Onion high-yield cultivation management technology
2019-06-09 08:03:51
Planting and planting spring sowing in the end of February to early March, suitable for the frost-free period of more than 200 days; autumn in late September, suitable for the frost-free period of 180 days, after the equinox, 5-6 days or 7-8 days sowing. Appropriate germination temperature is 18°C-22°C, hi cool; about 1.5kg per 667m2, onion seedlings can be transplanted to about 2,000m2 in the field. Avoid heavy smashing, choose 2-3 years did not plant onions, sorghum, garlic land, drainage is good, relatively dry plots. Every 667 square meters of organic fertilizer 5000kg, potassium sulfate 20kg, superphosphate 50kg, applied to the ditch, and deep-turn 20cm, so that the mixed soil. Row spacing 80cm, plant spacing 3-5cm, planting depth to the outside of the onion sprouts fork is appropriate. Planting should be carried out in mid-June in mid-June. The conditions will be as soon as possible after the wheat harvest, but not later than the summer heat.
The field manages small summer heat until the beginning of the autumn for the slow seedling period, do not watering within 15 days after transplanting; break the bottom, prevent compaction, pay attention to flood control. In the event of rain, pour with well water to adjust the temperature. The land is thin and weak and the topdressing nitrogen fertilizer is suitable. From autumn to autumn, it is divided into vegetative growth period, combined with cultivating soil, separate autumn, summer heat, and autumnal 3 times of top dressing and watering. The equinox to the beginning of the winter is a vigorous growth period. In October alone, the amount of growth can account for 40% of the total growth. Therefore, fertilizer and water management should be strengthened during this period, and more fertilizer (a few times more) and water should be used to make the soil dry. The water is usually poured every 5-6 days, and watering is stopped 7-8 days before the onset of spring onions to facilitate storage and transport.
Pest control pests mainly include leafminer, onion thrips, and onion seedlings. The prevention and treatment uses 40% dimethoate 800 times solution or pyrethrin pesticide spray, and 50% phoxim 400 times to irrigate roots; the diseases mainly include purple spot and downy mildew. Disease, gray mold. The use of carbendazim and other bactericidal pesticide sprays.
The field manages small summer heat until the beginning of the autumn for the slow seedling period, do not watering within 15 days after transplanting; break the bottom, prevent compaction, pay attention to flood control. In the event of rain, pour with well water to adjust the temperature. The land is thin and weak and the topdressing nitrogen fertilizer is suitable. From autumn to autumn, it is divided into vegetative growth period, combined with cultivating soil, separate autumn, summer heat, and autumnal 3 times of top dressing and watering. The equinox to the beginning of the winter is a vigorous growth period. In October alone, the amount of growth can account for 40% of the total growth. Therefore, fertilizer and water management should be strengthened during this period, and more fertilizer (a few times more) and water should be used to make the soil dry. The water is usually poured every 5-6 days, and watering is stopped 7-8 days before the onset of spring onions to facilitate storage and transport.
Pest control pests mainly include leafminer, onion thrips, and onion seedlings. The prevention and treatment uses 40% dimethoate 800 times solution or pyrethrin pesticide spray, and 50% phoxim 400 times to irrigate roots; the diseases mainly include purple spot and downy mildew. Disease, gray mold. The use of carbendazim and other bactericidal pesticide sprays.
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