Claim · model-written summary
Across crop rotations, OC decay rates increased together with OC input rates in several systems.
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentSettingValueQualifier
Verbatim
e0“the corn-soybean agroecosystem [Zea mays L.-Glycine max (L.) Merr.]”
e5“When all phases of the crop rotations were evaluated over the long term, OC decay rates increased concomitantly with OC input rates in several systems”
Title
Nitrogen fertilizer effects on soil carbon balances in Midwestern U.S. agricultural systems
Ann E. Russell; Cynthia A. Cambardella; David A. Laird; et al. Ecological Applications 2009. doi:10.1890/07-1919.1
Other claims from this paper (7)
- Intervention effect N fertilization increased total organic-carbon inputs of corn at both sites (P < 0.05).
- Observation Belowground NPP made up only 6-22% of total corn NPP.
- Intervention effect N fertilization did not significantly influence belowground NPP of corn.
- Observation Soil C sequestration was virtually nil in 78% of the systems studied, despite up to 48 years of N additions.
- Mechanism Increases in decay rates with N fertilization apparently offset gains in carbon inputs, so soil C sequestration was virtually nil.
- Association Quantity of belowground OC inputs was the best predictor of long-term soil C storage.
- Recommendation Selecting crops with high belowground NPP is a more effective practice than increased N-fertilizer additions for increasing soil C sequestration.