Herbicides that remain active in the soil for a large part of the growing season are called:

• A. Rapidly Degrading
• B. Nonpersistent
• C. Volatility
• D. Persistent

Answer: (D)

Herbicides that stay active in soil for a large part of the growing season are described as persistent. Persistence means the chemical resists breakdown by microbes, light, and water, so it remains effective in the soil for an extended period and continues to control weeds during much of the season. This long-lasting residue can be advantageous for ongoing weed management but also raises the risk of carryover to subsequent crops or harming sensitive plants, so labels and crop rotation plans need to be considered. The other terms don’t fit because rapidly degrading and nonpersistent describe herbicides that break down quickly, not ones that remain active for a long time, and volatility refers to a product turning into a gas, not staying in the soil.