Wright, A.L. and Hons, F.M. (2005) Carbon and nitrogen sequestration and soil aggregation under sorghum cropping sequences. Biology and Fertility of Soils , 41 (2). pp. 95-100.
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Abstract
Management practices, such as no tillage (NT) and intensive cropping, have potential to increase C and N sequestration in agricultural soils. The objectives of this study were to investigate the impacts of conventional tillage (CT), NT, and cropping intensity on soil organic C (SOC) and N (SON) sequestration and on distribution within aggregate-size fractions in a central Texas soil after 20 years of treatment imposition. Tillage regime and cropping sequence significantly impacted both SOC and SON sequestration. At 0-5 cm, NT increased SOC storage compared to CT by 33% and 97% and SON storage by 25% and 117% for a sorghum/wheat/soybean (SWS) rotation and a continuous sorghum monoculture, respectively. Total SOC and SON storage at both 0-5 and 5-15 cm was greater for SWS than continuous sorghum regardless of tillage regime. The majority of SOC and SON storage at 0-5 cm was observed in 250-µm to 2-mm aggregates, and at 5-15 cm, in the >2-mm and 250-µm to 2-mm fractions. Averaged across cropping sequences at 0-5 cm, NT increased SOC storage compared to CT by 212%, 96%, 0%, and 31%, and SON storage by 122%, 92%, 0%, and 37% in >2-mm, 250-µm to 2-mm, 53- to 250-µm, and <53-µm aggregate-size fractions. No tillage and increased cropping intensity improved soil fertility by increasing soil organic matter levels and potential nutrient supply to crops.
| Item Type: | Article |
|---|---|
| Author Affiliation: | Department of Soil and Crop Sciences, Texas A&M University, 2474 TAMU, College Station, TX 77843-2474, USA |
| Subjects: | Plant Protection > Pesticides Soil Science and Microbiology > Soil Sciences |
| Divisions: | Sorghum |
| Depositing User: | Mr B Krishnamurthy |
| Date Deposited: | 02 Dec 2010 21:56 |
| Last Modified: | 29 Dec 2010 20:05 |
| Official URL: | http://dx.doi.org/10.1007/s00374-004-0819-2 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/869 |
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