"Winter Ye Mao, Qiu Guo Feng", in order to get high yield and quality of citrus, must first ensure that there are a large number of leaves over the winter trees. The reasons for the loss of leaves in winter are mainly the following: 1. Partial application of nitrogen fertilizer, or excessive nitrogen fertilizer, so that the life of old leaves is shortened and shedding in advance. 2. Before and after fruit harvesting, dry fertilizer is applied, or the amount of water is insufficient, the concentration of fertilizer solution is too high, and the roots and leaves are damaged. 3. After clearing the garden after harvesting fruit, the use of pesticides is too high, and the damage caused by pesticides is caused by falling leaves. 4. In the autumn or early in the winter, it is endangered by cockroaches, cockroaches, leaf miners, anthracnose and other diseases, especially cockroaches, causing leaf quality to decline. Different degrees of leaf loss will occur after winter. 5, wind damage caused by falling leaves. 6, marsh and deciduous. In view of the reasons for the above-mentioned winter deciduous oranges, corresponding preventive measures can be taken. 1 Pay attention to reasonable fertilization. Before and after fruit collection, in addition to urea, apply three-element compound fertilizer, decomposed slag, cake fat, and human and animal fat. 2 Do not dry chemical fertilizers, and use the water flexibly according to the weather. 3 Before and after fruit harvesting, spray 38 percent of rare earth 800 times and 300 times of rice vinegar, which can quickly supplement the life of the leaves and improve the ability to resist drought and freeze. 4 Do a good job of pest control in the fall and early winter, and pay attention to the use of pesticides. In addition, we should pay attention to the orchard infrastructure, dredge irrigation and drainage ditches, leveling the garden soil, so that irrigation can be done by drought and energy, and there is no accumulation of water after the rain.
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