(1) Scientific water About 20 days after the onset of onion, the seedlings enter the seedlings. Since the air temperature during planting is relatively low, it cannot be watered in large quantities. Excessive watering will reduce the temperature of the seedlings and slow seedlings. At the same time, the new roots of the newly planted seedlings have not yet germinated, and they cannot be deficient in water. Therefore, this stage has more watering times for onions, and the number of watering each time is less. Generally, the principle is to keep the seedlings from wilting and to keep the ground dry so as to promote rapid rooting and seedling survival. After the onion seedlings grow into the winter, they enter the wintering period. To ensure that the planting onion seedlings safely pass through the winter, they must be poured over the winter water in due course. After the winter, it returns to green and enters the growth period of stems and leaves. The water requirement at this stage needs to be watered to promote growth, and watering must be controlled to prevent leggy growth. The method of controlling watering is called "seedlings". The seedlings are to be grasped according to the weather conditions, the nature of the soil, and the growth conditions after planting. Under normal conditions, the seedlings are grown for about 15 days. When the green leaves of the onion seedlings are dark green, the waxiness is increased, the thickness of the leaves is thickened, and the color of the heart leaves becomes dark, the watering of the seedlings is ended. In the future, the water is poured once every 8 to 9 days to make the soil dry and wet, so as to promote plant growth and prevent plant growth. Watering should be stopped 7-8 days before harvest to facilitate harvesting and avoid high water content in the bulbs and not storage. (2) Fertilization 7 days after transplanting, a rare human livestock waste water was applied, and then 7 high quality soil miscellaneous fertilizers were applied at intervals of 7 to 8 days to promote hair rooting and enhance cold resistance. During the cold season, onion seedlings grow slowly and can be topdressed. In late February of the following year, when bulbs enter the expansion stage, fertilizers should be reapplied 1 to 2 times. Mushi urea 10 to 12 kg plus potassium sulfate 5 to 6 kg. At the end of March, the bulbs expanded rapidly, and 1250 kilograms of human fecal urine was reconstructed per acre. Fertilization was stopped 25 days before harvest. (3) Loess tillage Loose soil is beneficial to the development of onion root system and bulb enlargement. It usually takes 3 to 4 seedlings, and the stem and leaf growth period is 2 to 3 times. After the plant is ridged, it should stop cultivating. The depth of cultivating is appropriate to about 3 cm, and the depth of the plant should be shallow. (4) timely harvest Onion harvesting is generally from the end of May to the beginning of June. When onion leaves gradually start to yellow from bottom to top, the pseudo-stem becomes soft and begins to fall, the bulb stops expanding, the outer leather material enters the dormancy phase, and marks that the bulb has matured and should be timely harvested. After the onion is harvested, it should be dried in the field for 2 to 3 days. Directly listed can be cut off the roots and cut off at the pseudo stems in the upper part of the bulb and can be sold in baskets. If you need to store onions, do not go stems and leaves, when the leaves are drying to 78% dry, the stems and leaves can be braided, hanging in a ventilated, cool, dry place, called hanging onions. nitrile gloves exam,nitrile exam gloves,nitrile gloves examination,disposable nitrile gloves HOLIK ASIA GROUP CO.LTD , https://www.holikasia.com