Fig. 4. Mean gravimetric moisture content, respiration, and CO2 efflux of the rototilled, disked, and control soils in the ancillary experiment. (a) Gravimetric moisture, (b) respiration, and (c) CO2 efflux. The soils were irrigated at 0 h. The error bars are the standard error of the mean (n = 3). Different letters indicate significant differences (P < 0.05) using t tests between treatments at each time. No t tests were done for the moisture data since only one replicate per treatment combination was analyzed.
