Nonpoint source (NPS) pollution affects water quality, and the path of leakage discharge NPS pollutants is not clear. heavily influenced by weather conditions such as precipitation, making difficult to manage. The Soyang River watershed, in upper reaches Han River, dominated mountain farmland, which causes become turbid due soil erosion during rainfall. Therefore, South Korea's Ministry Environment has designated Mandae District an management area install manage various reduction facilities...

ABSTRACT A feasibility study on the system of rice intensification (SRI) methods with respect to irrigation requirements, non‐point source (NPS) pollution discharge, greenhouse gas (GHG) emissions and yields was conducted for either 2 or 3 years depending treatment in Korea. Large‐size runoff plots were prepared, necessary measuring systems installed. The SRI carried out a Japonica variety rice, Odaebyeo ( Oryza sativa L . ), results compared those control plots. data indicated high...

The objective of this research was to experimentally test the effect rice straw mats on reduction runoff, sediment discharge and turbidity under a laboratory scale. We used small runoff plots 1 m <TEX>${\times}$</TEX> 0.65 (<TEX>$L{\times}W{\times}H$</TEX>) in size filled with loamy sand. Experimental treatments were bare (control), mat cover + PAM Gypsum (SPG), Chaff (SCPG) Sawdust (SSPG); slope 10 % or 20 %; rainfall intensity 30 mm/hr. Runoff volume rate covered significantly lower than...

Various fundamental and practical theories technologies are needed for the development of Best Management Practices (BMPs) to manage problems. The objectives this paper was investigate effect fertilizer Non-point suource (NPS) pollution discharges from field. application measured with respect 10 % 20 slopes, respectively, using artificial rainfall simulator. on runoff not significant because slope intensity were overwhelmed. Runoff plots 21 larger than that plots. While groundwater discharge...

The accurate estimation of reference crop evapotranspiration (ETo) is essential in irrigation water management to assess the time-dependent status use and scheduling. importance ETo has resulted many direct indirect methods approximate its value include pan evaporation, meteorological-based estimations, lysimetry, soil moisture depletion, balance equations. Artificial neural networks (ANNs) have been intensively implemented for process-based hydrologic modeling due their superior performance...

Abstract Paddy fields comprise the single largest land use in Korea, occupying nearly 60% of arable land, consuming about 56% nation's water supply, and discharging a significant amount agricultural non‐point source (NPS) pollution to public waters. Rural resources conservation, improvement irrigation productivity (IWP) reduction NPS from paddy are important issues Korea. To quantify issue, field‐size rice‐plot study was conducted for 3 years comparing treatment system rice intensification...

Decision making by farmers regarding irrigation is critical for crop production. Therefore, the precision technique very important to improve quality and yield. Recently, much attention has been given remote sensing of canopy temperature as a water-stress indicator, because it scientifically based easily applicable method even at field scales. This study monitored series time-variant cucumber under three different treatments: under-irrigation (control), optimal-irrigation, over-irrigation....

Abstract A 2‐year runoff plot study was conducted under simulated rainfall to explore the effects of no‐till (NT) practice on ratio and NPS pollution in an intensive farming region Korea. Eight 5 × 30 m plots, four each 3 8% slopes, were prepared existing loamy sand fields. Cultivation two plots slope followed conventional (CT). Six simulations during study, a nominal 1 h duration mm ‐1 intensity. The NT decreased 64.9% compared with that CT plots. reduction load by treatment 88.3% (SS),...

Various Best Management Practices (BMPs) have been suggested to reduce Nonpoint source pollutant loads from agricultural fields. However, very little research regarding water quality improvement with sediment trap has performed in Korea. Thus, effects of were investigated this study. Three traps installed at the edge six plots and flow inflow outflow monitored analyzed. It was found that approximately 64.1 % reduction observed. In addition, concentration reduced by 39.0 for...

본 연구는 적외선 열 영상 장치를 이용하여 2년생 '유미' 복숭아나무의 토양수분 수준에 따른 엽온 및 CWSI를 분석하여 수분스트레스 측정 가능성을 검토하였다. 엽온은 대기온도와 유사한 일변화를 보이며 낮 시간대에는 대기온도보다 높은 양상을 보였다. 전일(24시간) 기준으로 대기온도(r2 = 0.95), 일사량(r2 0.74), 상대습도(r2 -0.88)와 모두 상관계수를 나타났다. 또한 토양수분장력은 시간대(11~16시)에 엽온(r2 -0.57), 엽-대기온도차(r2 -0.71), CWSI(r2 -0.72)와 부의상관을 나타냈다. CWSI와 엽온, 엽-대기온도차의 상관계수는 24시간 매우 높았고(r2 0.90, r2 0.92), 토양수분장력의 상관분석에서 기준으로는 상관관계가 낮았으나(r2 -0.27), 시간대(11~16시)에는 높았다(r2 -0.72). CWSI (y)와 토양수분장력(x)의 상관관계 결정계수(r2)는 11~12시간대에 가장 높았으며(r2 0.68), 이때...

The objective of the research was to describe effect straw mat cover and soil amendments on reduction runoff non-point source load from steep sloped highland agricultural fields. Four <TEX>$5{\times}30$</TEX> m plots sandy loam with 28 % slope were prepared. Experimental treatments bare (control), rice (3,000 kg/ha) (S), PAM (5 kg/ha)+Gypsum (1 ton/ha) (PG) cover+PAM+Gypsum (SPG). A variety lettuce cultivated monitored during a growing season in 2011. Natural monitoring conducted three...

This study conducted a series of field experiments using soil conditioners, Polyacrylamide(PAM) and gypsum, to evaluate their effects in reducing sediment loss surface runoff. In addition, the correction factors (K-alpha) for erodibility factor (K) were determined reflect PAM PAM+gypsum applying USLE equation. Experimental erosion plots individually sized <TEX>$10m^2$</TEX> (5 m long, 2 wide 1 deep) have different slopes (10, 20 30%). Erosion prepared one control (C; no gypsum) two...

Field study was carried out to assess the effect of automatic inlet and filtration outlet reduce non-point source discharge save agricultural irrigation water from paddy. The comparison control treated plots showed that saved up 58 mm reduced 110 mm. improved quality for SS, COD, TN TP 60.1 %, 0.1 4.5 26.0 respectively. Overall, findings this indicated pollution discharged paddy fields where were installed could be 266.3 kg/ha/yr in 10.3 1.22 TN, 0.10 TP, This clearly are effective...

The objective of this study was to experimentally investigate the feasibility SRI (system rice intensification) in Korean farming. Eight experimental plots <TEX>$5{\times}15$</TEX> m size were prepared on an existing field loam soil. Spacing <TEX>$30{\times}15$</TEX> cm (conventional treatment: CT), <TEX>$30{\times}30$</TEX> cm, <TEX>$40{\times}40$</TEX> and <TEX>$50{\times}50$</TEX> respectively. CT flooded irrigated intermittently 3 5 day interval during cultivation. Organic matter content...

This research focused on the investigation of runoff and nonpoint sources (NPS) pollution characteristics from small soil box plots treated by livestock waste composts. An indoor rainfall simulation was performed over for 60 minutes. Simulated intensities were 32.4, 43.2, 50.3 57.1 mm/hr respectively. Slope <TEX>$10^{\circ}$</TEX> <TEX>$20^{\circ}$</TEX>, Rainfall replicated 5 times experiment conducted every four days five times. As slope increased, NPS loads increased. And as intensity...

We have examined the effect of rice straw mat (RSM) on reduction non-point source (NPS) pollution loads at soybean cultivations. The slope experimental plot was about 3 %. Monitoring carried out for four years conventional tillage (CT) in 2008~2009 and RSM covered 2010~2011 years. Thirty-two rainfall events were monitored analyzed during study period. During 2 2008 2009, 20 runoff monitored. But 2010 years, only could be And 2011 10 It because cover enhanced infiltration reduce 2011. Average...

Flow and pollution load were monitored at 2 combined sewer outlets (C-1 C-2) of urban watersheds during dry weather from September, 2004 to April, 2006 for 20 months. The objectives investigate the diurnal variation flow pollutant find proper sampling time that could measure representative load. Pollution closed average daily C-1 be measured 00:00 hour by mean 15:00 18:00 measures, 21:00 respectively. In addition C-2, it was measures. This study concluded arbitrary water quality cause large...

Researchers developed Sediment Trap Drain Channel (STDC) as a solution of the reduction soil erosion and muddy runoff from alpine field. The STDC is one that can take role grit chamber by installing shield made woods in concrete channel. study was conducted 8 kinds stages according to amount loss inflow. Evaluation factors were ss concentration, turbidity reduced soil. results showed lessness concentration lower spot than upper spot. average rate 74 % 62 %. It turned out performance related...