Fig. 1. Linear response plateau plots of turfgrass color and yield measurements to NO₃–N desorbed from AEMs across two growing seasons. Data are shown for AEMs used in situ at a depth of 0 to 7.6 cm. Vertical lines to the x-axes in the plots indicate the critical level of AEM-desorbed NO₃–N, above which there is no change in turfgrass color to increasing AEM-desorbed NO₃–N. No linear plateau model is shown for dry matter yield because the model is not applicable.