After planting longan trees, proper management is essential to ensure they enter the fruiting stage within three years. During this period, it's important to time the growth of autumn shoots appropriately, promote the development of strong mother branches, manage winter shoots effectively, and monitor flowering closely to increase fruit set. Additionally, effective pest and disease control is crucial for achieving long-term yield and stable production. The key techniques during the fruiting phase include the following:
1. After the panicle reaches 4-6 cm in length or shortly after thinning, spray a solution of 1000-1500 times diluted polysaponin to encourage robust flower spikes. At the same time, be vigilant about disease and pest control. If red-shooting occurs, manually remove the affected leaves or use Huanong Shoot No. 2 to kill the young leaves on the flower spikes.
2. Baoguo (fruit protection) measures are critical during the fruit development stage:
(1) Within 7-10 days after the female flowers have been pollinated, before the first fruit drop, apply a 920 preservative and add a strong fertilizer. After 10-15 days, apply polyphosphoric acid as a supplement. Alternatively, you can use potassium dihydrogen phosphate at a concentration of 0.2%, combined with regular pest control practices.
(2) Once the fruits have differentiated into large and small sizes, perform a light fruit thinning. Adjust the number of fruits per cluster based on the size of the soybean-like fruits.
(3) After the second physiological fruit drop, apply a high-phosphorus and high-potassium fertilizer to support fruit growth. Combine this with foliar sprays to enhance fruit quality. Throughout this process, continue monitoring and managing pests and diseases to protect the crop.
By following these detailed and well-timed agricultural practices, longan growers can significantly improve both the quality and quantity of their harvests, ensuring sustainable and profitable production.
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