Each year from August to early October is the initial stage of flower bud differentiation of chestnut. Whether or not it can timely strengthen autumn and winter management after fruit harvesting will directly affect the output of the next year. Give "post-natal fertility." After fruit harvesting, fertilizers should be added in time to restore the tree vigor quickly. Enhance the photosynthetic capacity of leaves to ensure that there are sufficient nutrients for differentiation of flower buds and improve the cold resistance of chestnut trees in winter. Generally, for each 100 kg of chestnut produced, 4.5 to 5 kg of pure nitrogen and potassium, 1.5 to 2 kg of phosphorus, and 8 to 10 years of natural trees are required. About 50 kg of stubble is applied to each ditch, 0.5 kg of urea, 0.2 kg of potassium, and phosphate fertilizer. 1 kg. Chestnut trees more than 10 years old, increase the amount of fertilizer according to the amount of results. Watering drought. After the fruit is harvested, the water loss of the tree body is very large, and it is easy to make the chestnut tree suffer from drought, which causes the branches and leaves to wither and the roots to dry out, affecting the photosynthesis. Therefore, the orchard with conditions after fruit harvesting must be filled with water once in a timely manner. After that, it is necessary to provide timely irrigation in case of drought, and irrigation can be carried out in combination with fertilization. Loose soil cover. After fruit harvesting, it is advisable to deeply plow 20-25 centimeters in the soil within the crown of the chestnut tree and cultivate the soil around the tree base to enhance its ability to resist cold. In the middle and late November of each month, each tree should be sized with 2-3 tons of cooked organic miscellaneous fertilizer, centered on the trunk, and laid under a canopy, and then covered with a layer of fine soil. The next spring, when the temperature rises, it will be dug again to facilitate long-term rooting and reduce weeds. Prevent pests. After harvesting fruits, the leaves of the fruit trees will be cleaned in time and buried in the ground or burned, one will raise trees, and the other will eliminate the source of diseases and insects. The diseases and insect pests of the millet are serious, affecting the tree vigor, mainly powdery mildew and tree cherry bee etc. After the fruit is harvested, it should be sprayed and controlled at a proper time. A thiophanate-methyl or chlorothalonil-free, fast-killing dicamba and other high-efficiency non-residue pesticides should be sprayed; It can be sprayed with times of Bordeaux mixture or 40% omethoate emulsion 1500 times. Reasonably trimmed. While fertilizing the chestnut, it is also necessary to trim the branches in autumn, and reasonably pruning can maintain the tree shape and coordinate vegetative growth and reproductive growth. In the autumn, only the dense branches and the improperly positioned branches of the protuberances are only sparsely cut, and the trees of the fruitful period are dominated by sparse deletions, combined with deflation, maintaining the tree shape, and the aging tree should be retracted in a planned manner, and rejuvenated. , extend the life of the result. It is advisable not to delay the use of autumn shears as soon as possible. Instead, it should be light and heavy, and cut off pests and branches and dead branches to bring them out of the orchard for disposal or burnout.
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