Rapeseed Early Spring Antifreeze Technology
First, the Qinggou soil to prevent waterlogging. Clean up the "three ditch" in time to reduce the humidity in the field and prevent the occurrence of waterlogging. In combination with the ditch, the roots that grow too busy or are too weak are used to root the roots and reduce the damage caused by freezing damage to the root system. Second, remove frozen moss (leaves) to reduce losses. For a small number of rapeseed, early flowering and early-season mosses should be promptly removed and broken. For the already-frozen early moss and early flowering rapeseed, the sunny moss was selected to be removed in a timely manner on sunny days to promote the growth of the rapeseed-based branch and to compensate for the loss of frost damage. When the frozen moss is removed, it should be cut from scissors with 2 cm or less of the dead stem section or cut with a sloping knife, and the frostbite leaves with obvious water-stained shape should be promptly removed to prevent frostbite from affecting the whole plant. Obviously white or dry leaves must be removed promptly. The frozen moss and frozen leaves that have been removed must be cleaned and cannot be left in the rape field. Remove frozen moss and clear dead leaves should not be carried out when the dew is not dry, so as not to cause wound rot. Third, make up the dressing to promote recovery. After the rape was frozen, the leaves and roots were damaged to varying degrees and nutrition must be added in time. After removing the frozen moss, the plots should be subject to 5-7 kg of urea per hectare or a considerable amount of compound fertilizer to promote branch growth. The leaves of frozen rape can be applied with 3 to 5 kilograms of urea or equivalent compound fertilizer per acre. For the poorly growing plots, the amount of topdressing can be increased appropriately to restore growth as soon as possible. Applying potassium fertilizer on the basis of topdressing nitrogen fertilizer can apply potassium chloride 3 to 4 kg per acre, or combine pest control to spray about 500 to 800 grams of potassium dihydrogen phosphate to enhance the plant's ability to resist cold. To promote groats and strong seeds. In addition, 0.1% to 0.2% boron fertilizer solution is sprayed for about 50 kilograms per acre to promote flower bud differentiation. Fourth, prevention and control of pest and disease harvest. After the rape is frozen, the wounds increase, and it is more likely to infect sclerotia and other diseases. It is necessary to strengthen the prediction and forecast of pests and diseases, pay close attention to the dynamics of diseases, and timely spray sclerotin, thiophanate-methyl and mancozeb and other agents for prevention and treatment. .
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