1. "One level": the ground should be level. Fine cultivation shall be carried out to ensure that the ground is flat and free of large soil blocks and potholes.

2. "two evenly": the drug should be mixed evenly on the carrier, spray or sprinkle the soil evenly.

3. "Three criteria": application time, application quantity and application area. For example, 40% of Avena is used to control wild oats, and 3 kg / HA is used before sowing.

4. "Four aspects": seedling, grass, weather and soil. It is not easy to apply medicine to the UN rooted or thin seedlings: according to the types and growth of weeds; when the temperature is low, the amount of medicine is at the upper limit of the medicine; when the soil is sticky and heavy, the amount of medicine is higher, but less in sandy soil; when the soil is dry, the medicine is not used.

5. "Five no": weak seedlings do not apply medicine; paddy field water is less than 3 cm shallow or the water depth is over the heart leaves do not apply medicine; the soil is too dry to apply medicine; heavy rain or when there is dew on the leaves do not apply medicine; paddy field leakage does not apply medicine.