What is a characteristic of herbicides that are preplant incorporated?

• A. Immediate weed kill
• B. Long-lasting soil residual
• C. Early weed control
• D. Selective to certain crops

Answer: (C)

Herbicides that are preplant incorporated are applied to the soil before planting and then mixed into the soil. One of the primary characteristics of these herbicides is that they provide early weed control. This method helps to establish a weed-free environment from the outset, as the herbicide can begin to act on germinating weeds shortly after application.

By incorporating the herbicide into the soil, it can interact with weeds as they begin to emerge, allowing for effective control before the crops are planted or shortly after planting. This proactive approach is crucial in preventing competition from weeds, which can negatively impact crop establishment and yield.

The other options, while relevant to the use of herbicides, do not accurately describe preplant incorporated herbicides. Immediate weed kill typically describes post-emergent herbicides, while long-lasting soil residual is more a feature of certain persistent herbicides rather than a characteristic specifically tied to the preplant incorporated method. Selectivity to certain crops might apply to various herbicides but does not define the preplant incorporated type specifically. Thus, the primary characteristic of early weed control aligns well with the purpose and timing of using preplant incorporated herbicides.