Which statement is true regarding preplant incorporated herbicide applications?

• A. They provide early weed control
• B. They can be used in all tillage systems
• C. They cause more crop injury than post-emergence applications
• D. They are not affected by soil composition

Answer: (A)

The statement regarding preplant incorporated herbicide applications that is true is that they provide early weed control. This method of application is designed to target weeds before they emerge, as the herbicide is incorporated into the soil prior to planting. By doing so, it allows the herbicide to be activated as the soil is disturbed, providing a longer period of weed control before the crop itself emerges. Early weed control is crucial for crop success, as weeds can compete with crops for nutrients, water, and light during their early growth stages.

The other statements do not accurately capture the characteristics of preplant incorporated herbicide applications. While there are various tillage systems, not all are compatible with this application method, as certain systems may not facilitate proper incorporation of the herbicide into the soil. Additionally, concerns regarding crop injury are valid; often, preplant applications can lead to more crop injury than post-emergence applications, primarily due to the potential for herbicide residues affecting young seedlings. The effectiveness of these herbicides can also be influenced by soil composition, such as texture and organic matter content, which can impact herbicide retention and availability.