How to manage early spring rape

2022-07-01 0 By

After the start of spring, we should seize the favorable opportunity before sealing up, cultivate soil in the middle tillage, remove weeds, and enhance the resistance of plants to lodging.And combined with intertillage, clean ditch system, ensure “three ditch” unblocked, reduce groundwater level and field humidity, promote root growth, reduce disease, prevent premature senility.The amount of fertilizer absorbed in rapeseed by applying bud fertilizer is large, accounting for about half of the total amount of fertilizer needed. If the reasonable top dressing is done well in this period, the effect of strengthening moss, increasing branches, promoting flowers, adding pods and filling seeds can be achieved.Steady application of nitrogen.Strictly control the application amount of nitrogen fertilizer according to the situation of fertilization in the early stage.For weak seedlings to apply early, heavy application of quick-effect nitrogen fertilizer, generally master six or seven kilograms of urea in mu;For strong seedlings to appropriate late light application, according to mu urea three or four kilograms;To flourishing seedling general do not apply fast effective nitrogen fertilizer, can only apply 1000 kilograms of farmyard fertilizer about mu is appropriate.Increase potash application.The peak period of potassium uptake in rapeseed is from moss extraction from bud to flowering. If potassium was not applied in the early stage, it should be applied in the moss stage to improve the stress resistance of plant, lodging resistance and insect resistance of rapeseed, and increase the yield and quality.Generally, 75 kg – 100 kg potash fertilizer is applied per mu, and the application time is mastered in the middle and late February.Add phosphate and borax fertilizer.Phosphate fertilizer to the root topdressing method to supplement, per mu with calcium superphosphate 1 kg – 1.5 kg water 50 kg immersion day and night, filtrate residue liquid, foliar spraying.Generally spray 2 times, the interval is 5 days – 7 days.Spray borax fertilizer.In the flowering stage of rape bud, spraying borax fertilizer on the leaf surface can prevent the production of “flowering but not fruity” and has a significant effect of increasing production.In the moss period and early flowering period each spray 1 times, each mu with 100 grams of borax, mixed with water 50 kg – 75 kg leaf spray positive and negative.Spray growth regulator.Spray growth regulator in moss stage, use 15% paclobutrazol 30 grams per mu, add 25 kg — 30 kg water evenly spray.It can enhance plant resistance and prevent late lodging.Disease and insect prevention After the beginning of spring, the temperature rises, bacteria and pests began to activity, is a key period for the prevention of diseases and insect pests.In this period, the main control object is sclerotinia, downy mildew, black spot, leaf miner fly, plutella xylostella, aphid and so on.Prevention and control of sclerotium disease: can be used per mu with 50% formica double · sclerotium net wettable powder100 grams, or 40% sclerotium net wettable powder120 grams, or 36% polymycin · amidamide wettable powder35 grams – 40 grams, or 25% propyl ring azole emulsion 25 ml of water 40 kg – 50 kg evenly sprayed.Prevention and treatment of downy mildew:When the rate of disease plant reaches more than 20%, 70% ethyl · manganese wettable powder 500-800 times liquid, or 25% methylenol wettable powder 500-700 times liquid, or 40% ethyl phosphoaluminium wettable powder 200-300 times liquid, or 58% methylenol · mancozeb soluble powder 300 times liquid, once every 7 days to 10 days.Continuous prevention and treatment of 2-3 times.Prevention and control of black spot disease: can spray 75% chlorothalonil wettable powder 600 times liquid, or 64% antitoxic alum wettable powder (oxanling · mancozeb) 500 times liquid, or 50% isoniourea wettable powder 1500 times liquid, or 12% copper-turpentate emulsion 600 times liquid.Prevention and control leaf mycelia, diamond moth: spray 10% cypermethrin emulsion 3000 times liquid, or 5% flufenuron emulsion 1000 times — 2000 times liquid, or 5% flufenuron emulsion 1500 times — 2000 times liquid, or 2.5% cypermethrin emulsion 2000 times — 3000 times liquid;Aphid control is generally controlled with imidazim.Declaration: The copyright of this article belongs to the original author, if there is a source error or infringement of your legitimate rights and interests, you can contact us through the mailbox, we will promptly deal with.Email address: jpbl@jp.jiupainews.com