Overwintering rape seedlings new method

In cold weather in winter, in addition to traditional methods, there are the following new methods to ensure safe wintering of rapeseed: 1. Increase phosphorus and potassium fertilizers. Phosphorus can promote the development of rapeseed roots and enhance resistance; Potassium can improve rapeseed resistance to cold, disease resistance and lodging resistance. Raise the application of phosphorus and potassium fertilizers in appropriate amounts at the right time to prevent the plants from being tender and juicy and enhance their ability to resist cold and freeze. 2, warming soil. Rapeseed field should be cultivated with loose soil to remove the surface compaction, improve permeability, and increase surface soil temperature. The principle of loose soil is: cold and shallow cultivation of heaven and earth, wet soil and deep plowing; dry ground before the rain, wet after rain. The cultivating before fertilization, rooting after fertilization, will help the soil warming. 3, soil cover fertilizer. At an average daily temperature of 0°C, the soil between the rows of rapeseed should be soiled with mixed fertilizers. The seedlings should be rooted, strong seedlings cultivated, and the seedlings should be covered with roots. The soil should be crushed with a mature soil, and fine soil can be mixed with some comminuted grass. Coverage, which can steadily and gently reduce evaporation, prevent rapeseeds from directly receiving cold air damage. Soil miscellaneous fertilizer is the source of nutrients in spring, which is beneficial to high yield. 4, irrigation antifreeze. Rapeseed fields are filled with water once before the onset of the cold current, which can provide stable temperature and supply moisture during the wintering of the seedlings, effectively preventing dryness. After the irrigation, the irrigation should be carried out at noon on a sunny day with a cold tail warmer so that the surface of the frozen frost rises. The layer will be solidified to ensure that the roots of the rapeseed are in close contact with the soil, which will help maintain the roots and maintain the roots. 5. Reapply wax fertilizer. Before wintering, topdressing fire-flood ash or earth miscellaneous fertilizer in the rapeseed line can increase the soil temperature by 2-3°C and exert the effect of applying winter spring flowers. Each acre is applied with 1000-1500 kilograms of pig cow manure or 2500-3000 kilograms of soil miscellaneous. organic fertilizer. 6, foliar spray fertilizer. The key to spraying rapeseed before winter rape is to spray phosphorus and potassium fertilizers, which can increase the concentration of cell fluids, lower the freezing point, and enhance cold resistance. During the overwintering period, potassium dihydrogen phosphate, active element and Huimanfeng solution were sprayed, and 0.2% borax solution was sprayed on the boron-deficient rapeseed, which was favorable for freezing and seedling protection. 7, cover grass protection. Before the onset of frost damage, a layer of crop stalks on the leaf surface of rapeseeds can reduce the direct impact of cold wind on the roots of rapeseed; it is also possible to sprinkle a layer of grass ash on the rapeseed leaves to prevent freezing. 8, disease prevention and pest control. Timely prevention and control of rape aphids, cabbage caterpillars, beetles, beneficial seedlings robust growth, generally 10% with 10% imidacloprid water spray; also available 40% omethoate 100 ml and 2.5% enemy killed 20 ml, watered 150 The kilogram spray must be carried out after thawing to prevent damage to the leaves and cause phytotoxicity. In rapeseed field where damping-off and rust are severe, carbendazim or thiophanate can be used for prevention and treatment. 9, control of early death. Early emergence of rape, not only nutrient consumption, but also the ability to resist cold, vulnerable to freezing damage. For early bolting canola, can be sprayed paclobutrazol solution, per acre with 15% paclobutrazol powder 35-50 grams, 55-75 kilograms of water, even spray, control early onset. 10, post-freeze management. After the cold has passed, check the seedlings in a timely manner and find that the frozen seedlings are rooted and the seedlings are raised in time; the rain and snow weather eliminates the accumulation of water in the fields as early as possible to prevent the water from impeding root growth. When thawing, timely spraying of ash on the rapeseed or spraying of fresh water on the leaves can effectively prevent freezing damage and dehydration.

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