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Predicting Runoff of Suspended Solids and Particulate Phosphorus for Selected Louisiana Soils Using Simple Soil Tests

^a School of Plant, Environmental, and Soil Sciences, Sturgis Hall, Louisiana State Univ. Agricultural Center, Baton Rouge, LA 70803
^b Dep. of Plant and Soil Sciences, Oklahoma State Univ., Stillwater, OK 74078. Contribution of Louisiana Agric. Exp. Stn. Journal No. 06-14-0300 and is published with the approval of the Director

View larger version (12K): [in this window] [in a new window]   Fig. 1. Relationship between runoff total suspended solids (TSS) and runoff turbidity for selected Louisiana soils.

View larger version (10K): [in this window] [in a new window]   Fig. 2. Relationships between runoff particulate phosphorus (PP) and runoff total suspended solids (TSS) for selected Louisiana soils.

View larger version (21K): [in this window] [in a new window]   Fig. 3. Relationships between runoff characteristics and soil clay content for selected Louisiana soils: (a) runoff total suspended solids (TSS) and soil clay content; (b) runoff turbidity and soil clay content.

View larger version (10K): [in this window] [in a new window]   Fig. 4. Relationship between soil suspension turbidity (SST) and soil clay content. The SST was measured based on 24 h shaking followed by 7 h settling.

View larger version (27K): [in this window] [in a new window]   Fig. 5. Relationship between runoff total suspended solids (TSS) and soil suspension turbidity (SST) measured after: (a) 1 h shaking, no settling; (b) 1 h shaking, 7 h settling; (c) 24 h shaking, no settling (d); 24 h shaking, 7 h settling.

View larger version (12K): [in this window] [in a new window]   Fig. 6. Relationship between runoff turbidity and soil suspension turbidity (SST). The SST was measured after 24 h shaking followed by 7 h settling.

View larger version (9K): [in this window] [in a new window]   Fig. 7. Relationship between runoff total suspended solids (TSS) and soil electrical conductivity (EC). Soil EC was measured in 1:2 soil/water mixture.

View larger version (9K): [in this window] [in a new window]   Fig. 8. Relationship between runoff particulate phosphorus (PP) and soil electrical conductivity (EC). Soil EC was measured in 1:2 soil/water mixture.