The fruit coloring of Red Fuji apples starts earlier than that of Guo Guang, but the process is slower. Coloring typically begins in late August, and by mid-September, the color development is not as rapid as with Guo Guang. To enhance the red coloration of Red Fuji apples, several effective measures can be taken in early September, in addition to regular tasks like pruning and pest control. 1. **Nitrogen Management**: Stop applying nitrogen fertilizers after September. Implement a scientific irrigation system with frequent, shallow watering to maintain stable soil and air temperatures, which helps promote even color development. 2. **Leaf Thinning**: Remove one or two shaded, older leaves above the apples. This improves light exposure and enhances the efficiency of photosynthesis, leading to better coloration. 3. **Spraying Treatments**: Apply 500 ppm of rare earth elements on the tree canopy. This has been shown to increase the percentage of red fruits by 12%, boost anthocyanin levels by 1 to 3 times, raise fruit weight by 6%, and improve yield by 15%. Additionally, spraying ethephon at concentrations below 1000 ppm or potassium dihydrogen phosphate at 5000 ppm also significantly improves fruit color. 4. **Mulching Film**: Use reflective mulch between tree rows and plants to increase the intensity of reflected light. This enhances coloration on the top and sides of the fruit, while also increasing sugar content by 1 to 2 degrees. 5. **Root Protection**: Avoid cutting or damaging shallow roots during the coloring period. This supports the production of cytokinins, which help improve fruit quality and sugar content. 6. **Delayed Harvesting**: The timing of harvest greatly affects color and quality. Harvesting too early results in poor color and lower quality. Red Fuji apples are generally ready for harvest 175 to 180 days after bloom. The later you harvest, the greater the temperature difference between day and night, which promotes better color development. Therefore, it’s best to delay harvesting as much as possible without compromising fruit maturity. By implementing these practices, growers can significantly improve the appearance, quality, and market value of their Red Fuji apples.

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