How to use herbicide when growing leek?

How to use herbicide when growing leek? Please guide the following herbicide techniques for your reference: first, 48% desloramine before seedling, 3 to 3.75 litres per hectare of seedling field after sowing before seedling fertilization. 50% promethazine WP 1.5g per hectare, application before seedling of seedling leek after sowing, 50% prometryne WP 1.5g to 2.25g per hectare, old leek wound healed and new leaves grew after cutting. 33.2% methamyl (Shitianbu) 1.5 to 2.25 litres per hectare, applied before seedling after sowing in the seedling field. 50% isoproturon WP 1.2 to 2.25 grams per hectare or 75 percent isoproturon WP 800 grams per hectare. 2. 15% Pyrrolofen EC 75 to 1000 milliliters per hectare after seedlings, and 3 to 5 leaves of Gramineae weeds after leek seedlings. 10.8% fluoropyrin EC 450 to 525 ml per hectare, and 3 to 5 leaves of Gramineae weeds after leek seedlings. 6.9 percent? Zhaocaoling (Weiba) suspension is 750 to 1000 milliliters per hectare, and 3 to 5 leaves of Gramineae weeds are applied after leek seedlings. 5% Jing Wo Ling (refined grass gram) milk is 750 to 1000 milliliters per hectare, and 3 to 5 leaves of Gramineae weeds are applied after leek seedlings. 1.5 to 2 liters per hectare of 2.5% chlorpromazine, and 3 to 5 leaf stage application of Gramineae weeds after leek seedlings. Click to get more leek planting technology click to get mass herbicide use technology click to get mass pesticide application technology