배추와 무밭에서 발생하는 비점오염원 저감을 위한 피복재와 토양개량제 적용

초록

The objective of the study was to investigate the effect of rice straw mat, rice straw mat with PAM (Polyacrylamide) and gypsumaddition on surface runoff and sediment discharge in field. Six experimental plots of 5×22 m in size and 3 % in slope prepared ongravelly sandy loam soil were treated with control, rice straw mat cover with gypsum and rice straw mat cover with gypsum andPAM. Radish in Spring and Chinese cabbage in autumn growing seasons were cultivated. Non point source (NPS) pollution dischargewas monitored and compared among the treatments. Rainfall of the 10 monitored events ranged from 17.0 mm to 93.5 mm. Runoffcoefficient of the events was 0.005～0.239 in control plot, 0～0.176 in rice straw plot with gypsum and 0～0.046 in rice straw matplot with gypsum and PAM. When compared to the control plot, the runoff amount was reduced by 10.4～100 % (Ave. 60.8) inrice straw plot with gypsum and 80.7～100 % (Ave. 96.7 %) in rice straw mat plot with gypsum and PAM. The reduction of NPSpollution load was 54.6 % for BOD5, 71.5 % for SS, 41.6 % for TN and 61.4 % for T-P in rice straw with gypsum plot and 91.9 %for BOD5, 92.0 % for SS, 88.0 % for TN and 88.5 % for T-P in rice straw mat with gypsum and PAM plot. This research revealedthat rice straw mat cover with soil amendments on the soil surface could not only increase the crop yield but also reduce the NPSpollution loads substantially.

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