A, onion sowing and seedling management
Sowing time in early to mid-September, transplanting when the seedling age of 50-60 days. Sowing method to sow mainly, can also be furrow sowing. The amount of seed used is 5-6 grams per square meter, with 100-150 grams of seed per 1/15 hectares of field as cold.
Pouring enough water before sowing, 7-8 days after sowing seedlings. Seedlings should be timely inter-seedling, seedling spacing 3 cm. Pay attention to pest control and eliminate weeds.
Two, onion planting how to fertilize
Onion root system is shallow, like fertilizer, you should choose fertile soil, water retention and fertilizer performance of good soil planting.
Generally every 1/15 hectares of high-quality rotting organic fertilizer 4000-5000 kg (organic fertilizer is best to carry out sterilization treatment), potassium sulfate fertilizer 75-100 kg, urea 30 kg, evenly spread on the ground, and then ploughing, ploughing depth of 20-25 centimeters, to fine plowing and harrowing, so that the soil is no dark and bright bumps.
After preparing the ground, start the ridge to form the bed, the width of the ridge is 30-40 cm, the width of the bed is 180 cm, the width of the planting strip is 210-220 cm. Every 1/15 hectares sprinkled 1 kg of groundworm net, cradled flat and suppressed. Spray 100-150 ml of Shidian supplement per 1/15 hectare, and finally cover with mulch.
Three, onion field management
Soil day and night when the freeze water to prevent frost damage. late March, early April, combined with fertilizer watering good green water, 1/15 hectares of urea 15 kg, potassium sulfate fertilizer 15-20 kg. Bulbs began to expand, watering expansion water, 1/15 hectares of urea 8-10 kg, potassium sulfate compound fertilizer 15 kg, can also be sprayed with micro-fertilizer.
Four, onions should be harvested at the right time
20 days before harvest, prohibit the application of any fertilizer, pesticides. When the onion has 1/3 of the leaves yellow, pseudostem flaccid to harvest in due course, harvest to sunny days is appropriate. Harvesting is strictly prohibited collision, and timely drying, try to avoid direct sunlight, and then graded packaging.