Onion should be high-yield, in early March to pay attention to pouring back to Qingshui. After the plants return to green, they must be carefully managed. 1. When the onion flower buds are not open, they are removed to promote the development and growth of the child buds. 2. Some plants with a convulsions are accompanied by the emergence of a child bud. At this time, regardless of whether the calyx is open or not, all the buds of the child bud plants (ie buds) will be removed early to facilitate the seizure of high yield. 3. When removing flower buds, be sure to protect the flower buds. 4. Pay attention to the spraying of ferrous sulfate, ammonium molybdate, and copper sulfate 1000 times after the end of March. After about 8 days, spray 3 times, which can significantly increase production. 5. In early April, combine 15 kg of urea per acre with watering to keep the soil dry and wet. 6, using onion digging medium-sized ditch planting must be cultivated soil 1 or 2 times, can grow about 10 cm light blue. 7, prevention and treatment of pests. Purple spot: can be used 1.5% bacteria off 800 ~ 1000 times or bacteria Taike 1500 times alternating spray, 7 days spray 1, even spray 2 ~ 3 times. Diseases can be used to control the two fields. Green onion thrips: 1000 times can be used Channa grams, or bevac 1000 times spray. Onion Root: Can be used 500 times 1.1% matrine, or 90% trichlorfon 600 ~ 1000 times irrigation.
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