Application of the RICEWQ-VADOFT model for simulating the environmental fate of pretilachlor in rice paddies.

نویسندگان

  • Dimitrios Georgios Karpouzas
  • Aldo Ferrero
  • Francesco Vidotto
  • Ettore Capri
چکیده

No validated models in Europe are capable of simulating the environmental fate of pesticides under the specific conditions of rice fields. Rice water quality--vadose zone flow and transport (RICEWQ-VADOFT) is a model developed from the coupling of a surface runoff model (RICEWQ) and a vadose zone flow and transport model (VADOFT) for determining predicted environmental concentrations in paddy water and sediment, runoff, and groundwater. This study is intended to evaluate the capability of this model to simulate effectively the environmental fate of the herbicide pretilachlor in the paddy environment. A two-year field study conducted in a representative rice-cultivated area of northern Italy provided measured concentrations of pretilachlor in paddy water and sediment and also a limited number of observations on runoff losses. The model successfully predicted the water balance in the paddy field in both years. After limited calibration, the model predicted the fate of pretilachlor in paddy water and sediment with high accuracy. Agreement between predicted and measured concentrations of pretilachlor in both years was assessed statistically using several statistical indicators. For example, modeling efficiency (EF) values of 0.867 to 0.935 and 0.702 to 0.718 in paddy water and sediment, respectively, document the strong agreement between predicted and measured pesticide concentrations. The model predictions showed high agreement with the limited amount of measured runoff data in 2002. The model predicted that no significant amounts of pretilachlor would leach below the top 25 cm of the soil, although no measured data were available to evaluate the predicted results. A sensitivity analysis of the model to variables controlling pesticide partitioning to paddy sediment (VBIND, depth for direct partitioning of pesticide to bed sediment; VMIX, mixing velocity by molecular diffusion) revealed that the predictions of pesticide leaching were influenced strongly by those variables. Generally the RICEWQ-VADOFT model is a useful modeling tool for pesticide risk assessment in rice paddies.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Pesticide exposure assessment in rice paddies in Europe: a comparative study of existing mathematical models.

A comparative test was undertaken in order to identify the potential of existing mathematical models, including the rice water quality (RICEWQ) 1.6.4v model, the pesticide concentration in paddy field (PCPF-1) model and the surface water and groundwater (SWAGW) model, for calculating pesticide dissipation and exposure in rice paddies in Europe. Previous versions of RICEWQ and PCPF-1 models had ...

متن کامل

Simulating the Herbicide Molinate in Rice Paddies Using the RICEWQ Model

Contamination of drainage channels and creeks with pesticides used in rice production is of concern in south-eastern Australia. Of major concern is the herbicide molinate that is detected in over 25% of water samples. This pesticide has been the focus of researchers and environmental protection authorities due to continuing frequent detection off-farm despite improved application methods and wa...

متن کامل

The Feasibility Study of Utilizing Common Herbicides of Transplanted Rice for Direct Wet-Seeding of Hashemi Cultivar

To investigate some common herbicides of transplanted rice for direct wet-seeding of Hashemi cultivar, this study was conducted in a randomized complete block design with three replications. Treatments were as follow: (i) recommended dose of pretilachlor, (ii) oxadiargyl + bensulfuron-methyl, (iii-vi) adding propanil or thiobencarb to treatment (i) and (ii), (vii-x) adding cinosulfuron to treat...

متن کامل

Report 263: Review and Evaluation of Pesticide Modeling Approaches in Rice Paddies

 The model evaluation is based on the latest version of the models at the time of this study (RICEWQ v1.73, PCPF v3.01, and PFAM v0.5) available at the time of study. All models, including executable files and/or source codes, were obtained from the model developers. The results of model evaluation in this study may not be appropriate for the updated model versions in the future. For example, ...

متن کامل

The Evaluation of Economic Impact of Equipped – Renovated Rice Paddies in Villages of Central District of Soome-e Sara

Iran’s agricultural sector comparing with the other economic sector suffers from subsistence method. Small farm size, scatter distribution of holdings, lack of an appropriate irrigation and drainage systems, and non-existence of roads between farms have led to increase in production costs and reluctance regarding agriculture activities and relevant investment. This in turn demands the implement...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Environmental toxicology and chemistry

دوره 24 4  شماره 

صفحات  -

تاریخ انتشار 2005