After spring, the rape will enter the "double-wang" period of vegetative growth and reproductive growth. This period of rape needs a large amount of fertilizer, diseases and insect pests, it is particularly important to grasp the field management.
Reuse moss fertilizer
From mid-to-late February to mid-March, when the rapeseed is 6-10 cm high, it is necessary to reapply the moss fertilizer, applying 12-15 kg of ammonium sulfate per mu, or 6-8 kg of urea. For rapeseed that does not produce in the winter, has late growth, or suffers severe frost damage, the seedlings with poor seedlings should be applied early and applied more.
The application of flower fertilization has an important role in improving the rate of scarring, reducing the haze, preventing premature senescence, increasing grain weight, etc., and can apply 3-6 kilograms of urea per acre during the initial flowering period. The growing rapeseed can be sprayed with 0.2% potassium dihydrogen phosphate solution and 0.5-1 kg urea per acre for top dressing.
Spraying boron fertilizer
Lack of boron in rapeseed is the main reason for rape to be "flowering but not real". It can be used to supplement boron fertilizer by applying 0.3-0.6% borax solution during the flowering period of rapeseed, with the amount of 100-200 g per mu.
Timely control of pests and weeds
Qinggou drainage. After the spring of rain, it is necessary to timely clear the ditch, deepen the ditch, reduce the groundwater level and the humidity in the field, and promote the growth of rapeseed roots to prevent premature decline of rapeseed.
Pick old leaves. At the beginning of flowering, the yellow leaves and diseased leaves at the base of the rape stem are removed 2-3 times, and these leaves are taken out of the field and buried deep or burned.
Timely prevention of pests and diseases. Sclerotinia is controlled by 25% Bacteria 1500-2000 times, or 50% isoprenil 1000 times, or 75% procymidone 1000 times, etc.; For the control of downy mildew, 72% can be used 800 times. Liquid, or 72.2% of promemid 600-1000 times, or 65% of Bao Dasen 800 times, etc.; two diseases occur simultaneously, can be used Sprout 500-600 times liquid control. Aphid can be used 3% sprayed 1500 times liquid, or 16.5% smash 1500-2000 times liquid and other control. Plutella xylostella can be used to control 0.6% extermination 1000-1500 times, or 2.5% of Baideli 1000-1500 times, or 5% Trichoderma 3000-4000 times.
Timely control of weeds. For transplanting or weeding rape, weeds can be used to remove weeds. Weeds breed severe fields that can be weeded with chemicals. Weeds with grass-based weeds can be sprayed with 30-50 ml/mu of 5% konjac herb, or 15% finely stewed to spray 30-50 ml/mu; weeds are dominated by dicotyledonous weeds. For the plots, weeds can be sprayed with 50% high-tenk 30-40 ml/mu, or 30% water and 50 ml per mu. Single and dicotyledon weeds can be mixed with the above two types of pesticides to spray weeds.
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