Freezing damage is a limiting factor in citrus production. In the northern margin of citrus cultivation, antifreeze nursing work must be strengthened before winter. 1. Fertilization restores tree vigor. Before and after fruit harvesting, use the quick-acting fertilizer to water the roots, combined with foliar spray (0.2%-0.3% potassium dihydrogen phosphate plus 0.5% urea mixture or advanced compound fertilizer), supplement nutrients, prompt rapid restoration of tree vigor, increase nutrition Accumulation, robust growth of trees, enhance cold resistance. After re-application of organic fertilizer insulation. 2, earthworms. After picking the fruit, combine pruning and cleaning the garden, excavate soil and fertilize, select pond mud, river mud, field soil, etc., carry out root-necked tree disc culture with earth 20-30 cm thick, and protect the roots to increase temperature and prevent freezing. 3, irrigation insulation. The drought-producing orchard is fully watered 10-20 days before the low-temperature freezing occurs. The canopy is sprayed during the defrost period, and the water insulation is used to reduce the freezing damage. Therefore, the “anti-freezing water†is irrigated. 4, chemical antifreeze. Before the onset of low temperature, the crown sprayed with chlormequat and steam and heat inhibitors promoted the accumulation of cell sugar, inhibited leaf transpiration, reduced tree heat loss, and reduced the degree of frost damage. 5, soil coverage. Before the advent of cold weather, the land was covered with mulching through cultivation, and soil cooling was reduced to protect the root system from freezing damage. 6, protect the tree. 1 Covering the crown: The entire tree is wrapped in straw and covered with canopy to prevent direct frost damage. 2 protect the main branch: cow dung, yellow mud seal, grass or woven bag wrapped around to reduce the temperature difference and prevent frostbite. 3 Set up a windbreak barrier: Set a 1/3 windbreak at the height of 1 to 20 meters in the vertical direction of the orange orchard and the wind to reduce the wind speed, reduce the evaporation of water and drastically reduce the temperature, and reduce the degree of frost damage. 7, smoke increased temperature. To watch the weather forecast, use fireweed, sawdust, husks, straw, etc., set up 4-6 smoke stacks per acre to ignite and burn smoke before the cold wave arrives or falls, so as to form a smoke screen over the orange orchard to suppress radiation and frost. At the same time, it can directly increase the temperature of the orchard to reduce the damage caused by freezing. China Agricultural Network Editor
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