Five major external factors affecting the efficacy of herbicides
1. Soil type: including soil composition, acidity and alkalinity. The higher the organic matter content in the soil, the more the drug is adsorbed. Therefore, the amount of the herbicide used in different soils is different. The acidity and alkalinity of the soil have an effect on the stability of the herbicide and the sensitivity of the plant to the agent.
2, soil moisture: it has a greater impact on the efficacy of the drug, such as simazine and other drugs in the relatively humid conditions, easy to play, if the soil is dry and use the cable effect.
3, temperature: temperature affects the penetration and conduction speed of the drug, which affects the efficacy of the drug. Generally, the herbicide is better at temperatures above 20 °C.
4, air humidity: air dry when used, weed pores closed, low efficacy, and vice versa.
5. Soil microorganisms: Long-term use of a single herbicide increases the number of microorganisms that decompose the agent in the soil, thereby shortening the residual period.
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