How can the timing of rain affect herbicide application?

The timing of rain is crucial in herbicide application due to its potential to dilute or wash away the chemicals before they have had a chance to adhere to the target weeds and be absorbed effectively. When rain occurs shortly after herbicide application, it can impact the herbicide's concentration in the soil and on the plant surfaces, leading to reduced efficacy. Specifically, if rain falls before the herbicide has been absorbed by the plant, it might wash the product off the leaf surfaces or dilute the concentration in the soil, which can hinder the control of the weeds.

Understanding the weather forecast and planning herbicide applications accordingly can significantly influence the outcome of weed management strategies. Thus, the effect of rainfall timing is an essential consideration in formulating effective herbicide application plans.