How to use herbicides in leek fields?

How to use herbicide in leek field? When is the good time to use herbicide to grow leek? Do not ask experienced netizens to help introduce leek as a perennial root vegetable, which is highly adaptable, cold-resistant and heat-resistant. It is cultivated everywhere in China and can be produced year-round in many areas in the south, but weeding leek is a common headache for growers. Therefore, the farming network sorted out the methods of using herbicides in leek fields, which are listed in detail below for netizens' reference. First, use in front of leek seedlings: 1. Use 48% thalidomide, 3 to 3.75 liters per hectare, after sowing in the leek seedling field, that is, before the emergence of leek. 2. Use 50% prometryne WP 1.5g per hectare after sowing and before emergence of leek. 3. Use 50% prometrine WP 1.5g to 2.25g per hectare after the old leek is cut and new leaves grow. 4. Use 33.2% methamyl (Shitianbu) 1.5 to 2.25 liters per hectare, after the leek seedlings are sown, and before emergence, the leek is applied. 5. Use 50% isoproturon WP 1.2 to 2.25 grams per hectare or 75 percent isoproturon WP 800 grams per hectare after sowing and before emergence of leek. 2. Use after leek emergence: 1. Use 15% Pyrrolofen EC 750 to 1000 milliliters per hectare. After leek emergence, grass weeds grow 3 to 5 leaves. 2. Using 450 to 525 milliliters per hectare of 10.8% fine fluoropyrin EC can be applied to Gramineae weeds at 3 to 5 leaves after leek emergence. 3. The use of 6.9% oxazolyl suspension of 750 to 1000 ml per hectare can be used to control Gramineae weeds after leek emergence, and when the weeds grow 3 to 5 leaves. 4. The use of 5% Jing Wo Ling (refined grass gram) milk of 750 to 1000 ml per hectare can be used to control Gramineae weeds after leek emergence and apply when the weeds grow 3 to 5 leaves. 5. 1.5 to 2 liters per hectare of 2.5% promethazine can be used to control leek emergence, and Gramineae weeds can be applied at 3-5 leaf stage. Video techniques for planting leek fertilization methods for planting leek