1. Transplanted fields The alfalfa can be applied in the 1-7 leaf stage, with 13.5-26 grams of active ingredient in the mu, spraying, draining the water before the medicine, and draining the water back to the field after the medicine to maintain the 3-5cm water layer.

2. Field seedlings The seedlings are applied after the 2.5 leaf stage with the same amount as above.