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Published online 27 February 2006
Published in Soil Sci Soc Am J 70:668-678 (2006)
DOI: 10.2136/sssaj2005.0089
© 2006 Soil Science Society of America
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Tillage and Crop Rotation Effects on Dryland Soil and Residue Carbon and Nitrogen

Upendra M. Sainju*, Andrew Lenssen, Thecan Caesar-Tonthat and Jed Waddell

USDA-ARS, 1500 North Central Avenue, Sidney, MT 59270


Figure 1
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  		Fig. 1. (A) Soil particulate organic C (POC) content and (B) POC/soil organic C (SOC) ratio at the 0- to 5-cm depth, averaged across tillage, as influenced by crop rotation. Crop rotation is CW, continuous spring wheat (Triticum aestivum L.); W-F, spring wheat-fallow; W-L, spring wheat-lentil (Lens culinaris Medic.); W-P-F, spring wheat-pea (Pisum sativum L.)-fallow; and W-W-F, spring wheat-spring wheat-fallow. Bars followed by the same letter at the top are not significantly different at P ≤ 0.05 by the least square means test. Values for conservation reserve program (CRP) are shown for comparison only and not used in the statistical analysis of data.

 




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