First, control and promote weak strong. For weak rape seedlings, we must increase the use of farmyard fertilizers to promote Miaofei, and properly cooperate with other chemical fertilizers to fight for more roots and more long leaves. Some of the prosperous seedlings should be properly controlled. Before and after the winter solstice, about 10 centimeters of cultivators can be ploughed between rows of rapeseed, and branches can be cut off to improve cold resistance.
Second, increase phosphorus and potassium control nitrogen. Phosphorus can promote the development of rapeseed roots and enhance resistance. Potassium can improve rapeseed's ability to resist cold and lodging. Therefore, in the recovery of fertilization, should be appropriate to increase the amount of phosphorus and potassium fertilizers, reducing the amount of nitrogen fertilizer, so as to avoid the plants are tender and juicy, weak cold resistance, affecting the normal growth of rapeseed.
Third, control the early death of early flowers. Early rape and early flowering of rapeseed not only consumes more nutrients, but also weakens cold resistance and is prone to frost damage. Early morning sickness was found, manual removal and chemical control can be taken, with 15% paclobutrazol 50-75 grams per mu, spraying 50 kg water;
Fourth, cultivator soil. In combination with cultivator, rooting the roots of the soil not only loosens the soil and raises the temperature of the soil, but also protects the root of the rapeseed, which facilitates root growth and prevents lodging of the plant. Earthing should be carried out before freezing, preferably 7-10 cm.
Fifth, reapply farmyard fertilizer. Before winter, covering soil with rapeseed fertilizer, manure fertilizer, human waste, etc. can increase soil temperature by 2-3°C, and it has the effect of protecting against cold, keeping warm, and using winter fertilizer. The time of fertilization is generally suitable from the winter solstice to the Osamu period. Premature application will affect the normal breathing of rapeseed, too late application, the cold effect is not good. Mushi 2000 kg of farmyard manure, or spreading a thin layer of weeds or plant ash, can achieve the desired effect.
Six, pest control. In the seedling stage, when the planting rate reaches about 10%, the mu with 2.5% enemy kills 20 milliliters plus 50% carbendazim 50 grams against water 50-60 kilograms to control aphids and diseases. Before transplanting, 100-120 ml of acetochlor was applied 40%, or 12.5 ml per mu was used after transplanting 50 ml, and 30 kg of water was sprayed to control weeds.
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