After the timely control of nitrogen enters September, Red Fuji apple trees can no longer be topdressed with nitrogen fertilizer. In case of dry weather, scientific water supply methods such as drip irrigation, shallow irrigation and frequency irrigation can be adopted, and flood irrigation can not be adopted to maintain a relatively stable soil. And the air humidity is conducive to coloring the red Fuji apple.
Pick leaves and fruit and remove "rosette leaves" that directly contact the fruit surface and leaves that are 5 to 10 cm around the fruit to directly block light to prevent formation of spotted spots. The first time the leaves are picked, about 30% of the leaves should be picked. After entering the first half of October, the second and third times were removed and 50% to 60% of the leaves should be removed. When the leaves were picked, only the leaves were left to retain the petioles, which were performed before 10 o'clock in the morning and after 5 o'clock in the afternoon. The fruit was transferred one week after the leaf was picked, and fruit was transferred 2 to 3 times in the same direction, so that the shade of the fruit also received direct sunlight. For drooping fruit, if there is no place for the fruit to remain fixed, use a transparent tape attached to the appropriate branches near the fixed.
The silver reflective film can be applied 20 days before the picking of the reflective film and from 20 days before picking. Specific laying method: straightening the tree tray along the direction of the anterograde, laying two reflective films on the outside and outside of the tree disk. The outer edge of the film is aligned with the outer edge of the canopy. Compaction of the plastic film with soil can increase the intensity of reflected light and can significantly increase the Color the top of the fruit and pods, and increase the sugar content by 1 to 2 degrees.
Foliar spraying potassium in mid-September to picking, spraying 300 times potassium dihydrogen phosphate 2 to 3 times, the whole red fruit rate can increase about 15%. Leaf spray leaching of grass ash 2 to 3 times, can significantly increase color gain, make the fruit surface bright and clean.
Protecting the tree tray During the period of coloring, red Fuji apples should not be cultivated and flipped to avoid damaging the shallow root system. This is beneficial to the synthesis of cytokinin to increase the sugar content of the fruit and make the fruit red-brilliant and smooth.
Timely picking late October to early November is the best picking period for Red Fuji apples. The microclimate varies from place to place, but it can be advanced or delayed as appropriate. However, it cannot be postponed until late November. Therefore, when the cold air goes south, cold damage can easily occur. Timing can also be picked in time, first picking the crown, the surrounding coloring of good fruit, every 7 to 8 days and then picking the medlar, the lower crown of the fruit, in order to facilitate the fruit of sugar, color, weight gain.
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