EFFECT OF SRI ON WATER USE EFFICIENCY AND NPS POLLUTION DISCHARGE

摘要

To describe the effects of the system of rice intensifi cation (SRI) on water use effi ciency andnon-point source (NPS) pollution discharge, a fi eld experiment was conducted for three yearsat a university farm in Korea. Experimental treatments were conventional rice cultivation(CT) and SRI cultivation methods. Runoff plots 5x15 m in size were prepared at an existingpaddy fi eld. Runoff and water quality were measured during the 2010~2012 growing seasons.A Japonica rice variety was cultivated. Irrigation requirement of the SRI plots compared tothe CT plots reduced by 45.5~55.6% for three years, meaning that about 50% of irrigationwater could be saved. Compared to the CT plots, the SRI plots increased irrigation water useeffi ciency (IWUE) by up to 124%. Runoff from SRI plots decreased 5~24% compared with thatfrom the CT plots. NPS pollution loads (3-year average) from the SRI plots were SS 595.7 kg/ha, CODCr 179.3 kg/ha, CODMn 60.2 kg/ha, BOD 20.8 kg/ha, TN 40.3 kg/ha, and TP 2.7 kg/ha, which were 23.8~44.4% lower than those from the CT plots. Average concentrations ofthe selected pollutants from the SRI plots also were 14.6~42.8% lower than those from the CTplots. These results indicated that the application of SRI methods in Korea could signifi cantlydecrease paddy irrigation requirements, increase IWUE and reduce NPS pollution dischargesfrom paddy fi elds.