Pay attention to rape fertilizer
The fertilizing rapeseed is a nitrogen-requiring crop. Under the condition of nitrogen deficiency, the leaf color will turn reddish, especially the winter-type oilseed rape, with large individuals, group footing, strong growth, and high consumption of fertilizer. When the temperature in early spring rises, the growth rate will increase. Accelerated, if the supply of nitrogen is not coordinated with the growth of rapeseed, the yellow color of the leaves will appear, and the early spring will be deterred and affect the spring development. Therefore, according to the situation of rapeseed deficiency, targeted fertilizers can be added. If there is no application of wax fertilizer or the amount of application is insufficient, early application of green manure should be applied. Strive to apply it in early or mid-February. Use 8 kg of urea per acre or 20-25 kg of ammonium bicarbonate to promote spring growth.
The cultivator loosens the soil and fertilizes the seedlings in the middle of the hour to promote the occurrence of secondary roots in the middle and late stages, increase the proportion of new roots, increase the root activity and increase the absorption capacity, and at the same time, it can also improve the resistance of rape in the middle and later stages. .
The top-dressing topdressing fertilizer by extra-root fertilizer can supplement the shortage of nutrients caused by long time of flowering in rapeseed, thus increasing the number of pods and increasing the grain weight. Generally, 0.5% urea aqueous solution and 0.2% to 0.3% potassium dihydrogen phosphate solution 50-60 kg are sprayed per mu. Rape is sensitive to boron, and the application of boron fertilizer to boron-deficient soil is an effective measure to prevent rape from “flowering but not realâ€. Therefore, when urea and potassium dihydrogen phosphate liquid fertilizer are sprayed, borax can be dissolved with warm water first, and then Incorporation into the urea solution and spraying 0.2% to 0.3% borax solution during the flowering stage had a significant effect on increasing the seed setting rate and increasing yield.
Prevention of pests and diseases is an important cause of aggravating the premature failure of rape in early spring. Should pay close attention to the prevention of rape sclerotinia, downy mildew and white rust. In addition to agricultural control measures, Sclerotinia should be sprayed with 40% sclerotium net wettable powder 1000 to 1500 times from the initial stage to full flowering stage. For the prevention of downy mildew and white rust disease, the old leaves and diseased leaves of the base should be removed during the convulsive period. When the plants first see the “leading†symptoms, they are immediately cut off and burned, and sprayed with 50% thiophanate-methyl WP to 800-1000 times. Liquid, once every 5 to 7 days, 2 or 3 times in a row.
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