Since the beginning of spring, temperatures have risen, rainfall has increased, and the growth of rapeseed has accelerated. This is another critical period for management to seize high yields and harvests of rapeseed. For this purpose, the following key technical points for field management are proposed:
First, timely clear water management. Spring rains are high, especially in paddy fields due to low topography. If water is not drained in time, waterlogging is very likely to occur, affecting the development of rapeseed roots and causing aggravation of Sclerotinia. Therefore, attention should be paid to clearing the water in time to ensure the smooth flow of the trunk canal. The depths of the three ditches of Xianggou, Yaogou and Weigou shall be deepened step by step to ensure smooth drainage and there is no significant water accumulation on the surface.
Second, due to fertilizer seedlings science. For weak seedlings with small growth volume or rapeseed fields that have been deferred from fertilization, 5 kg of urea plus 1 kg of potassium dihydrogen phosphate may be used for topdressing in order to promote spring growth. For early rape rape fields, it is necessary to control topdressing nitrogen fertilizer so as not to reduce the production of late-maturing lust.
Third, do a good job "a promotion of four defenses." In the late stage of rape growth, it should be combined with the prevention and treatment of Sclerotinia, vigorously promote fertilizer and mixed spray, play a role in promoting the growth and development of rapeseed, anti-flowering, anti-sclerotia, preventing premature aging, anti-high temperature maturing purposes. The specific measure is to spray potassium dihydrogen phosphate, boron fertilizer, fungicides and other mixed liquids at the initial flowering stage, and the proportion per acre is mixed: 40% sclerotium net WP or 100% chlorpyrifos, potassium dihydrogen phosphate 100 grams, quick-acting boron (effective boron content> 20%) 50 grams, motorized sprayer mu fluid volume 12-15 kg, manual sprayer mu fluid volume not less than 30 kg.
Fourth, do a good job of chemical weeding. After the spring, the weeds grow rapidly. In rapeseed fields with grasses and weeds as the main focus, we can use 10.8% of high-efficiency fluphanopyrrolidone EC 20-30 ml watered 50 kg sprayed weed per acre; mainly broad-leaved weeds, Each mu can be used 25-30 ml of eucalyptus and 50 kg of water spray control; broadleaf weeds and grass weeds mixed fields, available 17.5% per acre fine quinolone EC 100-140 ml water 40 kg Spray control; spray to be uniform and thoughtful.
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