Rape seedlings tend to appear a large number of "red leaves" phenomenon, so that the rape seedlings extended, or even the formation of a frozen seedlings, it is difficult to achieve the goal of early winter strong. How to prevent and reduce the number of red rape leaves in production?

1, Qiao fertilizer, stable long hair. After three-to-five leaf periods of live rapeseed or survival of transplanted oilseed rape, 8-10 kilograms of urea per acre can be applied after a rain tide, or 1000-1500 kilograms of manure and livestock urine per acre can be used as a seedling fertilizer. Promote the growth of rape, avoid the phenomenon of red leaves caused by lack of fertilizer. In addition, 80-120 kilograms of plant ash can be planted in the middle of the winter season, or 0.2-0.3% potassium dihydrogen phosphate solution can be sprayed on the foliar surface, which can significantly enhance the cold resistance of the plants so as to prevent cold leaves and red leaves.

2, as early as cultivator, soil protection seedlings. After the emergence of rapeseed, we should carry out the cultivating and weeding in time, generally cultivating the loose soil in the three to five leaf stage of rapeseed, and raising the soil to protect the seedlings, so as to promote the roots and more seedlings.

3, anti-freeze damage, protect the root seedlings. The freezing of rapeseed is one of the important reasons for the rape red leaf. To reduce the cold damage of rapeseed, prevention should be the main method. Based on timely transplantation and cultivation of strong seedlings, measures should be taken to prevent freezing damage. One should be timely irrigation antifreeze. In winter drought, diverting irrigation canola can not only increase the soil moisture content, ensure the need of water for rape, but also enhance the ability of rape to resist cold. Second, increase phosphorus and potassium fertilizers. Applying organic fertilizer and phosphorus and potassium fertilizers in winter will increase the cytoplasmic mechanical organization of rapeseed, which can enhance the cold resistance of rapeseed. Before the large-scale freezing, the application of concentrated manure water, planting ash, etc., also have a certain degree of antifreeze effect. Third, spray growth regulators. The application of 100-150 mg/kg growth regulator paclobutrazol at the seedling stage can make the petiole shorter, the leaf color become thicker, the leaves thicken, and it can promote the development of the root system and enhance the cold resistance ability of rapeseed.

4, anti-moth, timely medication. Aphids are the main pests of rape seedlings. If they are not controlled, they will inevitably damage rapeseeds and spread rapeseed virus disease, making rapeseed leaves curl up and deformed, plant growth stagnating and stunting, and thus easily forming a large number of red leaves. Chemical control can be used for big water, spray, etc.

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