First, watering: Onion generally does not water during the winter, and no pests and diseases. In March-April, it is necessary to pour water once and return to Qingshui; enter the vigorous growth period of the leaves and properly strengthen the irrigation; when the bulbs are expanded, about 10 days, the seedlings will be planted to inhibit the growth of the leaves; when there are 6 functional leaves, they will be poured once, and then Seedlings were planted for 10 days to prevent bulbs from inflating. After the seedlings, bulbs begin to expand, which is a critical period for topdressing and watering. However, due to the increase in temperature, evaporation, and plant growth during this period, it is the period when most water is needed. Watering should be carried out properly, and the field should be kept moist. Irrigation should be performed sooner or later. It was found that the bolting should be immediately removed from the whole flower bud and bulbs can be formed. Reduce the number of watering before maturity and stop watering 1 week before harvest.
Second, top dressing: onion into the leaf growth period, back to green before the enlarged stems, the amount of fertilizer required most, reapply 1-2 times fertilizer, Mushi urea 15 kg, potassium sulfate 5-7 kg; appropriate increase in phosphorus, Potash fertilizer is good for bulb development. When the bulb grows to 2 cm, Mu recovers about 15 kilograms of ternary compound fertilizer, appropriate amount of fertilizer is added during the expansion of the bulbs, and 15-20 kilograms of urea are harvested in mu. The two fertilization intervals are 10-15 days.
Third, timely prevention and control of pests and diseases: damage onion pests and diseases is mainly gray mold and spotted fly, pay attention to the right medicine.
Fourth, the harvest: onion bulbs hypertrophy, most of the plants lodging, the lower 1-2 pieces of yellow leaves, the first 3-4 pieces of the tip of the yellow part of the harvest. When the harvest should be selected in the sunny, after the harvest drying in place 3-5 days, drying only when the sun does not dry the head (can cover the rear row of leaves in the front row of bulbs); after drying, can promote the bulb after ripening, and Dry skin to facilitate storage.
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