1. Reasonable fertilization When the leaf nitrogen content exceeds 2.5% in July, the fruit is poorly colored. Red Fuji is a high-potassium variety. After more application of potash fertilizer in July, the fruit coloring index will increase by 24.4% and the sugar content will increase by 2.4% (absolute value). After the harvest, the base fertilizer will be applied with organic fertilizer, and the organic fertilizer will be human waste and livestock. The manure, poultry, and oil cakes are the best, but they must be fully fermented prior to application. Orchards without the above fertilizers may also be used. It is advisable to apply 1.5 kg of organic fertilizer for each kilogram of fruit produced in the fruit period.
2. Spraying 500kg of rarex solution per kilogram of fruit near the foliar-spraying fruit will increase the coloration of the long-rich 2 apples by 12-17 days, increase the coloring index by 24.2%, and increase the total red fruit rate by more than 5%. The amount of sugar increased by 0.9%-1.6% (absolute value), and increased the sugar-acid ratio of the fruit; According to the Yantai City, Shandong Province test: Red Fuji began spraying photosynthetic fertilizer every 15-20 days since the beginning of leaf stage. Spraying 3-4 times during the whole growth period, the fruit coloring index increased from 37% of the control to 72%.
3. Reflective film under the tree in the middle of August In the middle of August, a one-meter-wide plastic film coated with aluminum foil is placed on the side of the canopy between the branches of the Fuji tree to increase the reflected light and fully color the part of the canopy and the lower part of the crown. . The trees covered with reflective film accounted for 71% of the total number of red fruits and semi-red fruits, and only 40% of the uncoated films.
4, fruit bagging Red Fuji apple has a long growth period, it is best to use double bags. 50 days after flowering, bags were bagged and the bags were removed 30 days before harvesting. Bags should be removed in the evening to prevent sunlight from burning the tender skin of freshly bagged fruits. 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.
5, pick leaves, twist 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 a timely manner to prevent fruit surface leaf spot. 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.
6. Spraying water can wash off the dust on the leaf surface, which will benefit the photosynthesis of the leaves and produce more photosynthetic products. 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 kg of water on an area of ​​1.5 mu, and the dirt on the leaves can increase the amount of water spray as appropriate.
7. According to the author's investigation, the red Fuji apple harvested on October 5 was 10% lower than that harvested on October 25, 25.2% lower in coloration, and 14.9% lower in sugar content (relative value). The ratio of sugar to acid was 15.1. Compared with other late-maturing apple varieties, the fruit growth period of Red Fuji is at least 10-15 days longer. Therefore, Red Fuji should be harvested in eastern Fujian Province until October 25-November 5. In northern Fujian and parts of Liaoning, early autumn frost comes early and harvesting can take place before mid-October.
2. Spraying 500kg of rarex solution per kilogram of fruit near the foliar-spraying fruit will increase the coloration of the long-rich 2 apples by 12-17 days, increase the coloring index by 24.2%, and increase the total red fruit rate by more than 5%. The amount of sugar increased by 0.9%-1.6% (absolute value), and increased the sugar-acid ratio of the fruit; According to the Yantai City, Shandong Province test: Red Fuji began spraying photosynthetic fertilizer every 15-20 days since the beginning of leaf stage. Spraying 3-4 times during the whole growth period, the fruit coloring index increased from 37% of the control to 72%.
3. Reflective film under the tree in the middle of August In the middle of August, a one-meter-wide plastic film coated with aluminum foil is placed on the side of the canopy between the branches of the Fuji tree to increase the reflected light and fully color the part of the canopy and the lower part of the crown. . The trees covered with reflective film accounted for 71% of the total number of red fruits and semi-red fruits, and only 40% of the uncoated films.
4, fruit bagging Red Fuji apple has a long growth period, it is best to use double bags. 50 days after flowering, bags were bagged and the bags were removed 30 days before harvesting. Bags should be removed in the evening to prevent sunlight from burning the tender skin of freshly bagged fruits. 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.
5, pick leaves, twist 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 a timely manner to prevent fruit surface leaf spot. 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.
6. Spraying water can wash off the dust on the leaf surface, which will benefit the photosynthesis of the leaves and produce more photosynthetic products. 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 kg of water on an area of ​​1.5 mu, and the dirt on the leaves can increase the amount of water spray as appropriate.
7. According to the author's investigation, the red Fuji apple harvested on October 5 was 10% lower than that harvested on October 25, 25.2% lower in coloration, and 14.9% lower in sugar content (relative value). The ratio of sugar to acid was 15.1. Compared with other late-maturing apple varieties, the fruit growth period of Red Fuji is at least 10-15 days longer. Therefore, Red Fuji should be harvested in eastern Fujian Province until October 25-November 5. In northern Fujian and parts of Liaoning, early autumn frost comes early and harvesting can take place before mid-October.
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