Chestnut Expansion Period Management Methods and Key Points

Timely fertilization In summer and autumn, apply fertilizer to the roots once a month, mainly nitrogen, phosphorus, and potassium fertilizers. For trees with a per-tree yield of 50 kg or more, apply 0.75-1 kg of urea, 0.5-0.7 kg of monopotassium phosphate each time, or apply 1-1.5 kg of nitrogen, phosphorus, and potassium compound fertilizer, broadcast after rain or drenched with 80-100 kg of clean water.

Cover the tree disk In summer and autumn, use dry rice straw or other weeds to cover the tree disk, with a grass thickness of 8-10 cm, to reduce water loss, keep the soil moist, prevent high-temperature and drought weather from damaging the underground root system, and improve root absorption capacity.

Pest and disease control During the chestnut fruit expansion period, it is susceptible to anthracnose, powdery mildew, blight, chestnut fruit moth, chestnut gall wasp, chestnut weevil, and other damage, causing a large number of rotten and fallen fruits. Therefore, spray the canopy inside and out once a month with a mixed solution of 1000x Lorsban and 800x thiophanate-methyl, or a mixed solution of 1000x dichlorvos and 600x carbendazim.

Foliar topdressing During the chestnut fruit expansion period, spray the leaves once every 10-15 days with a mixed solution of 0.1% magnesium sulfate, 0.2% urea, 0.3% monopotassium phosphate, and 1500x Shennongsu chelated fertilizer, or an 800x fruit tree-specific Gaomeishi organic humic acid active liquid fertilizer aqueous solution, to improve the nutritional level of the tree, promote rapid fruit expansion, make the flesh plump, and avoid empty burrs.