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Long-Term Tillage and Cropping Sequence Effects on Dryland Residue and Soil Carbon Fractions

USDA-ARS, Northern Plains Agricultural Research Lab., 1500 North Central Ave., Sidney, MT 59270

View larger version (18K): [in this window] [in a new window]   Fig. 1. Effects of tillage and cropping sequence on crop biomass (stems + leaves) residue returned to soil from 1984 to 2004 at the experimental site, 11 km north of Culbertson, MT. FSTCW represents fall- and spring-tilled continuous spring wheat; FSTW-B/P, fall- and spring-tilled spring wheat–barley (1984–1999) followed by spring wheat–pea (2000–2004); NTCW, no-till continuous spring wheat; STCW, spring-tilled continuous spring wheat; and STW-F, spring-tilled spring wheat–fallow. Bars above or below biomass yield in a year represent LSD at P = 0.05. For measuring the effect of total crop residue returned to the soil from 1984 to 2004 on soil C fractions, data for crop biomass or straw yield for treatments NTCW, FSTCW, and STW-F from 1984 to 1993 were taken from Aase and Pikul (1995).