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Long-Term Corn Residue Effects

Harvest Alternatives, Soil Carbon Turnover, and Root-Derived Carbon

^a USDA-ARS, North Central Soil Conservation Research Lab, 803 Iowa Ave., Morris, MN 56267
^b USDA-ARS, Soil and Water Management Research, St. Paul, MN 55108
^c USDA-ARS, Soil and Water Management Research, St. Paul, MN 55108

View larger version (17K): [in a new window]   Fig. 1. Efficiency of moldboard tillage for incorporation of total source carbon into corn-derived soil organic carbon (cdSOC). The stover-returned treatment represents corn stover return after grain removal, and the stover-harvested treatment represents corn stover harvest as silage.

View larger version (26K): [in a new window]   Fig. 2. Harvest indices from (A) high fertility, (B) low fertility, and (C) unfertilized check plots with stover returned for 30 yr of continuous corn except for crop failure in year 28. (n = 4 from high and low fertility treatments and n = 1 from unfertilized check.)

View larger version (25K): [in a new window]   Fig. 3. (A) Cumulative growing degree units and (B) cumulative precipitation from the time of planting until grain was harvested.