Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 17 August 2005
Published in Agron J 97:1279-1290 (2005)
DOI: 10.2134/agronj2004.0213
© 2005 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Tillage, Cover Crops, and Nitrogen Fertilization Effects on Cotton and Sorghum Root Biomass, Carbon, and Nitrogen

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

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



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  		Fig. 1. (A) Mean monthly temperature and (B) total monthly rainfall from May to November in 2000, 2001, 2002, and the 41-yr average near the study site.

 


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  		Fig. 2. Effect of tillage on (A) biomass yield, (B) C concentration, (C) N concentration, (D) C accumulation, (E) N accumulation, and (F) C/N ratio of cotton roots from the 0- to 120-cm depth in 2000. CT denotes chisel till; NT, no-till; and ST, strip-till. LSD(0.05) is the least significant difference between treatments at P = 0.05.

 


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  		Fig. 3. Effect of tillage on (A) biomass yield, (B) C concentration, (C) N concentration, (D) C accumulation, (E) N accumulation, and (F) C/N ratio of sorghum roots from the 0- to 120-cm depth in 2001. CT denotes chisel till; NT, no-till; and ST, strip-till. LSD(0.05) is the least significant difference between treatments at P = 0.05.

 


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  		Fig. 4. Effect of cover crops on (A) biomass yield, (B) C concentration, (C) N concentration, (D) C accumulation, (E) N accumulation, and (F) C/N ratio of sorghum roots from the 0- to 120-cm depth in 2001. R denotes rye; V, hairy vetch; VR, hairy vetch and rye biculture; and WW, winter weeds. LSD(0.05) is the least significant difference between treatments at P = 0.05.

 




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