이중웅 이두순 권태진 2018-11-15T07:51:39Z 2018-11-15T07:51:39Z 1981-12 R050 http://repository.krei.re.kr/handle/2018.oak/14096 지력증진의 경제성 분석 An Analysis of Economic Effects of Boosting Soil Fertility KREI 보고서 Lee, Joongwoong Lee, Doosoon Kwon, Taejin