The current management of green onions

In the Anqiu region, the planting area of ​​open green onions in the past two years is increasing, and it is no longer an advantage to simply win by the amount. This year's vegetable farmers began to strictly control the cultivation of scallions from the onion to guarantee the output. Improve the onion's own quality. At present, the open-air onion grows to about 20-30 centimeters within the seedling aphid. Then, what aspects of management need attention?

The first is fertilizer management. At present, the onion seedlings are about 20-30 cm in height. It is a period of vigorous growth of onion seedlings and it is necessary to do a good job in fertilizer and water management. Can be staged to speed up fertilizer, such as urea, compound fertilizer, etc. 2-3 times, 15-20 kg per acre. At the same time can be combined with foliar spraying potassium dihydrogen phosphate or chitin, alginic acid, such as foliar fertilizer, to promote robust growth of plants, one to enhance disease resistance, and secondly, can be strong resistance to lodging.

Followed by pest and disease management. In general, diseases that cause damage to open green onions include downy mildew, purple spot, and rust. For downy mildew, it can be sprayed with 70% 800mg of Alphaaluminum Manganese Zinc 800x or 25% Metalaxylpropamocarb 1000 times; Purple Spot can be sprayed with 75% chlorothalonil plus 70% Thiophanate 1000 times Control; onion rust can be used 30% triadimefon plus a small amount of washing powder spray control. The pests that injure open-air onions are mainly leafminers, onion flies, cotton bollworms, and so on. For spotted flies, they can be treated with 5% Suppressor 2000 times solution or 40% chlorpyrifos with 2500 times solution, and Onion flies can use 1.8% of Ave. Bactin 1000 times solution or 50% phoxim 1000 times solution with water to root; for cotton bollworm and other large pests, can be used 4.5% high efficiency cypermethrin 2000 times or 2% A peacekeeping salt 1500 times spray control. For adult insects of these pests, sweet and sour liquid (sugar: vinegar: water is prepared according to 1:1:2.5) can be used, and appropriate amount of 90% trichlorfon is used for trapping. It is worth noting that about 15 days before the harvest of onions in the open air, all medications should be stopped to ensure safety.

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