A. Timely cultivating by cultivating 2 to 3 times of cultivating soil before rape blossoms can not only promote the development of root system and prevent lodging, but also bury bactericidal nucleus and reduce disease. Second, open the drainage ditch to open a drainage ditch, so that the water can row, the dark water can drop, the rain stopped dry. Maintaining good soil permeability is conducive to deep rooting of the rapeseed. Generally, the width and depth of the drains are each 20 cm. Third, reasonable fertilization appropriate control of nitrogen fertilizer application, make-up phosphorus and potassium fertilizer. The seedlings are robust, the stalks grow steadily, and the stalks are hard during flowering. Fourth, timely removal of old yellow leaves late flowering in the late removal of the old yellow leaves, diseased leaves, a few overgrown fields, can be advanced to full bloom. 5. Chemical control 50% carbendazim 800 times, 70% thiophanate-methyl 1000 times, 50% procymidone 2000 times, multi-boron mixture 500 times (25% carbendazim 2 parts) 1 part borax, or 12% green tea cream 600 times spray. The above agents can be used alternately, sprayed once every 5 to 7 days, and sprayed 2 to 3 times. Sprayed on the bottom and stem of rape.
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