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Article
Tillage, Crop Rotation, and Cultural Practice Effects on Dryland Soil Carbon Fractions
Open Journal of Soil Science
  • Upendra M. Sainju, United States Department of Agriculture
  • Andrew W. Lenssen, Iowa State University
  • TheCan Caesar-TonThat, United States Department of Agriculture
  • Jalai D. Jabro, United States Department of Agriculture
  • Robert T. Lartey, United States Department of Agriculture
  • Robert G. Evans, United States Department of Agriculture
  • Brett L. Allen, United States Department of Agriculture
Document Type
Article
Publication Date
9-1-2012
DOI
10.4236/ojss.2012.23029
Abstract

Information is needed on novel management practices to increase dryland C sequestration and soil quality in the northern Great Plains, USA. We evaluated the effects of tillage, crop rotation, and cultural practice on dryland crop biomass (stems and leaves) yield, surface residue, and soil C fractions at the 0-20 cm depth from 2004 to 2008 in a Williams loam in eastern Montana, USA. Treatments were two tillage (no-tillage [NT] and conventional tillage [CT]), two crop rotations (continuous spring wheat [Triticum aestivum L.] [CW] and spring wheat-barley [Hordeum vulgaris L.] hay-corn [Zea mays L.]-pea [Pisum sativum L.] [W-B-C-P]), and two cultural practices (regular [conventional seed rates and plant spacing, conventional planting date, broadcast N fertilization, and reduced stubble height] and ecological [variable seed rates and plant spacing, delayed planting, banded N fertilization, and increased stubble height]). Carbon fractions were soil organic C (SOC), particulate organic C (POC), microbial biomass C (MBC), and potential C mineralization (PCM). Crop biomass was 24% to 39% greater in W-B-C-P than in CW in 2004 and 2005. Surface residue C was 36% greater in NT than in CT in the regular practice. At 5 - 20 cm, SOC was 14% greater in NT with W-B-C-P and the regular practice than in CT with CW and the ecological practice. In 2007, POC and PCM at 0 - 20 cm were 23 to 54% greater in NT with CW or the regular practice than in CT with CW or the ecological practice. Similarly, MBC at 10 - 20 cm was 70% greater with the regular than with the ecological practice in NT with CW. Surface residue, PCM, and MBC declined from autumn 2007 to spring 2008. No-tillage with the regular cultural practice increased surface residue and soil C storage and microbial biomass and activity compared to conventional tillage with the ecological practice. Mineralization reduced surface residue and soil labile C fractions from autumn to spring.

Comments

This article is from Open Journal of Soil Science 2 (2012): 242–255, doi:10.4236/ojss.2012.23029.

Rights
This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.
Language
en
Date Available
2014-07-21
File Format
application/pdf
Citation Information
Upendra M. Sainju, Andrew W. Lenssen, TheCan Caesar-TonThat, Jalai D. Jabro, et al.. "Tillage, Crop Rotation, and Cultural Practice Effects on Dryland Soil Carbon Fractions" Open Journal of Soil Science Vol. 2 Iss. 3 (2012) p. 242 - 255
Available at: http://works.bepress.com/andrew_lenssen/41/