Carbon and Nitrogen Storage are Greater under Biennial Tillage in a Minnesota Corn–Soybean Rotation
- 1 September 2006
- journal article
- Published by Wiley in Soil Science Society of America Journal
- Vol. 70 (5), 1752-1762
- https://doi.org/10.2136/sssaj2006.0010
Abstract
Few studies have examined the impacts of rotational tillage regimes on soil carbon (C) and nitrogen (N). We measured the C and N content of soils managed under corn (Zea mays L.)–soybean (Glycine max L.) rotation following 10 and 15 yr of treatments. A conventional tillage (CT) regime employing moldboard and chisel plowing in alternate years was compared with both continuous no‐till (NT) and biennial tillage (BT), which employed chisel plowing before soybean only. While masses of C and N in the upper 0.3 m under both BT and NT were higher than CT, only the BT treatment differed from CT when the entire sampled depth (0.6 m) was considered. Decreased C inputs, as indicated by reduced grain yields, may have limited C storage in the NT system. Thus, while more C was apparently retained under NT per unit of C input, some tillage appears necessary in this climate and cropping system to maximize C storage. Soil carbon dioxide (CO2) fluxes under NT were greater than CT during a drier than normal year, suggesting that C storage may also be partly constrained under NT due to wetter conditions that promote increased soil respiration. Increased temperature sensitivity of soil respiration with increasing soil moisture was also observed. These findings indicate that long‐term biennial chisel plowing for corn–soybean in the upper mid‐west USA can enhance C storage, reduce tillage‐related fuel costs, and maintain yields compared with more intensive annual tillage.This publication has 43 references indexed in Scilit:
- On the variability of respiration in terrestrial ecosystems: moving beyond Q10Global Change Biology, 2005
- Soil organic carbon and nitrogen in a Minnesota soil as related to tillage, residue and nitrogen managementSoil and Tillage Research, 2005
- Long-term tillage effects on cool-season soybean in rotation with barley, soil properties and carbon and nitrogen storage for fine sandy loams in the humid climate of Atlantic CanadaSoil and Tillage Research, 2005
- Tillage and Crop Residue Effects on Soil Carbon and Carbon Dioxide Emission in Corn–Soybean RotationsJournal of Environmental Quality, 2005
- Carbon sequestration in a long-term conventional versus conservation tillage experimentSoil and Tillage Research, 2003
- Soil and rhizosphere microorganisms have the same Q 10 for respiration in a model systemGlobal Change Biology, 2003
- Roots exert a strong influence on the temperature sensitivityof soil respirationNature, 1998
- Impact of tillage practices on organic carbon and nitrogen storage in cool, humid soils of eastern CanadaSoil and Tillage Research, 1997
- Tillage Effects on Some Soil Physical and Corn Physiological CharacteristicsAgronomy Journal, 1990
- Early Growth of Corn as Affected by Soil TemperatureSoil Science Society of America Journal, 1964