Rape winter seedling protection method
Rape seedlings in winter, can be adapted to local conditions to take cultivator loose soil, cover grass protection, irrigation antifreeze, post-freezing management, reuse of wax fertilizer, foliar spray fertilizer, pest control, control bolting and other measures.
First, the cultivator loose soil: cultivator loose soil can eliminate weeds, eliminate compaction, reduce pests and diseases, increase soil temperature, improve soil permeability, promote root and seedlings robust growth, combined with roots and roots to prevent rapeseed root freezing. Therefore, rapeseed should be intensively cultivated, especially in the event of rain or watering, it should be culled in a timely manner. After the Spring Festival, the last cultivator should be completed, with a depth of 7-10 cm.
Second, cover grass protection: before the onset of frost damage with cover covering in the rapeseed row, can reduce the evaporation of soil moisture, improve drought resistance and antifreeze ability, reduce cold wind damage, covers can choose straw, wheat straw, etc., thickness 6 -8 cm.
III. Antifreeze in Irrigation: Before the onset of the cold current, the temperature is about 5°C, and water is poured once to stabilize the ground temperature to prevent freezing. The rapeseed tillage can be used for furrow irrigation. The water can be poured into the furrow depth of 2/3, and can not be flooded and long-irrigated. In order to avoid the lack of oxygen in the rapeseed roots, irrigation after freezing should be carried out at noon on sunny days so that the topsoil covered by the frozen protrusions is solid, ensuring that the root system and the soil are in close contact with each other.
IV. Post-freezing management: Check the seedlings in time after the cold has flown, and find that the seedlings in the frozen seedlings support the seedlings, and the water in the fields is ruled out as soon as possible in the event of rain and snow.
V. Top dressing for promoting seedling: Between the winter solstice and the Xiaohan, reconstructing wax fertilizer mainly consisting of soil dung, manure, straw ash and earth miscellaneous manure, which can meet the needs of winter rapeseed vegetative growth and reproductive growth, but also It provides nourishment for early postmortem springs, and at the same time it can increase soil temperature, prevent freezing and keep warm, and it has a great effect on alleviating the freezing damage to the seedling root system. When the temperature is higher before winter, the fertilizer can be promptly applied to the seedlings in a timely manner, and the topdressing can be applied alone or in combination with irrigation. Generally, urea 7.5-10 kg or ammonium bicarbonate 15-20 kg, potassium chloride 5-7.5 kg, and 0.5% urea solution are simultaneously applied. , 0.3% potassium dihydrogen phosphate solution, 0.1% borax solution mixture spray, every 5-7 days, once sprayed 2-3 times.
6. Pest Control: In the winter, the temperature will be high, and the locusts will be heavy, resulting in lean and yellow crops, and virus diseases. 100 strains of crickets are more than 500 or field pods are more than 20% of available drugs. Pesticides can be used in 10% alfalfa net 30 grams plus 48% of a new best 20 ml spray, which can prevent aphids, but also cure green or potassium.
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