of the result branches.
VIII. Proper late receipts According to the survey, the red Fuji apple harvested on October 5 was 10% lower than that harvested on October 25, 25.2% lower in coloration, 14.9% lower in sugar, and 15.1 lower in sugar/acid ratio. Therefore, the suitable collection period for Red Fuji should be in late October.
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