Autumn tube onion do not relax

Summer to autumn, green onion growth into a vigorous stage. At this time, the main goal of management is to promote the rapid growth of leaves, leaf sheath (onion white) elongation, thickening, weight gain, roots robust and stable. The technical measures of field management can be summarized in four agricultural proverbs: first autumn tube onion do not relax, four fertilizer seven water successive attack, three hoe two cultivation row waterlogging, control three diseases and six insects.

One, four fertilizers and seven water successively attack four fertilizers refers to hair fertilizer (early August), mu of high-quality decomposed fertilizer 2000 - 2500 kg, urea 10 kg or ammonium bicarbonate 20 - 25 kg; leaf fertilizer (late August), mu of urea 20 kg or ammonium bicarbonate 40 - 45 kg, potassium carbonate 25 kg; attack sheath (scallion white thickening) fertilizer (early September) mu of urea 15 kg or ammonium bicarbonate 30 - 35 kg, potassium sulfate 20 kg; Heavy sheath (onion white gain) fertilizer (late September), urea 20 - 25 kg or ammonium bicarbonate 40 - 45 kg per mu, such as interplanting@#@245@#@30 - 35 kg calcium superphosphate per mu. Seven water is to irrigate one water each time with four topdressing, and also irrigate one water in the upper, middle and late October respectively to ensure the water for green onion grouting. Water thoroughly and keep the ground moist. At that time, the number of watering times can be appropriately increased or decreased according to drought and flood conditions.

Second, three hoes, two cultivation and drainage of waterlogging, three hoes, that is, in the middle of August, tilling and loosening, eliminating grass waste; deep hoeing at the end of August, base cutting, filling ditches and leveling ridges; hoeing in early September, removing hidden weeds. The two soil cultivation sessions were conducted in mid-September and late September respectively. Cultivate the soil remember not to hurt the leaves, do not bury the heart leaves, so as to facilitate the elongation of onion white, prevent lodging. Autumn season should pay attention to moisture prevention and drainage. Do not accumulate water in onion ditch. In case of sunny and hot weather, pour water to reduce ground temperature. When the surface is slightly dry, it is necessary to immediately loosen the soil and disperse the moisture, ventilate and cool down to prevent "green onion (scallion white rot)".

3. Prevention and control of three diseases, six insects and three diseases, namely downy mildew: spray 80% ethyl phosphorus aluminum wet powder 400 times solution or 72% Pulike aqueous solution 600 times solution. Gray mold: spray 70% mancozeb wettable powder 400 times solution or 50% hydantoin wettable powder 1000 times solution. Purple spot disease: spray 75% chlorothalonil wet powder 500 times liquid or 64% disinfectant alum wet powder 400 times liquid. The six insects, namely leaf miner, leaf miner and thrips, are sprayed with 40.8% Lesben EC 1000 times or 75% Ravine EC 1500 times; cabbage caterpillar (Pieris rapae): sprayed with 0.5% Aragoron EC 1500 times; beet moth: sprayed with 5% Cypermethrin EC 2500 times or 5% Cypermethrin 3000 times and 90% Wanling powder 3000 times; onion maggot (onion fly): Irrigate the damaged areas with 1500 times solution of scallion maggot (50% phoxim EC 250ml +40.8% Lesben EC 250ml) or 7000 times solution of 20% concentrated solvent Kangfuduo along the ridge.