Pollution-free green onion efficient cultivation and processing technology (2)

3. Site preparation and colonization: Onion field is planted in the middle and late May to early June. The planting is too late, the light blue formation period is short, the yield is low, and the quality is poor. Planting seedlings to plant height 35cm-4Ocm, stem diameter 1cm-15cm for the appropriate period. Daejeon’s choice: Did not plant onions, garlic, leeks, onions, and other lily plants within three years. The texture is loose, and it can be poured and drained as early as possible. It has good soil permeability, and has good fertilizer and water holding capacity. Ph value is 7.0-75. The land is colonized. Soil preparation and fertilization: Welsh onions are suitable for crop rotation, and wheat and potatoes can be used as weeds. After the harvest, the soil was ploughed in time and planted. In order to facilitate softening of the soil, green onions were initially planted in the ditch, and the furrows were gradually filled with furrows and cultivated into high ridges. The general groove distance is 70cm-80cm, the groove width is 15cm-20cm, and the groove depth is about 20cm. The bottom of the ditch is applied with decomposed organic fertilizer. Generally, more than 500kg organic fertilizer is applied per 667m2, 3kg nitrogen fertilizer (6.6kg ammonium hydrogencarbonate), P2O5-6kg (superphosphate 60kg), and K2O-6kg (potassium sulfate 12kg). Or, the compound fertilizer converted in accordance with this ratio is applied to Daejeon. Deeply turning the land to fully mix the soil fertilizer and preparing for planting. Planting methods: Before the planting, the onion seedlings were dug up and shaken off the soil, and they were planted according to the size of the seedlings. Big seedlings should be thin, seedlings slightly dense. Wide ridges are generally used for single-row dense planting, which is conducive to soil softening and increasing light blue length. General spacing 80cm, spacing 50cm-6cm, planting 17,000-20000 plants per 667m2, using 250kg onion seedlings. The colonization method uses the pendulum method, which is to rely on the side of the ditch, such as east and west ditch, placed on the south side of the ditch, and the south and north ditch is best placed on the west side, which can reduce the sun exposure and is conducive to slow seedlings. . After placing neatly, the root covering soil shall not exceed the heart of scallion. After planting, it shall be stepped on and immediately watered. IV. Field Management 1. After cultivating weeds and welsh onions, enter the rainy season, we should strengthen the field cultivation and weed control, loosen the topsoil, and store water to ensure the development of the root system. 33% Shi Tianbu (weeding pass) 100kg-150kg water 60kg-75kg can evenly spray the ground weeding. 2. Soil softening is an important measure to soften the leaf sheath and increase the length of light blue. Generally, after easing seedlings, a small amount of soil is covered by cultivating and weeding: before the rainy season comes, the planting ditch is filled in; after the cool, the earth is cultivated, and the soil is cultivated once every other month. Soil should be dried in the morning after dew, when the soil is cool, such as soil temperature is too high humidity, easy to cause rotten stems. In the first and second soils, the temperature is high, the plants grow slowly, and the soil should be shallow. In the third and fourth soils, the plants grow rapidly and the soil should be thicker. Each height of earth is suitable for the junction of the leaf body and the leaf sheath. Do not bury the heart and leaves so as not to affect the growth of green onions. Multiple earthing can significantly improve the wind resistance of the plants. 3. After top dressing and watering, after entering the summer season, the physiological function of the shoots and roots weakened, and most of the original fibrous roots rotted. After 4-5 days, the new roots were renewed. The slow seedlings were slow and were in a semi-dormant state. Onion is more resistant to high temperature and drought than water immersed. The management center is to promote roots, that is, to maintain good air permeability and promote root growth. Days are not suitable for watering due to drought, and attention should be paid to preventing the occurrence of rot, yellow leaves and dead seedlings due to high temperature and high humidity, poor soil permeability, etc.; pay attention to drainage in case of heavy rain to prevent onions and gutters from accumulating water; , In late July, late August and early mid-September, each fertilizer will be top-dressed, and the effective nitrogen fertilizer - ammonium sulfate 15kg-20kg will be applied. The principle of pouring, pouring, and pouring shall be mastered in irrigation; especially in late September, the climate will be cool. The temperature difference between day and night increases, and the daily average temperature drops below 25°C. Plants thrive and enter the light blue period. It is a critical period for fertilizer and water management. In the aspect of water management, when the temperature is still high, the watering should be lightly poured, and the water should be poured sooner or later. Afterwards, as the growth of the plants increases, the number of waterings is gradually increased to keep the ground moist. Combined with paddy soil watering to top dressing, topdressing urea 5kg/667m2, to meet the needs of light green growth; reduce the watering in early October, due to the cold weather before and after the frost gradually, plant growth is slow, until harvest, mainly by leaf nutrient enrichment Underground pseudo stems. Maintaining good soil moisture during this period is conducive to nutrient operation. Stop watering 7-8 days before harvest to improve storage resistance.

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