Autumn and winter temperatures were higher, rape grew faster, and the birth process was ahead of schedule. Some plants were convulsed in advance. Most of the rapes were affected by heavy snowfall around the Spring Festival. Some stems had frostbite and frozen buds. At present, field rape seedlings generally fall yellow, and the localities must scientifically analyze the dynamics of the seedlings and take practical measures to strengthen field management in the middle and later stages of rapeseed.

First, timely application of pumping fertilizer. The rape must have a large amount of fertilizer when it is convulsed to flower buds. It must be applied stably and reapplied. The application of rapeseed fertilizers to grasp the principle of long-term stability of plants, not premature aging, not greedy green late. Generally in the end of February and early March, urea 7.5-12.5 kilograms of urea per acre or mixed with manure water pouring. For the rapeseed fields with long growing trend, early deflation, and premature senescence, fertilizer was applied to the rapeseed fields. When twitching, the rapeseed fields with large leaves and lower domes were lower than the tip of the leaves. Under high-yielding conditions, the rapeseed plants thrive, and the field where the leaf area is too large should delay the application of manure, which is generally postponed until the rapeseed is about 20 cm high.

Second, clean up the field ditch. For rape fields with no serious trenches in the fields or in the trenches, and to grasp the current opportunity for the rapes to be undisturbed and convenient to operate, combine the weeding roots to clear the field trenches in time to ensure that the rain will stop the fields dry so as to reduce the waterlogging of the rapeseed roots. To promote the root bar.

Third, take the initiative to prevent diseases. Downy mildew and sclerotinia are the main factors affecting the yield and quality of rapeseed. In recent years, rape sclerotinia disease has a greater impact on rapeseed yield, and serious field yield loss is above 50%. All localities should attach great importance to the prevention and control of rapeseed downy mildew and sclerotinia, and do a good job of prevention and control work according to the guidance of the plant protection department.

Fourth, make-up application of fertilizer. Rapeseed is sensitive to boron, and it is necessary to spray boron fertilizer and other trace element fertilizers as an important measure to increase yield of rapeseed, to prevent plants from falling and flowering. Combined rapeseed sclerotinia and downy mildew prevention and control to do a good job of mixed fertilizer spray, generally in the rape pods to the end of full bloom combined spray spraying 0.2% boron fertilizer solution and other fertilizers.

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