Management of Chestnut expansion period

Fertilizer should be applied in time in summer and autumn, and the roots should be fertilized once a month, mainly nitrogen, phosphorus and potassium. For trees with a yield of more than 50 kg, urea 0.75 kg, potassium dihydrogen phosphate 0.5 kg, potassium dihydrogen phosphate 0.5 kg, nitrogen, phosphorus and potassium compound fertilizer 1 kg, 1.5 kg, sprinkled or 100 kg of clear water were applied after rain.

Cover the tree plate in summer and autumn, cover the tree plate with dry straw or other weeds with a thickness of 8 cm to 10 cm, in order to reduce water loss, keep the soil moist, prevent high temperature and drought weather from harming the underground roots, and improve the root absorption capacity.

The fruit of Castanea mollissima is easily damaged by anthracnose, powdery mildew, dry blight, chestnut moth, chestnut gall wasp, chestnut weevil and so on during the expansion period of chestnut fruit, resulting in a large number of rotten fruit and fruit drop. For this reason, the mixture of 1000 folisbene and 800x methyl topiramate should be sprayed inside and outside the crown once a month, or 1000 times dichlorvos and 600x carbendazim.

Foliar topdressing during the expansion period of chestnut fruit, 0.1% magnesium sulfate, 0.2% urea, 0.3% potassium dihydrogen phosphate, 1500 times Shennong chelate fertilizer mixture, or 800x fruit tree special type Gaomei organic humic acid active liquid fertilizer solution was sprayed every 10 to 15 days, in order to improve the nutritional level of the tree, promote the rapid expansion of the fruit, make the flesh full, and avoid the occurrence of empty buds.