After the citrus fruit is harvested, it enters the dormancy period and 40% to 60% of the tree's nutrients are stored in the leaves. Therefore, the protection of the leaves in winter is not only beneficial to enhance the cold resistance of citrus trees, promote flower bud differentiation, but also conducive to the growth and flowering results of citrus next spring.
The spray protection leaves are mainly used to prevent diseases and insect pests, and the focus is on the control of red spiders. Red spider is one of the main causes of abnormal defoliation of oranges. It can be sprayed with 73% of Ketek 1000-1500 times liquid, 50% of Tolke powder 1500-2000 times of liquid or 0.7-0.8 Baume degree of lime sulfur to control It should be sprayed before 10 a.m. and after 3 p.m. Occurrence of Citrus orange arrowhead orange garden, can be used with low concentrations of oil emulsion and acephate 1500 ~ 2000 times mixed spray.
After fertilizing and protecting citrus fruits, the main effect is to restore the tree vigor, increase the accumulation of nutrients in the tree, promote flower bud differentiation and improve the ability of the tree to resist cold in winter. Without timely fertilization, some orange orchards may experience leaf curling and withering. Therefore, citrus fertilizer spray after picking fruit can keep the leaves dark green color, rapid recovery of tree vigor. The fertilization method is to spray 0.5% urea + 0.2% -0.3% potassium dihydrogen phosphate once every 10 to 15 days, and spray 3 to 4 times. The amount of fertilizer to be sprayed should be adjusted according to the conditions of the tree.
Spraying plant growth regulators on foliar surfaces to spray 500 to 1000 mg/kg of paclobutrazol or 200 mg/kg of gastrin 802 can enhance chlorophyll synthesis, increase photosynthesis, and prevent leaf senescence.
Pruning and trimming leaves can improve tree lighting conditions and promote photosynthesis in the leaves. When pruning, according to the principle of leaving sparse density, leaving strength and weakening, cut off the dense branches, dead branches, branches of pests and brooms, and the branches of the periphery of the upper part of the crown.
Drought-resistance, drought-resistance and drought-resistance of leaves can easily lead to dry roots, loss of absorption, increased transpiration of leaves, and cause defoliation. Therefore, in the event of drought after entering the winter, drought and water should be timely. Gully irrigation or hole irrigation can be adopted, and tree-soil loose soil can be used as well as a method of spraying water with a foliar fertilizer. In case of rainy weather, soil waterlogging, and lack of oxygen in the root system, drainage should be conducted in time to prevent a large number of abnormal defoliation.
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