| Title |
Effect of Surface Cover on the Reduction of NPS Pollution at a Vegetable Field |
| Authors |
신민환 ( Min Hwan Shin ) ; 장정렬 ( Jeong Ryeol Jang ) ; 원철희 ( Chul Hee Won ) ; 최용훈 ( Young Hun Choi ) ; 신재영 ( Jae Young Shin ) ; 임경재 ( Kyoung Jae Lim ) ; 최중대 ( Joong Dae Choi ) |
| Keywords |
NPS pollution; Radish; Runoff; Surface cover material |
| Abstract |
This research was focused on the effect of rice straw and rice straw mat on the reduction of upland field non-point source (NPS) pollution discharges. Six experimental plots of 5×22 m in size and 3% in slope prepared on gravelly sandy loam soil were treated with control, rice straw cover and rice straw mat cover. Radish in Spring growing seasons were cultivated. NPS pollution discharge was monitored and compared with respect to the treatments. The surface cover rate of rice straw and rice straw mat right after the treatments was 64.7% and 73.7%, respectively. Rainfall of the 16 monitored events ranged from 12.8 mm to 538.2 mm. Runoff coefficient of the events was 0.01~0.67 in control plot, 0~0.63 in rice straw plot and 0~0.45 in rice straw mat plot. The reduction of runoff compared to the control plot was 5.4~99.7% in rice straw plot and 32.9~100% in rice straw mat plot. The reduction of NPS pollution load was 52.0% for SS, 28.5% for T-N and 35.2% for T-P in rice straw plot and 79.8% for SS, 68.3% for T-N and 53.3% for T-P in rice straw mat plot. This research revealed that rice straw mat cover on the soil surface could not only increase the crop yield and farmer`s income but also reduce the NPS pollution loads significantly. |