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Published online 2 February 2006
Published in Soil Sci Soc Am J 70:426-433 (2006)
DOI: 10.2136/sssaj2005.0100
© 2006 Soil Science Society of America
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Soil Organic Carbon Changes in Diversified Rotations of the Western Corn Belt

G. E. Varvel*

USDA-ARS and Dep. of Agronomy and Horticulture, Univ. of Nebraska, Lincoln, NE 68583


Figure 1
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  		Fig. 1. Total SOC in the surface 30-cm depth at Mead, NE as affected by cropping system and N fertilizer level at several points in time during the first 18 yr of the study. Monoculture systems (CC = continuous corn, CSB = continuous soybean, and CSG = continuous grain sorghum) are plotted on the left. On the right side are plotted 2-yr C/SB = corn-soybean, SG/SB = grain sorghum-soybean above the 4-yr cropping systems, OCL/SG/SB/C = oat+clover-grain sorghum-soybean-corn, and SB/SG/OCL/C = soybean-grain sorghum-oat+clover-corn.

 




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