How to choose herbicides for spice crops

The planting area of onion and onion as spice crops is expanding. In the production of onions and onions, improper selection of herbicides often results in reduced yield or no harvest, and will leave residual poison to the following crops. In the pollution-free production of onions and onions, the skillful use of herbicides is very important. When raising onion seedlings, use 50% promethazine wettable powder 65-75 grams per mu to spray 40-60 kilograms of water. Onion seedlings can be raised with 33% dimethamyl (herbicide) EC 100 ml per mu, or 48% Zhong Ding Ling (Diletamine) EC 150 ml per mu. Onions can be sprayed with 66-72 ml of 24% ethoxyfluoxane per mu and 50-60 kg of water before transplanting after soil preparation. Onions can be used with 48% trifluralin EC 100-150 ml per mu or 48% trimethalin EC 200 ml per mu before transplanting after soil preparation, spraying 50-60 kg of water. Onion planting after 3-4 leaf stage, per mu can use 24% fruit 66-72 ml, 50-60 kg of water spray. After onion transplanting, 33% herbicide EC can be used per mu 100-150 ml. Or use 100 grams of 50% riguron wettable powder per mu and spray 50-60 kg of water. In order to improve the effect of applying herbicides to onions and onions, attention should be paid to the application of herbicides before emergence after sowing. After transplanting, the weeds should be applied before the emergence of seedlings. Onion forbids the fruit in the 2-leaf stage, and use the fruit carefully before 3 leaves. It is applied around noon in sunny days when the temperature is low, and in the morning or afternoon when the temperature is high. Prometryne should not be used in sandy soil.