I. Cultivation environment:
The onions are cold and more heat-resistant and can be grown over four seasons. The maximum growth temperature is 18 °c-23 °c, with a shallow distribution of roots, low water demand, drought resistance and suitable for cultivation in sandy soils. The light strength requires a moderate level, with a high degree of aging and poor quality. Water, soil and atmospheric quality should be consistent with non-hazardous land requirements。
Time of planting:
Spring spring: planting in january, harvest in mid-april, membrane cover for the morning。
Summer: replanting in late april to early june, harvest in may-end july. This can be used to plant the sunnets or set them in high-dry crops to supply the “summer” market。
Autumn: plantation moved late in august-september and was released from mid-september to november. When the autumn onions move, the temperature is high and some rice straw can be spread between the lines to cool and keep them wet。
Winter: deplanted in october-november, harvested in january-february. Winter temperatures are low, onions are slow to grow, and “falls” are used in production to supply the new year's and spring festival markets。
Iii. Varieties selection:
The selection of white flowers or purple flowers, fragrances and fragrances。
The main varieties are four-dimension onions, sichuan onions or locally grown onions. The acreage is 1. 2-1. 5 kg. The suitable planting period is march-may and september-october. It is immersed for 20 minutes with 55°c warm water, washed with water, dryed and sowed. High-season, well-oiled plots of land are selected, high-slender beds of 1. 2 metres wide are made, and decomposed organic fertilizers are applied as base fertilizers. The seedbeds were filled with bottom water before planting, with seeds of 4-5 grams per square metre of seed bed, then covered with 0. 5 centimetres of fine soil, and water was poured after repression. At the same time, sunnets are covered or straw is protected by wetting. The soil is humid until leaves are produced。
Iv. Employment:
Before planting, seedlings are screened and the strains of disease, disability and weakness are removed. Scratch and cut to the front and leave 2-3 centimetres to stimulate new root development. Plantation of 3 to 4 plants per den by 20 cm line and 10 cm range. Onions and onions can be properly rared, lightly planted, about 3 centimetres - 5 centimetres, and water can be sown in time。
V. Fertilization in general:
The shifting fields choose flat, loose, fertile, draining and easy-watered fields, preferably with soybeans, maize and other vegetables, not with onions and garlic. High-quality organic fertilizers of 2,000 kg per acre, three-dollar compound fattening of 50-70 kg, finely finely fined, with 1. 5 metres wide, and coverable membrane to increase the temperature of the ground during the winter, so that the harvest can be increased。
Vi. Field management:
The onion roots are thinly distributed, with weak absorptive capacity, intolerant of strong fats and insatiable of drought and floods, and must be watered in a small manner, with attention to the timely elimination of water accumulation after rain. After planting the seedlings, 5 kg of urea, or 15 kg of ammonium carbonate, were ploughed together in a timely manner, usually 1 in 10-14 days and not 15 days before the harvest. It also uses leaf-leaf fat to promote green onion。
Vii. Pest and pest control:
Pest control is dominated by maggots, leaf flies and tremors, and diseases are dominated by diseases such as disease, frost and grey disease. Pest and pest management needs to be based on the principles of prevention and integrated management, the application of agricultural and biological control measures, the scientific use of chemical pesticides, the coordination of control techniques and the realization of integrated benefits. In addition, organic fertilisation is increased and timely water is used to catch up. Extra phosphorous potassium fattening, less nitrogen fattening, better mouths。
