title: Estimation of nutrients and organic matter in Korean swine slurry using multiple regression analysis of physical and chemical properties.
abstract: Swine waste land application has increased due to organic fertilization, but excess application in an arable system can cause environmental risk. Therefore, in situ characterizations of such resources are important prior to application. To explore this, 41 swine slurry samples were collected from Korea, and wide differences were observed in the physico-biochemical properties. However, significant (P<0.001) multiple property correlations (R²) were obtained between nutrients with specific gravity (SG), electrical conductivity (EC), total solids (TS) and pH. The different combinations of hydrometer, EC meter, drying oven and pH meter were found useful to estimate Mn, Fe, Ca, K, Al, Na, N and 5-day biochemical oxygen demands (BOD₅) at improved R² values of 0.83, 0.82, 0.77, 0.75, 0.67, 0.47, 0.88 and 0.70, respectively. The results from this study suggest that multiple property regressions can facilitate the prediction of micronutrients and organic matter much better than a single property regression for livestock waste.
authors.affiliation: Department of Agricultural Biotechnology and Research Institute for Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University, Gwanak-ku, Seoul 151-921, Republic of Korea.
authors.forename: Arumuganainar
authors.initials: A
authors.lastname: Suresh
authors.forename: Hong Lim
authors.initials: HL
authors.lastname: Choi
mesh_terms: D000824:Animal Nutritional Physiological Phenomena / Q000502:physiology*; D000818:Animals; D057919:Biological Oxygen Demand Analysis; D004553:Electric Conductivity; D006863:Hydrogen-Ion Concentration; D008372:Manure / Q000032:analysis*; D019216:Metals, Heavy / Q000032:analysis; D009930:Organic Chemicals / Q000032:analysis*; D012044:Regression Analysis; D056910:Republic of Korea; D013046:Specific Gravity; D013552:Swine
chemical_list: D008372:Manure; D019216:Metals, Heavy; D009930:Organic Chemicals