How to Prevent Red Leaves of Rape after Winter

Rapeseed is prone to a large number of red leaves at the seedling stage, which prolongs the period of seedling growth and even forms a stiff seedling, which is difficult to achieve the purpose of winter strong and early-onset. How to prevent the rape leaves in production? First, Qiaofei, steady long hair. After 3 to 5 leaf stage of live rapeseed or survival of transplanting oilseed rape, urea of ​​8 to 10 kilograms can be applied when the soil moisture is good in the rain, or 1,000 to 1,500 kilograms of manure and animal urine of per acre. Promote plant growth and avoid redness due to lack of fertilizer. In addition, 80-120 kg of plant ash can be used in Mushi in the winter season, or foliar application of 0.2%-0.3% potassium dihydrogen phosphate solution to enhance the plant's ability to resist cold and prevent it from appearing cold. Red leaves. Second, early cultivator, earth nursed. After emergence, rapeseed should be cultivated and weeded in a timely manner. Generally, rapeseed cultivating tillage in 3 to 5 leaf stage and cultivating soil protect seedlings, which promotes robust growth of plants. Third, anti-freeze damage, protect the root seedlings. Freezing damage is one of the important reasons why rape leaves appear. Reducing or avoiding the occurrence of frost damage in rapeseed should be based on prevention. The following three measures can be taken on the basis of timely transplanting and cultivating strong seedlings. The first is to apply water and freeze protection at the right time. Drainage irrigation during droughts in winter can not only increase the soil moisture content, ensure the demand of rape oil, but also enhance its cold resistance. The second is to increase phosphate fertilizer and potash fertilizer. Applying organic manure, phosphate fertilizer and potash fertilizer in winter can increase the mechanical organization of rapeseed cytoplasm and enhance its cold resistance. Before the large-scale freezing, the application of concentrated manure water, planting ash, etc., also have a certain degree of antifreeze effect. The third is spraying growth regulators. Spraying 100-150 mg/kg paclobutrazol solution at the seedling stage can cause the petiole to shorten, the leaves thicken, and the leaf color deepen, and can promote the development of the root system and enhance the plant's ability to resist cold. Fourth, anti-worms, timely medication. Aphids are the main pests during the seedling stage of rapeseed, and they are the main vectors for the transmission of viral diseases. If they are not controlled, they will inevitably cause harm, causing the leaves to curl up and deform, and the plants to grow stagnant and stunted, thus easily forming a large number of red leaves. The main pesticides that can be used to control aphids include major heroin and aphid nets.

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