Rape is a autumn sowing crop and has a certain ability to resist cold. However, cold air invasion, unscientific species selection, late planting period, improper application of fertilization management measures during winter, and other reasons often cause rape damage, resulting in varying degrees of Reduced production or even no income. Therefore, antifreeze and seedling protection measures must be taken in a timely manner.
Reapply wax fertilizer. The farmer said: “A thousand-thousand-thousand-thousand-thousand-thousand-thousand-thousand-thousand-thousand-thirty-per-one-oil.†The application time of the wax fertilizer is 10-15 days before the winter solstice. Generally, 1200-1500 kilograms of pig manure per acre or 2,500-3,000 kilograms of soil-fertilizer is applied. Can increase the soil temperature 2 °C - 3 °C, play the role of winter spring hair.
The cultivating of loose soil and rooting of soil can improve the soil environment of rapeseed field, regulate the soil moisture, increase the temperature of the soil, prevent lodging, and reduce the harm of grass and sclerotium. The depth of cultivator should be different according to the growth of rapeseed. Generally, it should be shallow and deep, and it should be shallow and shallow for long-term and prosperous, combined with cultivator roots before wintering.
Topdressing thin manure. Before freezing, 600-800 kilograms of manure water per acre is used to increase the concentration of soil solution, so that the soil is not easily frozen, thereby reducing the root freezing damage.
Foliar spraying fertilizer. Spraying potassium dihydrogen phosphate, vigor, etc. during the overwintering period, spraying 0.2% borax solution on the boron-deficient rapeseed, which is beneficial to freezing and seedling preservation.
Increase the cover. Before winter, covering rape seedlings with soil fertilizer, grass ash, crop stalks, etc., can keep the ground temperature relatively stable, reduce the transpiration of the leaves, avoid the direct damage of the cold air to the leaves, and can also bridge the earth seams to prevent air leakage. Such as covering rice straw, 200-300 kilograms per acre, not only protect the antifreeze, but also increase the soil organic matter. The straw that covers the surface of the crop can be naturally implemented in the event of rainfall, and generally does not affect the photosynthesis of rapeseed.
Remedy after freezing. After the cold weather has passed, check the seedlings in time, and rapeseed rooting phenomenon must be smashed in a timely manner to cultivate 8–10 centimeters to prevent rooting. Precipitation in the rain and snow as early as possible to prevent waterlogging in the field, prevent waterlogging from hindering the growth of the roots, disperse wood ash during thawing, and timely spray water on the leaves to ease the imbalance of water and prevent water-dead seedlings; timely patrol of quick-release fertilizer after thawing Branches are promoted and fruiting areas are increased; buds with severed main stems and severely frozen leaves are removed in time.
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