Phosphorus and potassium application of phosphorus can promote the development of rapeseed roots and enhance the resistance of plants; potassium can improve the ability of rape cold resistance, disease resistance, lodging resistance. When fertilizing the rapeseed field, the amount of nitrogen fertilizer should be controlled appropriately, and phosphorus and potassium fertilizers should be added to prevent the plants from being tender and juicy, and their ability to resist cold should be deteriorated.
Increase the cover covering rapeseeds with soil fertilizer, grass ash, and crop stalks before winter, so as to maintain the ground temperature relatively stable, reduce the transpiration of the leaves, avoid the direct damage of the cold air to the leaves, and also can 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.
Spraying paclobutrazol on rapeseed fields with early, long-growing, and tendon-seeding trends, spraying paclobutrazol solution at the seedling stage can make the plants dull and prevent or reduce freezing damage. In general, 15% paclobutrazol wettable powder per acre 50 ~ 60 grams, add 60 kg of water spray, pay attention not to spray, not heavy spray.
Foliar spraying rapeseed before winter spraying foliar spray, the key is to spray phosphorus and potassium fertilizers, can increase the cell liquid concentration, reduce the freezing point, and enhance the ability of plants to resist cold. The spraying of 0.2% borax solution on boron-deficient rapeseeds is also beneficial to freeze-proof seedlings.
Controlling early emergence of early rapeseed rape not only consumes more nutrients, but also has weaker cold resistance. For deep-middle-cultivation plots with signs of early onset and early flowering, damage to part of the root system can delay the occurrence of early infestation and early flowering; rapeseed with early inflorescence and early flowering can be picked, and sunny days can be picked at high temperatures. And timely application of available nitrogen fertilizer, promote plant regeneration.
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