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Published online 2 February 2006
Published in Soil Sci Soc Am J 70:382-392 (2006)
DOI: 10.2136/sssaj2005.0112
© 2006 Soil Science Society of America
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Soil Organic Nitrogen Enrichment Following Soybean in an Iowa Corn–Soybean Rotation

Dean A. Martensa, Dan B. Jaynesb,*, Thomas S. Colvinb, Thomas C. Kasparb and Douglas L. Karlenb

a D. Martens (deceased), USDA-ARS, Southwest Watershed Research Ctr., 2000 E. Allen Rd., Tucson, AZ 85719
b USDA-ARS, Natl. Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011


Figure 1
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  		Fig. 1. For each amino acid and amino sugar detected, the average (n = 50) percentage ± standard deviation of (A) the total amino acid and amino sugar concentration and (B) the total amino acid and amino sugar-N concentration.

 

Figure 2
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  		Fig. 2. Relationships between (A) May 1997 soil organic C content and fall corn yields and (B) May 1997 total N content and fall corn yields.

 

Figure 3
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  		Fig. 3. Relationship of selected amino acid-N concentrations measured in May 1997 (circle) and May 1999 (square) and corn yields for the respective year. The regression equations are for the 1997 values and do not include the 1999 values.

 

Figure 4
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  		Fig. 4. Relationship of individual and total amino sugar-N and ornithine-N concentrations measured in May 1997 (circle) and May 1999 (square) and corn yields for the respective year. The regression equation are for the 1997 values and do not include the 1999 values.

 




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