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Published online 1 January 2007
Published in Soil Sci Soc Am J 71:133-139 (2007)
DOI: 10.2136/sssaj2006.0167
© 2007 Soil Science Society of America
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Oxygen Effects on Carbon, Polyphenols, and Nitrogen Mineralization Potential in Soil

L. M. Zibilske* and J. M. Bradford

USDA-ARS Integrated Farming and Natural Resour. Res. Unit, 2413 E. Hwy. 83, Weslaco, TX 78596-8344


Figure 1
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  		Fig. 1. Phenol oxidase activity in soil amended with (upper) cowpea or (lower) sorghum residues and incubated for 110 d at 0.5, 10, and 21% O2. Control values have been subtracted, n = 3. Bars are ±1 SEM.

 

Figure 2
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  		Fig. 2. Water-extractable organic C in soil amended with (upper) cowpea or (lower) sorghum residues and incubated for 110 d at 0.5, 10, and 21% O2. Control values have been subtracted, n = 3. Bars are ±1 SEM.

 

Figure 3
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  		Fig. 3. Arginine ammonification rates in soil amended with (upper) cowpea or (lower) sorghum residues and incubated for 110 d at 0.5, 10, and 21% O2. Control values have been subtracted, n = 3. Bars are ±1 SEM.

 

Figure 4
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  		Fig. 4. Peroxidase activity in soil amended with (upper) cowpea or (lower) sorghum residues and incubated for 110 d at 0.5, 10, and 21% O2. Control values have been subtracted, n = 3. Bars are ±1 SEM.

 

Figure 5
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  		Fig. 5. Water-extractable polyphenolics in soil amended with (upper) cowpea or (lower) sorghum residues and incubated for 110 d at 0.5, 10, and 21% O2. Control values have been subtracted, n = 3. Bars are ±1 SEM.

 




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