4-part graph showing growing season date (x) vs. TAN (y) for 5 fertility treatments in bare ground vs. plastic. 150 lb N/ac starts higher than other treatments and decreases.

Figure 1. The influence of bedding × fertility treatments × time interaction on soil total available nitrogen (TAN) at Clinton (p < 0.0001; A, B) and Kinston (p < 0.0001; C, D), 2021. TAN was calculated as the sum of soil nitrate and ammonium nitrogen. Means followed by the same letter are not significantly different (p > 0.05).