Fig. 5. Mean soil water NO₃–N concentrations (152-cm depth) throughout the growing season for (A, B) several N (kg N ha^–1) treatments and (C, D) two irrigation treatments. Means labeled with the same letter on a given date are not different as determined by LSD at = 0.10. Significant differences in NO₃–N from one sampling date to the next are indicated with a , N treatment by time interactions with a N, and irrigation treatment by time interactions with a I, as determined by repeated measures analysis at = 0.10.