Very sparse literature exists on the effect of soil active herbicides on nutrient availability. As part of a larger rangeland rehabilitation project, on four sites in northern Nevada, we quantified the effect of the herbicides Landmark�, Perspective�, and Plateau� relative to controls on surface soil (0-10 cm) nutrient availability. Samples were collected multiple times over two years. The data set is complex and herbicide treatments interacted with site and time of sampling. Overall, relative to the controls, mineral N, soil-solution sulfate, and bicarbonate-extractable phosphorus quantities were often elevated on herbicide-treated plots. In addition, on some sites, herbicide treatments affected micronutrient availability. We believe these changes in nutrient availability are largely a function of vegetation loss (lack of nutrient uptake) due to the herbicides. We will continue to monitor plots for at least one more year.
Oral presentation and poster titles, abstracts, and authors from the Society for Range Management (SRM) Annual Meetings and Tradeshows, from 2013 forward.