1, timely ditch drainage. Melting ice and snow, scattered frozen soil, can easily cause obstruction of the field ditch, water damage. Therefore, it is imperative to clear the drains in time to conserve the root system, enhance its ability to absorb nutrients, and ensure its growth and development and recovery of nutrients needed for growth.
2, timely removal of old yellow leaves. After the melting of snow and ice, they grabbed the old yellow leaves that were frozen at the base of the rapeseed, frozen frozen leaves and vegetable moss, and cleared out of the fields to reduce the seclusion of the fields, increase the ventilation and light transmission, reduce the humidity in the field, and promote the growth of the middle and lower branches. To compensate for the loss of frost damage.
3, chase Shi Lei moss. After the ice melts, Shilei bud fertilizer is applied in time, and foliar fertilizer is applied. For the weak rape seedlings that have been frozen, fertilizers should be applied as soon as possible, mainly manure, and the available phosphorus and potassium fertilizers should be appropriately increased. Every day, per acre planted manure 500 to 750 kilograms or 100 grams of potassium dihydrogen phosphate, 50 grams of boron 50 grams of water, in order to promote the growth of rape branches, increase flower bud differentiation and increase seed setting rate. Because of the excessive growth of rape seedlings can not be applied nitrogen fertilizer, should apply appropriate amount of phosphorus and potassium fertilizer, potassium chloride 5 kg per mu or plant ash 50 to 75 kg, superphosphate 7.5 to 10 kg.
4, warming remedy, sprinkle cover. The straw was covered with straw and other crops in a frozen rape field to raise the temperature. Under conditions, 250-300 kilograms of dried straw can be spread evenly between the rows of rapeseeds per acre, and then the dredged soil can be spread on the straw to prevent blowing. The application of grass ash or coke ash in the roots of rapeseed can absorb heat and insulate and buffer cold currents.
5, to strengthen the prevention and control of pests and diseases. After frost damage, the tissues are easily infected by pathogenic bacteria, especially Sclerotinia sclerotiorum. The fungicides such as prochloraz or sclerotinol carbendazim must be sprayed in time, and they should be controlled by fungicides at the early blooming stage and flowering stage. Sclerotinia once each.
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