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Occasional Tillage of No-Till Systems

Carbon Dioxide Flux and Changes in Total and Labile Soil Organic Carbon

^a INIA La Estanzuela, CC 39173 Colonia, Uruguay
^b 279 Plant Science, Univ. of Nebraska, Lincoln, NE 68583-0915
^c Dep. of Biosystems Engineering, Univ. of Nebraska, Lincoln, NE 68583-0726

View larger version (15K): [in this window] [in a new window]   Fig. 1. Stocks of soil organic carbon (SOC) on an equivalent soil mass of 60 kg m–2, representing approximately the 0- to 5-cm depth, at 24 to 32 mo after one-time tillage of no-till land at Rogers Memorial Farm [RMF; LSD(0.05) = 194] and Agricultural Research and Development Center [ARDC; LSD(0.05) = 330] in eastern Nebraska.

View larger version (17K): [in this window] [in a new window]   Fig. 2. Stocks of soil organic carbon (SOC) on an equivalent soil mass of 400 kg m–2, representing approximately the 0- to 30-cm soil depth, at 24 to 32 mo after one-time tillage of no-till land at Rogers Memorial Farm [RMF; LSD(0.05) = 413] and Agricultural Research and Development Center [ARDC; LSD(0.05) = 967] in eastern Nebraska. The tillage effects were not significant.