Runoff Water Quality as Affected by Surface-applied Dairy Cattle Manure1
- F. Leslie Long2
The effect of dairy cattle manure on runoff water quality was determined. The manure was surface-applied to Coastal bermudagrass (Cynodon dactylon [L.] Pers.) on a Norfolk sandy loam with < 2% slope, at the rate of 45 metric tons/ha per year for 4 years in split applications. Manure applications slightly increased biochemical oxygen demand (BOD) values of runoff water; the maximum value was < 20 mg/liter and annual mean values were all < 10 mg/liter with no BOD buildup in the runoff water over the 4-year period. Nitrate levels in runoff water were increased by the manure, but all annual mean values were below critical levels at < 8 mg NO3-N/liter. During the first 2 years, about 30 kg/ha total N was lost in runoff, but < 6 kg N/ha was lost during the third and fourth years.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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