Triazine herbicides are more likely to carry over on low pH soils than high pH soils?

• A. True
• B. False

Answer: (B)

Triazine herbicides are generally more stable and can persist in the soil longer under certain conditions, and one of those conditions is soil pH. In low pH (acidic) soils, triazine herbicides are more likely to undergo chemical degradation, which leads to a reduced risk of carryover into subsequent growing seasons. The breakdown in low pH conditions is often due to increased microbial activity and the chemical properties of the herbicide that make it more prone to degradation.

On the other hand, higher pH soils tend to stabilize triazine herbicides, leading to increased potential for carryover. In these alkaline conditions, the herbicides can bind more tightly to soil particles and remain biologically active for extended periods. This phenomenon creates a risk for the crops planted in the following season.

Thus, the assertion that triazine herbicides are more likely to carry over on low pH soils is not accurate; they are actually more likely to carry over on high pH soils due to their stability in those conditions.