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Published online 6 July 2006
Published in J Environ Qual 35:1507-1517 (2006)
DOI: 10.2134/jeq2005.0189
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Right arrow Cover Crops

Carbon Supply and Storage in Tilled and Nontilled Soils as Influenced by Cover Crops and Nitrogen Fertilization

Upendra M. Sainjua,*, Bharat P. Singhb, Wayne F. Whiteheadb and Shirley Wangb

a USDA-ARS-NPARL, 1500 North Central Avenue, Sidney, MT 59270
b Agricultural Research Station, Fort Valley State University, Fort Valley, GA 31030


Figure 1
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  		Fig. 1. (A) Mean monthly temperature and (B) total monthly rainfall from January to December in 2000, 2001, and 2002, and the 41-yr average near the experimental site.

 

Figure 2
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  		Fig. 2. Soil bulk density in tilled and nontilled systems at the 0- to 120-cm depth averaged across cover crops and N fertilization rates. CT, chisel-tilled system; NT, no-tilled system; ST, strip-tilled system. Bars followed by different letters within a depth are significantly different at P ≤ 0.05 by the least square means test.

 

Figure 3
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  		Fig. 3. Effects of cover crops on soil organic C in a no-tilled system from October 1999 to November 2000 at the (A) 0- to 10- and (B) 10- to 30-cm depths averaged across N fertilization rates. R, cereal rye; V, hairy vetch; VR, hairy vetch and rye biculture; WW, winter weeds. LSD (0.05) is the least significant difference between cover crops within a sampling date at P ≤ 0.05.

 

Figure 4
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  		Fig. 4. Effects of cover crops on soil organic C in a chisel-tilled system from October 1999 to November 2000 at the (A) 0- to 10-, (B) 10- to 30-, and (C) 30- to 60-cm depths averaged across N fertilization rates. R, cereal rye; V, hairy vetch; VR, hairy vetch and rye biculture; WW, winter weeds. LSD (0.05) is the least significant difference between cover crops within a sampling date at P ≤ 0.05.

 

Figure 5
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  		Fig. 5. Soil organic C in tilled and nontilled systems at the 0- to 120-cm depth averaged across cover crops and N fertilization rates. CT, chisel-tilled system; NT, no-tilled system; ST, strip-tilled system. Bars followed by different letters within a depth are significantly different at P ≤ 0.05 by the least square means test.

 




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