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Runoff Losses of Phosphorus and Nitrogen Imported in Sod or Composted Manure for Turf Establishment

^a Soil and Crop Sciences Department, Texas A&M University, College Station, TX 77843
^b Biological and Agricultural Engineering Department, Texas A&M University, College Station, TX 77843

View larger version (20K): [in a new window]   Fig. 1. Mean mass of total dissolved phosphorus (TDP) in runoff summed over nine rain events and plotted in relation to soil-test P (acidified ammonium acetate EDTA extract) measured at end of the fall 2000 monitoring period. Regression lines and equations were developed separately for imported sod grown with manure or fertilizer and for sprigged treatments top-dressed with manure or fertilizer.

View larger version (22K): [in a new window]   Fig. 2. Mean mass of total dissolved phosphorus (TDP) in runoff summed over four rain events and plotted in relation to soil-test P (acidified ammonium acetate EDTA extract) measured at end of spring monitoring period. The mean losses for sprigged plots top-dressed with 50 or 100 kg P ha–1 as composted manure or 50 kg P ha–1 as fertilizer were not included in the regression relationship represented by the trend line plotted for control (soil-test P = 53 mg kg–1) and imported sod treatments.