관개기 시험구 논에서의 오염물질의 농도특성
Pollutant Concentrations at Experimental Paddy Plotsduring Irrigation Season
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Abstract
The pollutant concentrations at experimental paddy plots with three (excessive, standard, reduced) different fertilization rates were investigated during 2001-2002 irrigation seasons. Mean concentrations of pollutants in ponded water were not significantly different among three experimental plots, but the T-N concentrations in percolated water significantly depended on fertilization rates. The T-N, T-P and CODCr concentrations in ponded water during early irrigation season (late May to mid-June) were much higher than those during later irrigation season likely due to fertilization and low uptake by young rice crops. The T-N concentrations decreased but the concentrations of T-P and CODCr increased three days after tillering fertilization. The removal rates of T-N by paddy plots were 0.13-0.16 g/m2·d for an excessive fertilization plot, 0.08-0.25 g/m2·d for a standard fertilization plot, and 0.03-0.34 g/m2·d for a reduced fertilization plot three days after tillering fertilization. On the other hand, T-P and CODCr were released three days after tillering fertilization.
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