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Soil Aggregation and Carbon and Nitrogen Pools under Rhizoma Peanut and Perennial Weeds

Agricultural Res. Stn., Fort Valley State Univ., 1005 State University Drive, Fort Valley, GA 31030

View larger version (31K): [in a new window]   Fig. 1. Concentrations of (A) NH4–N, (B) potential C mineralization, and (C) microbial biomass C in whole-soil from the 0- to 90-cm depth under rhizoma peanut and weeds. Bars followed by different letters are significantly different between peanut and weeds and between soil depths at P 0.05 by the least square means test.

View larger version (35K): [in a new window]   Fig. 2. (A) Amount of particles as fragments retained in a 0.05-mm sieve used for determining particulate organic C and N after wet sieving of whole-soil extracted with sodium hexametaphosphate (particles > 0.05 mm), and (B) concentration of particulate organic N in whole-soil from the 0- to 90-cm depth under rhizoma peanut and weeds. Bars followed by different letters are significantly different between peanut and weeds and between soil depths at P 0.05 by the least square means test.