Improve herbicide effect: Select the appropriate herbicide. Because each has a certain herbicide spectrum herbicide, Zhejiang MCPA sodium salt, have destroyed nature, the Luoyang MCPA sodium salt, selective. Therefore, according to the main varieties of crop species and weeds, use of effective herbicides. Also select herbicides based on farming. Herbicides prevent: first herbicide injury and environmental conditions are closely related. Typically, soil texture, MCPA sodium salt, organic matter content is relatively constant, and humidity, light, precipitation, soil moisture is changed greatly from year to year, so the impact of environmental factors on the injury more complicated. Most herbicides conditions at higher temperatures better efficacy, crop is safe.