Weed, Herbicide, and Green Manure Management Aspects Influencing Rotations in Idaho Potato Cropping Systems
The most restrictive plant-back recommendations have been stated on the labels of recently developed potato cropping systems herbicides since data specific to conditions in irrigated crops grown in the semi-arid West are not available. If these plant-back intervals are incorrect and remain too restrictive, Idaho growers will not be able to use these new products at all and suffer losses from ineffective weed control or they will use them to control weeds which are becoming problematic in their fields, such as hairy nightshade, and not be able to rotate to desirable crops for maximum economic returns and sustainability. Growers have expressed interest in utilizing alternative weed control methods, such as green manure crops, to allow flexibility in crop rotation. However, little research has been conducted to determine green manure crop inputs,
including weed control, and weed control in a potato-sugar beet-wheat rotation after green manure incorporation. The purpose of this study is to determine how weeds, herbicides, and green manure management aspects influence rotations in Idaho potato cropping systems by evaluating persistence in soil of a new wheat and a new potato herbicide and evaluating inputs for green manure crops, subsequent weed control benefits in a potato rotation, and safety of potato cropping system herbicides to green manure crops.