Red Fuji apple is a superior fruit with a red color, a delicious taste, and a high value of goods. The use of its inherent characteristics to meet the needs of the market and export, so it is necessary to strengthen the coloring period management.
The coloring of the fruit of Red Fuji is earlier than Guoguang, but it is slow. It usually begins in the middle or late August, but after mid-September, its coloration is not as good as Guo Guang. To improve the coloration degree of Red Fuji, the following measures can be implemented in the middle and mid-September period, in addition to a series of tasks such as pruning and timely control of pests and diseases:
1. After nitrogen control, no nitrogen fertilizer was applied after September, and scientific water supply methods for frequency and shallow irrigation should be adopted to maintain relatively stable soil and air temperature.
2. Picking leaves will remove 1 to 2 old leaves that are hidden above the apple, in order to increase the utilization of direct light.
3. Spraying 500 ppm rare earth on the canopy, the whole red fruit rate increased by 12%, the anthocyanin increased by 1 to 3 times, the hundred fruit weight increased by 6%, and the yield increased by 15%. In addition, Wangshu spray ethephon below 1000ppm or 5000ppm potassium dihydrogen phosphate also have a significant effect of color.
4. Films are laid on the rows of trees and covered with mulching films to increase the intensity of reflected light, significantly increase the coloration of the tops of fruits and pods, and increase the sugar content by 1 to 2 degrees.
5. During the coloring of the Guardian Red Fuji apple, the practice of diligently cutting the tree root and destroying the shallow root system should be avoided, which is beneficial to the synthesis of cytokinin to increase the fruit sugar content.
6. Late harvest time has a great influence on the coloring and quality of apples. The harvest was too early and the apples were poorly colored and of poor quality. Apples generally harvest 175 to 180 days after the harvest. The closer to the late stage, the greater the temperature difference between day and night, the more favorable the fruit coloring. Therefore, it is advisable to harvest Fuji later.
The coloring of the fruit of Red Fuji is earlier than Guoguang, but it is slow. It usually begins in the middle or late August, but after mid-September, its coloration is not as good as Guo Guang. To improve the coloration degree of Red Fuji, the following measures can be implemented in the middle and mid-September period, in addition to a series of tasks such as pruning and timely control of pests and diseases:
1. After nitrogen control, no nitrogen fertilizer was applied after September, and scientific water supply methods for frequency and shallow irrigation should be adopted to maintain relatively stable soil and air temperature.
2. Picking leaves will remove 1 to 2 old leaves that are hidden above the apple, in order to increase the utilization of direct light.
3. Spraying 500 ppm rare earth on the canopy, the whole red fruit rate increased by 12%, the anthocyanin increased by 1 to 3 times, the hundred fruit weight increased by 6%, and the yield increased by 15%. In addition, Wangshu spray ethephon below 1000ppm or 5000ppm potassium dihydrogen phosphate also have a significant effect of color.
4. Films are laid on the rows of trees and covered with mulching films to increase the intensity of reflected light, significantly increase the coloration of the tops of fruits and pods, and increase the sugar content by 1 to 2 degrees.
5. During the coloring of the Guardian Red Fuji apple, the practice of diligently cutting the tree root and destroying the shallow root system should be avoided, which is beneficial to the synthesis of cytokinin to increase the fruit sugar content.
6. Late harvest time has a great influence on the coloring and quality of apples. The harvest was too early and the apples were poorly colored and of poor quality. Apples generally harvest 175 to 180 days after the harvest. The closer to the late stage, the greater the temperature difference between day and night, the more favorable the fruit coloring. Therefore, it is advisable to harvest Fuji later.
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