After the citrus enters the summer dormancy period, 40%-60% of the nutrients in the tree are stored in the leaves. Therefore, it is important for the winter tube to shift from rooting to protecting the leaves. This is not only beneficial to improving the tree's ability to resist cold, but also promotes flower bud differentiation and is beneficial to budding development and flowering effects in the following spring.
1, spray protection leaves. Summer spider mite is one of the causes of abnormal deciduous citrus. The prevention and control of red spiders must be implemented as the main method for protecting leaves. When the number of spiders per 100 leaves invented exceeds 100, 73% of Krypton 1500 times, or 20% of Brooms can be sprayed 1000 times immediately, or 2-3 times the concentration of lime sulfur can be sprayed. . The citrus orchards produced by Citrus trifolii can be contaminated with low concentrations of oil emulsion (2%) and low concentrations of acephate (1500-2000 times).
2, fertilize leaves. After citrus harvest, nutritional deficiency, if not real-time fertilization, some orange orchards can curl up and wither. Because the soil temperature is low, the soil is not suitable for fertilization at this stage, and the foliar spray should be accepted. This is an important method of fertilizing in summer. Spray fertilizer method is to spray once every 10-15 days 0.5% urea plus 0.2% -0.3% potassium dihydrogen phosphate solution, a series of 3-4 times. The amount of fertilizer sprayed is adapted to the conditions of the tree.
3, hormone leaves. Citrus regeneration requires hormones, and this is often neglected by orange farmers. In summer, the temperature is low, and the decomposition in the body can be reduced. No supplements can cause fallen leaves. The foliar spray of Paclobutrazol at a concentration of 500 ppm and 200 ppm of “802 Fluid†can enhance the decomposition of chlorophyll, increase the photosynthetic efficiency, and prevent the leaves from eroding. The dosage and concentration must be strictly controlled during application.
4, trim leaves. Debriding dense branches, interweaving branches, and stacking branches, pruning according to the request for leaving space to be dense, leaving strong and weakening, cutting off the branches of buds and pendent branches, and cutting out pests such as spines, ticks, anthrax, and scab. Badly damaged branches.
5, drought prevention. In the event of drought after entering the winter, it is necessary to accept the principles of drought and water conservation; to accept the method of furrow irrigation or hole irrigation in real time; to uncover the soil in the tree tray and to eliminate the evaporation of the soil moisture; to spray water in combination with foliar fertilizer, in case of rainy stretches, Real-time drainage should be performed.
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