"Look, the first two snowfalls have killed rapeseed dumplings and leaves. If there is nothing to remedy, it will be empty words to capture the high yield of rape this year ..." On January 31, when the author came to Nanjiang County In the town of Jinluo, the village party branch secretary Wang Min pointed at the frozen rapeseed and sighed. The author immediately called Zhang Da, a senior agronomist and director of the Agricultural Technology Station of the Agricultural Bureau of Nanjiang County. Mr. Zhang said that the frozen rape must be remedied. After the beginning of spring, we must catch up with the rising temperature and hurry to do it. We must do a good job in soil management, fertilization, and disease and insect control before the buds are pumped.
For freezing injury remedy, firstly clear the dead dead leaves and broken stem leaves in time, cut off the frozen moss stalks or break the buds, and spray with chemical fertilizer at the same time. Use 50 g of boron fertilizer, 100 g of potassium dihydrogen phosphate, and carbendazim 150 per acre. G, 50 kg evenly sprayed with water to prevent rape sclerotinia and promote the occurrence of basal shoots. The flowers of the coriander that appeared before winter must be removed in the morning on a sunny day. The time of plucking is generally 5-10 days after the bud. When removing the scab, you can use a small knife to cut off the top of the scab by 1 / 4-1 / 3. It is better to transport the knife with a slant to facilitate the rapid healing of the wound. Quick-acting fertilizer should be applied to pickled rape in a timely manner, and 15 kg of urea or 30 kg of ammonium carbonate or 2000 kg of human and livestock manure and water are poured per acre to irrigate the rape to produce more branches and more horny fruits to ensure the effect of increasing yield.
After cultivating the soil in the spring, we should seize the favorable opportunity before closing the line, cultivating the soil to remove weeds, and enhance the lodging resistance of the plant. Combined with cultivating, cleaning the ditch system to ensure the smooth flow of the "three ditch", reduce groundwater level and field humidity, promote root growth, reduce disease and prevent premature aging.
Shi Lei's fat rape has a large amount of fertilizer absorption during the budding period, which accounts for about half of the total fertilizer requirement. Doing a good job in this period can achieve the effects of strong seedlings, increasing branches, promoting flowers, adding pods, and filling seeds. .
Stable application of nitrogen fertilizer. According to the earlier fertilization situation, the amount of nitrogen fertilizer applied was strictly controlled. For weak seedlings, apply early and re-apply quick-acting nitrogen fertilizers, generally applying six or seven kilograms of urea per acre; for strong seedlings, apply late and light application, applying three or four kilograms of urea per mu; for vigorous seedlings, generally do not apply top-up nitrogen fertilizers. It is advisable to apply only 1000 kg of farm manure per mu.
Increase potassium fertilizer. Bud pullout to flowering period is the peak period of potassium absorption in rapeseed throughout the life. If the potassium application is insufficient in the early stage, it should be increased in the pupal stage in order to improve the plant's resistance to stress, improve the resistance of rape to lodging, disease and insects, and improve Yield and quality. Generally, 75 kg to 100 kg of potassium fertilizer is applied per acre, and the application time is controlled in the middle and late February.
Supplement phosphate and boron fertilizer. Phosphate fertilizer was supplemented by extra-root topdressing. 1 kg of superphosphate per acre was immersed in 1.5 kg of water and 50 kg of water was soaked for one day and night. The filter residue was taken for foliar spraying. It is usually sprayed twice, with an interval of 5-7 days. Spray with boron fertilizer. In rapeseed flowering stage, spraying boron fertilizer solution on the leaf surface can prevent the occurrence of "flowers but not fruit", which has a significant increase in yield. Spray 1 time at the pupal stage and the first flowering stage, each time with 100 grams of borax per acre, spray the front and back of the leaves with 50 kg-75 kg of water.
Spray growth regulator. Spray the growth regulator in the pupal stage. Use 30% 15% paclobutrazol per acre, and spray evenly with 25-30 kg of water. Can enhance the plant's resistance to stress and prevent late lodging.
Pest control After the beginning of spring, the temperature rises and germs and pests begin to move, which is a key period for preventing pests and diseases. The main control objects during this period were sclerotinia, downy mildew, black spot, leaf miner, diamondback moth, aphid, etc.
Prevention and treatment of sclerotinia sclerotiorum: 100 g of 50% Fome Shuang · Sclerotia Net Wettable Powder, or 120% of 40% Sclerotia Net Wettable Powder, or 36% Carbendazim · Imidamide Wettable Powder per acre— 40 g, or 25% propiconazole cream, 25 ml of water and 40 kg to 50 kg of uniform spray.
Prevention and treatment of downy mildew: when the disease rate reaches more than 20%, spray 70% ethyl manganese wettable powder 500 times to 800 times liquid, or 25% metalaxyl wettable powder 500 times to 700 times liquid, or 40% Ethylene Phosphate Aluminum Wettable Powder 200 times to 300 times liquid, or 58% Metalaxyl · Mancozeb soluble powder 300 times liquid, once every 7 days to 10 days, continuous prevention 2 times to 3 times.
Prevention and treatment of black spot disease: It can be sprayed with 600% liquid of 75% chlorothalonil wettable powder, or 500 times liquid of 64% antiviral alum wettable powder (oxazolam and mancozeb), or 50% allazuril wettable powder 1500 times liquid, or 12% copper rosinate 600 times liquid.
Prevention and treatment of leaf miners and diamondback moths: spray 10% cypermethrin EC 3000 times, or 5% flufenoxur EC 1000 times-2000 times, or 5% fluflumizone EC 1500 times-2000 times, or 2.5% Cypermethrin EC 2000-3000 times liquid; aphid control is generally controlled with imidacloprid.
Disclaimer: Some articles on this website are transferred from the Internet. If third party legal rights are involved, please inform this website to deal with them. phone
NINGBO VOICE BIOCHEMIC CO. LTD , https://www.medicine-voice.com