Since the beginning of winter last year, cold air activities have been frequent and temperatures are lower than normal. Many rain and snow and freezing weather have occurred. As a result, winter rapeseed growth has been slow, and some plots have been seriously damaged. The proportion of one type of seedlings has declined, and the proportion of second and third seedlings has declined. rise. Spring is the period of rapid growth of rapeseed, and it is also an important period for the formation of yield. Therefore, seizing the favorable opportunity for spring temperatures to rise and strengthening field management is the key to seizing the harvest of rape. Based on the current situation of seedling growth and the characteristics of spring weather, this year's rape field spring field management technical advice.
First, see Miao fertilizer, promote seedling spring early. The late seeding and weak seedlings were used to fertilize the soil, and 5-7 kg of urea was applied to Mushi, which promoted weak growth, promoted flower bud differentiation, and prevented freezing injury and disease.
Second, timely control of pests and weeds. Due to the high rainfall in autumn and winter last year, some fields suffered serious weed damage, and manual weeding or spraying of chemical herbicides to control weed damage was required after sunny weather. In the field of grass-based weeds, we used 10.8% of fluphanopyrrolidine emulsifiable concentrate in 20-30 ml of water to control 50 kilograms of water; in broad-leaved weeds, weeds used 25 acres. - 30 ml water spray control of 50 kg; broadleaf weeds mixed with grass weeds, acres with 17.5% of fine quinolone herb EC 100-140 ml spray control of water 40 kg. In order to improve the effect, the spray should be even and thorough.
Third, the implementation of "a promotion of four prevention", prevent disease and increase production. Last winter, the cold temperature lasted for a long time, and the spring temperature rose rapidly. Sclerotinia disease may be heavier and occurs earlier. Therefore, it is necessary to strengthen the prevention and treatment of Sclerotinia sclerotiorum and early prevention and treatment of sclerotinia. The specific measure is to spray potassium dihydrogen phosphate, boron fertilizer, fungicides and other mixed liquids in the first flowering stage, generally 40% sclerotium net wettable powder or 100 grams of chlorpyrifos, 100 grams of potassium dihydrogen phosphate. Available boron (effective boron content> 20%) 50 grams, spray 30 kg of water. For the second and third types of seedlings, 0.5 kg of urea can be added to the mixed liquid as a fertilizer for foliar supplementation to prevent premature aging of rape.
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