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Surface Biosolids Application

Effects on Infiltration, Erosion, and Soil Organic Carbon in Chihuahuan Desert Grasslands and Shrublands

^a USDA-ARS, Northwest Watershed Research Center, 800 Park Boulevard, Plaza IV, Suite 105, Boise, ID 83712
^b Department of Plant and Soil Science, Texas Tech University, Lubbock, TX 79409
^c Department of Range, Wildlife and Fisheries Management, Texas Tech University, Lubbock, TX 79409

View larger version (27K): [in a new window]   Fig. 1. Infiltration rate (cm h–1) during a 30-min simulated rainfall (164 mm h–1) for two Stellar soil cover conditions with 0, 7, 34, and 90 dry Mg ha–1 of biosolids: (A) bare Stellar soil and (B) vegetated Stellar soil. Steady-state infiltration values within the same level of cover labeled with the same letter are not different ( = 0.05).

View larger version (20K): [in a new window]   Fig. 2. Cumulative infiltration (cm) during a 30-min simulated rainfall (168 mm h–1, winter; 159 mm h–1, summer) for two trial seasons with two Stellar soil cover conditions and 0, 7, 34, and 90 dry Mg ha–1 of biosolids: simulated rain applied in (A) summer and (B) winter. Points with the same level of season and cover labeled with the same letter are not different ( = 0.05).

View larger version (25K): [in a new window]   Fig. 3. Cumulative infiltration (cm) and standard error bars during a 30-min simulated rainfall during three trials (166 mm, winter of 1994; 159 mm, summer of 1994; 167 mm, winter of 1995) for two Stellar soil cover conditions treated with 90 dry Mg ha–1 of biosolids on four different occasions (Batch 1, summer of 1993; Batch 2, winter of 1994; Batch 3, summer of 1994; and Batch 4, winter of 1995): (A) bare Stellar soil and (B) vegetated Stellar soil.

View larger version (20K): [in a new window]   Fig. 4. Cumulative erosion (Mg ha–1) during a 30 min simulated rainfall (79 mm) from three soil–cover combinations with 0, 7, 34, and 90 dry Mg ha–1 of biosolids. The analysis was performed on log-transformed cumulative erosion estimates, but the results are presented in back-transformed units. Points with the same level of "soil" labeled with the same letter are not different ( = 0.05).