1. Increased application of phosphorus and potassium fertilizer can promote the development of rape root system and enhance resistance; potassium can improve the cold resistance, disease resistance and lodging resistance of rape.
2. Raise the soil to increase the temperature of the rapeseed field should be plowing the soil, break the soil compaction, improve permeability, and increase the surface soil temperature. The principles are as follows: shallow dry ploughing in dry weather and cold, deep ploughing in soil compaction and dampness; loose soil before rain, hoeing after wet rain; plowing before fertilization, rooting after fertilization, which is beneficial to increase temperature.
3. Cultivate soil and cover fertilizer. When the average daily temperature is 0 ℃, cultivate soil and cover soil between rapeseed rows, large seedlings, bacon, strong seedlings, and small seedlings to cover roots.
4. Irrigation and anti-freeze rapeseed fields are irrigated with water once before the cold current comes, which can stabilize the temperature and supply moisture during wintering of the rapeseed, which effectively prevents dry freezing; irrigation after freezing should be carried out at noon on a sunny day to make the frozen protruding surface soil layer Sink down and make sure that the roots of the rape are in close contact with the soil.
5. Before re-applying wax fertilizer, applying fire ash or soil mixed fertilizer between rapeseed rows can increase the soil temperature by 2 ℃ ～ 3 ℃ and play the role of applying winter and spring hair. Manure, or 2500-3000 kg soil fertilizer.
6. Foliar spraying of rapeseed during the overwintering period. Phosphorus and potassium fertilizers can improve cold resistance, such as potassium dihydrogen phosphate, vitality, and Huimanfeng solution. Spray 0.2% borax solution on boron-deficient rape.
7. Cover the grass to protect the rape before it comes. Cover the rape leaves with a layer of crop stalks to reduce the cold wind directly invading the rape roots. A layer of grass ash can also be spread on the rape leaves.
8. Prevention and control of diseases and insects In order to prevent and control rape aphids, cabbage worms, and beetles, 10 to 15 grams of 10% imidacloprid can be sprayed on water. It can also be used to kill 20 ml of 2.5% enemies and spray 150 kg of water; for rape fields with severe cataplexy disease, carbendazim or tarp can be used for prevention and control.
Nine, management after freezing, check the seedlings in time, find the frozen seedlings, cultivate the soil and help the seedlings in time; remove the water in the field as early as possible in rainy and snowy weather, and avoid waterlogging to hinder the growth of the root system. When thawing, the plant ash is sprayed on the rape in time or the leaves are sprayed with clean water once, which is better for preventing freezing damage and water loss.
(Source: China Fishery News)
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