Fig. 3 Total soil respiration as a function of soil temperature at 10 cm in (a) control, (b) no-till, and (c) moldboard-plowed plots. Open squares indicate the measurements made during the 2 wk following rototillage of the control plots on Day 167. Open triangles indicate measurements made during the period when soil water content was below 0.15 m³ m^-3 (Day 200–225)