Production environment
Select fields with deep plows, fertile and loose soil, good drainage and irrigation, rich in organic matter, and strong in water retention.
2. Production management measures
Selection of varieties In disease-free fields, select robust plants for seed selection. Select seedlings with the characteristics of this variety, no damage, no pests and diseases, uniform size, and a single weight of 5-10g. The reserved shallots will grow 20-25 days more than the commercial shallots, and the leaves shall be harvested after all the leaves have dried up and yellowed in the field. The seed amount is about 70-80kg / 667m2.
3. Site preparation
The plough will be turned to white in mid and late July, and the land preparation will start in early August. The onion will require two plows and two rakes. The rake will be flat and broken. The width of the ditch is 2m, the width of the ditch is 0.3m, the height of the ditch is 0.3m, the ditch is straight, and it is easy to drain and irrigate.
4. Planting
Onions are planted in late July every year, and seedlings are transplanted to the field in late October. Ditch planting, row spacing of 0.25m, plant spacing of 0.2m, density of 10,000 plants / 667m2.
The onion seeds should be cut along the base to remove part of their roots, and the extra leaves should be removed. The onion seeds should be placed close to the soil surface and covered with rotten farm fertilizer such as grass and ash. When the onion seedlings reach 20-30cm in late October, they will be transplanted separately. Only one to two seedlings will be kept in each clump, and the rest will be peeled and transplanted to the field as seed onions. After planting, it should be irrigated in time and moist onion.
5. Field Management
Implemented according to NY / T496-2002. The principle of combining organic fertilizer with inorganic fertilizer and combining base fertilizer with topdressing fertilizer is adopted. The base fertilizer is mainly organic fertilizer, the topdressing fertilizer is mainly compound fertilizer, and the principle of applying diligently and thinly is adhered to.
Base fertilizer: 500-750kg of rotten organic fertilizer and 50kg of superphosphate are applied every 667m2 acres at the time of site preparation and spreading, and mixed with the soil. 15-20kg / 667m2 of compound fertilizer is applied before planting.
Topdressing: 3-4 times, the first time is about 18-20d after plant emergence, when the seedling height is 10cm, compound fertilizer per acre (N: P: K = 15: 15: 15) 7.5-10kg; every 10 After -15 days, the second top dressing was applied with 15-20kg / 667m2 of compound fertilizer; after 10-15d, the third top dressing was applied with 15-20kg / 667m2 of compound fertilizer.
After an interval of 10-15 days, a fourth fertilizer was applied, and a compound fertilizer of 15-20kg / 667m2 was applied depending on the growth. The soil should be kept moist at the seedling stage, but there should be no standing water in the ditch. In case of drought, "horse race water" should be irrigated and seedlings should be irrigated. The irrigation should be carried out once every 5-7 days.
Drain the ditch to dry the field 20 days before harvesting to improve the quality and facilitate the harvest. During the growth and development process, weeding is carried out 1-2 times. Zh
6. Harvest
When the leaves of the plant are senescent and yellow, and the bulbs of the onion become bright red, they can be harvested. When harvesting, you should choose a sunny day, when the soil is relatively dry, and try to avoid mechanical damage. After harvesting, remove the excess fibrous roots in time, and place the picked red shallots in a row for 3 to 5 days. After the onion leaves are yellowed, they are sorted, bundled, graded, packed and labeled.
7. Storage and transportation
The harvested shallots shall be hung in a ventilated, dry, rain-proof and pollution-free place. The transportation tools should be clean and dry, and protected from rain and pollution during transportation.