How does leaf shape affect the efficacy of herbicides?

Broad leaves are particularly effective at minimizing herbicide runoff due to their larger surface area, which allows for a more effective retention of the liquid applied. This means when a herbicide is sprayed on broad-leaved plants, there is a greater chance that a significant amount will adhere to the leaf surface and be absorbed into the plant tissues. The structure of broad leaves can also trap more droplets of herbicide, decreasing the likelihood that those droplets will roll off or evaporate quickly. This characteristic ultimately enhances the efficacy of the herbicide by ensuring that more of it is available for uptake by the plant.

In contrast, narrow leaves may not provide the same level of retention, and their structure could lead to more herbicide runoff, thereby reducing effectiveness.