During the cold period in winter, rape is vulnerable to freezing, and there are two common situations. First, Dean raised the seedlings. In the winter, the water in the soil is frozen and the volume expands. The soil layer rises upward and the rapeseed roots are pulled off. The soil was frozen overnight, and the soil was subsidence. The roots of the rape were exposed or broken and the ground was laid down. Crops that are extensively cultivated, or because they are sown late, have small, shallow roots that are prone to this type of frost damage. Second, the leaves were frozen and showed symptoms such as leaf rigidity, shrinkage, and purple. After the rape is frozen, measures should be taken to remedy it as soon as possible. Remedy with fertilizer, timely application of wax fertilizer on the weak rape seedlings have been frozen as soon as possible to apply fertilizer, mainly manure and ammonium bicarbonate, appropriate potassium fertilizer. Every day, every mu Mufen Shi 500 to 750 kilograms, ammonium bicarbonate 15 to 20 kilograms, potassium chloride 5 kilograms or plant ash 50 to 75 kilograms. As a result of excessive growth of rape seedlings can not be applied nitrogen fertilizer, should be appropriate increase in phosphorus and potassium fertilizer, applied per acre 5 kg of potassium chloride or plant ash 50 to 75 kg, superphosphate 7.5 to 10 kg. The shortage of potassium should increase the amount of potash fertilizer, and promote the early recovery of rape seedlings. Warming up and remediating, covering the crops on frozen rapeseed fields covered with straw and other crops to increase temperature. Conditional dry straw 250-300 kg per mu can be spread evenly between rows of rapeseed, so that the mud does not see the sky, the grass does not clump, and then use the dredging soil thinly spread on the straw to prevent blowing off . The application of grass ash or coke ash in the roots of rapeseed can absorb heat and insulate and buffer the invasion of cold currents. Cultivated bauxite, root-soil-enclosed weak-weedseed rape seedlings, and transplanted late rape seedlings, the roots were not well-growth, poor frost resistance, and the roots were not in close contact with the soil and were more susceptible to freezing injury. This part of the rape field should be cultivated, so that the shallow side of the plant, the depth between the rows, combined with the dredging channel system, take the soil root, warming insulation, protect the root growth, but also help prevent late lodging.
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With water remediation, healthy ditch drought and waterlogging can inhibit the growth of rapeseed roots, affect the decomposition and absorption of fertilizers, and should clear the ditch system so that water can be used to adjust fertilizer and gas regulation and promote the recovery of oilseed rape.