Lee and Apricot Tree Management After Harvesting

After the fruiting season, plum and apricot trees have consumed a significant amount of nutrients. To restore their vitality and prepare for the next growing cycle, it's essential to apply fertilizers promptly after harvest. This helps improve the leaves' photosynthetic efficiency, supports the tree's recovery, and ensures sufficient nutrients for flower bud development, which is crucial for high yields in the following year. **1. Fertilizer Management** A balanced fertilizer application is recommended. Urea and a phosphorus-potassium compound should be used—approximately 0.3 to 0.5 kg of urea and 0.2 to 0.3 kg of potassium dihydrogen phosphate per tree. Watering after application helps the roots absorb the nutrients more effectively. You can also combine this with foliar feeding by spraying a solution of 0.2% to 0.3% urea and 0.2% to 0.3% potassium dihydrogen phosphate. In addition to chemical fertilizers, organic manure is highly beneficial. It’s best to apply organic fertilizers in mid to late September. Chicken manure, sheep manure, and well-rotted compost are excellent choices. Mixing 1 kg of superphosphate with 20–30 kg of organic fertilizer per tree improves nutrient availability and root absorption. Apply the mixture in open trenches, then water thoroughly. During dry periods, if no rain occurs for 15–20 days, water early or late to prevent drought stress. In rainy seasons, ensure proper drainage. Before winter frost, water deeply to protect the roots from freezing. **2. Pruning Practices** Once the fruit has been harvested, pruning should begin. The key principle is "not too late, not too heavy." Focus on removing dead, crossing, overlapping, or drooping branches. Retain a dorsal branch every 30–40 cm, and remove excess ones early. For the branches you keep, leave 20–30 cm to encourage new growth. After pruning, spray the tree trunks and branches with a disinfectant to protect the wounds and promote healing. **3. Pest and Disease Control** After harvest, common pests include leafhoppers and spider mites, which are most active from July to September. A mixture of imidacloprid (3000 times dilution) and Qi Qi Prime (6000 times dilution) can be effective. Bacterial spot is another major issue during this time. Applying a solution of 10 parts oil, 1 part mancozeb, and 500 parts water helps control both the disease and pests like scale insects and leafhoppers. Adding a new high-fat film to the spray enhances effectiveness and provides broader protection against diseases and pests. **4. Orchard Cleanliness and Tree Protection** After defoliation, it's important to remove fallen leaves, weeds, and rotten fruits. These materials should be buried or burned to reduce the risk of pathogens and pests overwintering. Thoroughly spray the entire orchard, including tree trunks, with a disinfectant. Apply insulation and anti-freeze treatments. Painting the trunks with white wash helps prevent frost damage and kills bacteria. Before painting, scrape off old bark, focusing on the trunk and main branches. Ensure even coverage without dripping or uneven spots. A 3% diluted whitewash is recommended for best results.

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