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Scenario-Based Simulation for Molinate Concentrations in Rice Paddies Using RICEWQ Model
Reports NRF is supported by Research Projects( Scenario-Based Simulation for Molinate Concentrations in Rice Paddies Using RICEWQ Model | 2005 Year 신청요강 다운로드 PDF다운로드 | 박기중(경북대학교) ) data is submitted to the NRF Project Results
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  • Researchers have entered the information directly to the NRF of Korea research support system
Project Number D00093
Year(selected) 2005 Year
the present condition of Project 종료
State of proposition 재단승인
Completion Date 2007년 02월 05일
Year type 결과보고
Year(final report) 2007년
Research result report
  • Abstract
  • 본 연구에서는 주변 수계 환경에서 노출 빈도가 가장 높은 논에 대하여 다양한 환경 조건 하에서의 농약의 반응 기작을 연구함으로써 농약에 의한 수질 오염을 저감하기 위한 최적관리기법을 제시하였다. 농약의 반응 기작은 기상 환경, 수문․지질학적 환경 및 재배․관리 방법에 따라 다양하게 나타나 이를 구명하기에는 시간과 비용 및 전문 인력에 많은 한계가 있다. 따라서 논 담수 내에서의 농약 농도 변화를 예측하기 위하여 미국과 유럽 등에서 검정되고 광범위하게 이용하고 있는 논 농약 거동 모형인 RICEWQ 모형을 적용하였다.
    시험 농약은 논 제초제로서 많이 이용하고 있으며, 주변 수계 환경에서 노출 빈도가 높고 특히 내분비계 장애 의심물질로 등록되어 있는 molinate를 선정하였다. 기존 농약 사용 지침에서는 molinate 살포 후 3일에서 4일까지 논의 배수를 금지하는 것으로 나타나 있다. 논에서의 물수지 및 농약의 농도는 대구시 북구 서변동 일대의 논 포장에서 벼 재배기간인 2006년 5월에서 9월까지 관측하였다. RICEWQ 모형의 적용성을 평가한 결과 관측한 논에서의 물수지 및 농약 농도는 관측값과 모형 추정값이 잘 일치하는 것으로 나타났다.
    농약의 반응 기작에 대한 연구의 한계를 극복하고 최적관리기법 설정 시 대표성을 가지기 위하여 1997년부터 2006년까지 10년간에 대한 시험지구의 기상자료를 이용하여 다양한 재배․관리 조건(물관리 방법, 농약 살포량 및 농약 살포 방법)에서 시나리오 분석을 수행하고 각 시나리오 별 수서 생물들에 대해 위해성 평가를 실시하였다. 시나리오 분석 결과 molinate가 살포된 논의 경우 수서 생태계 보호를 위해서는 살포 후 최소 26일까지는 배수를 억제하여야 할 것으로 나타났다. 추가해서 시나리오 분석을 통하여 도출된 결과를 토대로 하여 농약에 의한 수질 오염을 저감할 수 있는 최적농약관리기법을 제시하였다.
    본 연구의 결과는 농약에 대한 비점원오염 관리 기술 개발, 환경 정책 및 농약에 대한 수질 관리 지침 수립 시 활용 가능할 뿐만 아니라, 지속가능한 농업을 위한 농약 최적농약관리기법 개발에 기초 자료로서 이용 가능할 것으로 판단된다.
  • Research result and Utilization method
  • The specific objectives of this research are: to investigate the applicability of the RICEWQ model in Korean conditions; to conduct scenario analysis under different water and pesticide conditions using the RICEWQ model; to assess the molinate risk for adjacent aquatic organisms various scenarios; to propose an appropriate withholding period of discharge water from the paddy plot through a risk assessment, in order to prevent adverse effects on populations; and to propose best management practices(BMPs) for ecosystem conservation.
    Results to predict the molinate concentrations in rice paddies and to examine the potential of pesticides contaminate water resources under realistic local agricultural scenario are summarized following.

    1. In order to calibrate the RICEWQ model, an experimental paddy plot of 0.2ha(100×20m) at Seobyeon-dong, Daegu, in Korea was selected. Field observation was performed from 4 June to 2 September 2006. Molinate that a selective thiocarbamate herbicide used to control broad-leaved and grassy plants in rice was selected. Field observation was performed from 4 June to 2 September 2006. The results of the model simulation were well matched to the observed water depths(Fig. 5-4). The ponded water depths had an RMSE of 0.537cm, and the REE was 0.301cm. The low RMSE and REE values, and the high EF(0.909) and CNS(0.909) values demonstrate a high accord between observed and predicted water depths. Molinate concentrations in ponded water had an RMSE of 0.036mg/L, and the REE was 0.061mg/L.

    2. The calibrated model was used in scenario analysis to understand the potential effect of the predicted molinate concentrations with different water depths and various pesticide management practices(amount and treatment method). The scenarios were run between 4 June and 2 September for 1997-2006, using the same parameter values as those that were used for the initial calibration.

    3. Based on the water management scenario analysis, it was concluded that the very shallow irrigation method could ensure a sustainable water resource and also had the benefit of protecting aquatic ecosystems from pesticide exposure. On the other hand, very shallow irrigation must be carefully attended for the first 5 DATs, as during this time the molinate concentration is very high.

    4. Based on the pesticide treatment amount scenario analysis, the withholding periods for a molinate treatment of double the label rate in rice paddies with deep, shallow and very shallow conditions is recommended, over the 37.0, 34.0 and 31.0 DATs, respectively. These results of the pesticide treatment amount scenario analysis show that using the application rate specified on the label will provide the most effective and economic pest management.

    5. Based on the pesticide treatment amount scenario analysis, the withholding periods for a molinate treated by power granule sprayer under the deep, shallow and very shallow irrigation conditions were evident after 33.0, 28.6 and 25.4 DATs, respectively. Therefore, it is recommended that the withholding period for these conditions, to prevent the adverse ecological effects on populations, should be more than 26.0 DATs. Recently, granule formulations including molinate have been used widely to control pests. However, the existing sprayer was developed for wettable and dustable powder, not for granules. If an improved sprayer were developed that could prevent to drift in the air, the utilization of this sprayer could save labour, time and money, and decrease the risks associated with granular pesticide.

    6. The most important element in BMPs for aquatic ecosystem conservation is the use of the withholding period in rice paddies. The withholding period in the case of molinate used in rice paddies has been about 3 to 4 DATs, as recommended by the pesticide label in Korea. In the results of this study, for adjacent aquatic organism conservation, the withholding period must be more than 26.0 DATs.
  • Index terms
  • RICEWQ;risk assessment;scenario analysis;BMPs;withholding period;rice;pesticide;molinate;PEC;PNEC
  • List of digital content of this reports
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