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( Choi Joong Dae ),( Shirmohammadi Adel ),( Ryu Neung Hwan ),( Choi Ye Hwan ) 한국농공학회 1992 韓國農工學會誌 : 전원과 자원 Vol.34 No.-
Increasing national concern on nonpoint source pollution of surface and ground water Systems has led researchers and policy makers to develop certain agricultural Best Management Practices. As an initial step of broad study program above mentioned, this study reflected the effects of different tillage practice on bulk density and degree of saturation on two regional soils, namely Tama silt loam and Catlin silt loam. Results may help to clarify some of the conflicting findings on the impact of tillage systems on these parameters and it may also explain some of the reasons for specific role that different tillage systems play regarding nonpoint source pollution from agricultural fields.
Event Mean Concentration of Nitrogen and Phosphorus from a Dairy and Crop Farming Complex Watershed
Yoon, Kwang-Sik,Shirmohammadi, Adel,Choi, Woo-Jung,Jung, Jae-Woon The Korean Society of Agricultural Engineers 2006 한국농공학회논문집 Vol.48 No.7
Event mean concentration (EMC) of nitrogen (N) and phosphorus (P) is primary information for non-point source pollution assessment of a watershed. The EMCs for various types of agriculture such as dairy and crop farming under different climate and geologic conditions are not fully investigated. A diary- and cropfarming complex agricultural watershed in Piedmont region in Maryland, USA has been monitored for 10 years as a section 319 national monitoring program of US EPA. Dairy manure was the main source of fertilizer for crop farming in this watershed. Observed mean concentrations of N and P for each event were analyzed. Distribution of EMCs for N and P showed a wide range of variations. Representative EMCs of T-N and $NO_{3}-N$ tended to be higher than those reported for other agricultural watersheds. This study confirmed that site-specific EMC information for various agricultural practices is required for better assessment of non-point source pollution using EMC method.
Event Mean Concentration of Nitrogen and Phosphorus from a Dairy and Crop Farming Complex Watershed
( Kwang-sik Yoon ),( Adel Shirmohammadi ),( Woo-jung Choi ),( Jae-woon Jung ) 한국농공학회 2006 한국농공학회논문집 Vol.48 No.7
Event mean concentration (EMC) of nitrogen (N) and phosphorus (P) is primary information for non-point source pollution assessment of a watershed. The EMCs for various types of agriculture such as dairy and crop farming under different climate and geologic conditions are not fully investigated. A diary- and crop-farming complex agricultural watershed in Piedmont region in Maryland, USA has been monitored for 10 years as a section 319 national monitoring program of US EPA. Dairy manure was the main source of fertilizer for crop farming in this watershed. Observed mean concentrations of N and P for each event were analyzed. Distribution of EMCs for N and P showed a wide range of variations. Representative EMCs of T-N and NO<sub>3</sub>-N tended to be higher than those reported for other agricultural watersheds. This study confirmed that site-specific EMC information for various agricultural practices is required for better assessment of non-point source pollution using EMC method.