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After spring, the temperature continues to rise, rapeseed enters a vigorous growth stage, in order to obtain high yield of rapeseed, strengthening field management in the spring is the key and guarantee, the key technology is to do a good job of fertilizer and water management and integrated pest management. First, rational fertilization. After spring, rape enters a period of vegetative growth and reproductive growth. It needs to absorb large amounts of nutrients. Therefore, at this time, scientific fertilization should be carried out based on soil quality, climate, and fertilization before spring, combined with seedling conditions. 1, early application of spring fertilizer: early spring timely fertilizer can remedy the shortage of winter rape, promote more branches, early bud. Especially for rapeseed which has insufficient basal fertilizer and no wax fertilizer, applying topdressing fertilizer in early spring is the key to seizing high yield. Normally, 15-20 kg of ammonium bicarbonate or 6-8 kg of urea per mu is used for dredging water. 2, clever application of fertilizer: Rape bud stage is a critical period of rape rape spring, this time requires a larger amount of fertilizer, accounting for about 50% of the total, for the base fertilizer, wax fertilizer, seedlings weaker, Poorly growing plots should be replanted early, that is, when the loach is about 4 centimeters or so, 800-1000 kilograms of human excrement per acre, urea plus 4-5 kilograms or ammonium bicarbonate 15 kilograms will be applied to the water; For the general or relatively good field, the fertilizer must be applied late and lightly. Generally, when the height of the loquat is more than 13 cm, 150 kg of ammonium excrement per person and 4-5 kg ​​of ammonium bicarbonate should be poured on the water. Deferred premature aging; for autumn, winter hair rape, at this time should control the amount of nitrogen fertilizer, apply less or no nitrogen fertilizer to prevent lodging. 3, spraying boron fertilizer on the leaves: rape "flower but not real" phenomenon, generally caused by lack of boron physiological disease. When rape enters bud stage, it is necessary to pay attention to applying boron fertilizer. The amount of boron required for rapeseeds is large, and it is sensitive to boron. Among them, hybrid rapeseed is more sensitive than conventional rapeseed; late ripening is more sensitive than early maturing; high quality is more sensitive than ordinary. Boron is applied after spring, and it is usually sprayed once during flowering and early flowering. You can choose to do it on a fine sunny day without wind. 100-150 grams of high quality borax per acre (first with a small amount of hot water) spray 50 kg of fresh water. At this time, in order to increase rapeseed seed setting rate, increase grain gain, it is best to use mixed spray of potassium dihydrogen phosphate per acre, especially for growth is not very good. Second, to strengthen the monitoring of pests and diseases and integrated prevention and control work. The main diseases and pests of rape after spring are sclerotia, viral diseases, downy mildew, aphids and cabbage caterpillars, especially Sclerotinia is more common and serious, which has a great impact on the yield. 1. Prevention and control of diseases: Firstly, we should start draining the ditch with gutters and reduce groundwater level before sealing the rows of rapeseed. Second, remove middle and lower old, sick and yellow leaves, and bring them back to the field for destruction to improve the ventilation and light transmission conditions; The third is the early stage of disease, with 25% per acre to 100 grams of 30-40 ml or 22% carbendazim 150-200, 50 carbendazim 150-200 grams, etc. to clear the level of 50 kg fine spray. 2, pest control: for aphids and cabbage caterpillars heavier fields, you can use 10% Dagong Chen or imidacloprid, with 20-30 grams per acre plus 45% efficient hydropermethrin or Antai high green treasure 80-100 grams Such as mixing and timely prevention and treatment, can take good results. 3. Preventing weeds and natural disasters (1) For the failure to effectively eliminate or eliminate severe grassland damage in the fall, the effect should be based on the different phases of the grass. Good to eliminate. For a monocotyledonous weedy heavy field, fine spray of 108 water can be used for efficient spraying of grassy energy or grassweed; for severe grassy fields of dicotyledonous weeds, we can use high-speed knife or good solid control to achieve better results. . (2) For the occurrence of severe weather such as low temperature and rainy weather in spring and winter cold damage, timely forecasting and preventive remedial measures should be made. If the frost damage period of rapeseed is too long, the axillary buds of the leaves will be stiff and the effective branching of the individual plants will be reduced. As a result, the middle and upper branches will be injured, and the normal insemination will not work. The effective number of pods will be reduced, which will directly lead to a reduction in production.