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Effect of Roundup Ultra on Microbial Activity and Biomass from Selected Soils

Department of Soil & Crop Sciences, Texas Agricultural Experiment Station, Texas A&M Univ., College Station, TX 77843-2474

View larger version (42K): [in a new window]   Fig. 1. Carbon dioxide evolution from soil after applications of Roundup Ultra (product; applied at 3 x field rate) and analytical-grade glyphosate, and a control.

View larger version (22K): [in a new window]   Fig. 2. Effect of Roundup Ultra on daily carbon mineralization between 1 and 7 d from different soils with (A) 0.2 to 0.5% organic C, (B) 0.6 to 0.8% organic C, and (C) 0.9 to 2.6% organic C. Error bars indicate one standard deviation.

View larger version (21K): [in a new window]   Fig. 3. Effect of Roundup Ultra on cumulative carbon mineralization between 1 and 7 d from nine soils with (A) 0.2 to 0.5% organic C, (B) 0.6 to 0.8% organic C, and (C) 0.9 to 2.6% organic C. Error bars indicate one standard deviation.

View larger version (45K): [in a new window]   Fig. 4. Soil microbial biomass (A) carbon (SMBC) and (B) nitrogen (SMBN) with and without Roundup Ultra addition. Error bars indicate one standard deviation.

View larger version (35K): [in a new window]   Fig. 5. Mineralization for (A) carbon and (B) nitrogen, after 50 d of incubation for nine soils. Error bars indicate one standard deviation.

View larger version (23K): [in a new window]   Fig. 6. Regression analysis for (A) soil microbial biomass nitrogen (SMBN) vs. soil microbial biomass carbon (SMBC) with and without Roundup Ultra addition and (B) N mineralized vs. C mineralized in 50 d with and without Roundup Ultra addition.

View larger version (21K): [in a new window]   Fig. 7. Regression analysis of soil microbial biomass carbon (SMBC) determined at 14 d with (A) SMBC vs. 7-d C mineralization and (B) SMBC vs. 14-d C mineralization.