Rape winter tube
1. Apply winter fertilizer. Low winter temperatures, application of winter fertilizer can promote root opening, reduce frost damage, but also significantly increase the leaf area of ​​rape, and promote the long leaves of spring. The application period of winter fertilizer is related to the type of fertilizer, and slow-lasting fertilizers such as semi-mature manure, soil miscellaneous fertilizer and compost are generally applied in late December. If human excrement or fertilizer is used, it can be applied in the middle or the middle of January. Generally weak seedlings should be mainly organic fertilizer, which is conducive to controlling the growth of rapeseed nutrition area and enhancing the cold resistance of rapeseed. The application of organic fertilizers such as pig cow dung or earth miscellaneous fertilizers between rows of rapeseed can increase the ground temperature by 2°C-3°C, and can also have the effect of applying winter springs.
Increasing the proportion of P and K in winter fertilizers can increase the thickness of the waxy layer of the leaves. Apply 5~8 kg of potassium chloride and 10 to 15 kg of superphosphate to each acre of ditch. For boron-deficient land, 0.1-0.5 kg of boron fertilizer can also be added to the wax.
Foliar application of phosphate fertilizer can significantly increase the thickness of foliar waxy layer and has a significant effect on cold resistance. Generally due to the low temperature purple leaves, spraying phosphate fertilizer can be converted into normal green 5 days later, and can tolerate -5 °C low temperature invasion. The specific method is to use 2 kg of superphosphate or 0.5 kg of ternary compound fertilizer per mu, soak the soil with 30-40 kg of water for one week and filter out the fertilizer slag, or 200 g of potassium dihydrogen phosphate and 30 kg of water for foliar spraying. , sprayed again every 7 days, spraying the focus of the target is the nitrogen fertilizer appears green field of rape. For lean rapeseed, 0.1-0.2 kg urea can be added to the phosphate fertilizer to promote the growth of rapeseed blades to improve cold resistance.
2. cultivator soil. In the post-emergence combination of fertilization for a cultivator weeding and earthing, can play a loose soil, improve soil ventilation, increase soil temperature, make the soil moisture conditions appropriate, and facilitate nutrient decomposition. At the same time eliminate weeds, reduce pests and diseases, and good development of rapeseed roots can also play a role in thermal insulation. In addition, it also has a positive effect on preventing late lodging. Plant ash is rich in potassium and strong in heat preservation. When the weather suddenly becomes cold, and other measures are too late to be implemented, a layer of turfgrass ash can be sprinkled on the leaves and fields of rapeseed, which can not only protect the leaves, but also increase the heat absorption performance of the soil and increase the soil temperature. .
3. Control pests and diseases. Early prevention and control of rape aphids, cabbage caterpillars and other pests, promote the robust growth of rape, can effectively improve its cold resistance. In general, spraying 80% of dichlorvos emulsion 1000 times per acre can not only kill pests, but also reduce the risk of aphid transmission of rape virus disease.
4. To prevent early death and early flowers. For rapeseed that is sown prematurely, lacks water and fertilizer, and has too high density, rapeseed fields with high temperature, degraded varieties, and late sowing in winter are susceptible to early onset and early flowering in winter. Once they are discovered, they should be immediately removed and topdressed in time. Ammonium bicarbonate 10-15 kg (poured on water) promotes vegetative growth, inhibits reproductive growth, allows plants to rapidly increase leaves, accumulate nutrients, improve cold resistance, and safely survive winter.
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