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Titolo:
Designing herbicide formulation characteristics to maximize efficacy and minimize rice injury in paddy environments
Autore:
Cryer, SA; Mann, RK; Erhardt-Zabik, S; Keeney, FN; Handy, P;
Indirizzi:
Dow AgroSci, Indianapolis, IN 46268 USA Dow AgroSci Indianapolis IN USA 46268 AgroSci, Indianapolis, IN 46268 USA
Titolo Testata:
PEST MANAGEMENT SCIENCE
fascicolo: 6, volume: 57, anno: 2001,
pagine: 479 - 490
SICI:
1526-498X(200106)57:6<479:DHFCTM>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Keywords:
herbicide; rice; paddy; formulation; efficacy; model;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Cryer, SA Dow AgroSci, 9330 Zionsville Rd, Indianapolis, IN 46268 USA Dow AgroSci 9330 Zionsville Rd Indianapolis IN USA 46268 268 USA
Citazione:
S.A. Cryer et al., "Designing herbicide formulation characteristics to maximize efficacy and minimize rice injury in paddy environments", PEST MAN SC, 57(6), 2001, pp. 479-490

Abstract

Mathematical descriptors, coupled with experimental observations, are usedto quantify differential uptake of an experimental herbicide in Japonica and Indica rice (Oryza sativa, non-target) and barnyardgrass (Echinochloa crus-galli, target). Partitioning, degradation, plant uptake and metabolism are described using mass-balance conservation equations in the form of kinetic approximations. Estimated environmental concentrations, governed by the pesticide formulation, are described using superimposed analytical solutions for the one-dimensional diffusion equation in spherical coordinates and by a finite difference representation of the two-dimensional diffusion equation in Cartesian coordinates. Formulation attributes from granules include active ingredient release rates, particle sizes, pesticide loading, and granule spacing. The diffusion model for pesticide transport is coupled with the compartment model to follow the fate and transport of a pesticide from its initial application location to various environmental matrices of interest. Formulation effects, partitioning and degradation in the various environmental matrices, differential plant uptake and metabolism, and dose-response information for plants are accounted for. This novel model provides a mechanism for selecting formulation delivery systems that optimize specific attributes (such as weed control or the therapeutic index) for risk-assessment procedures. In this report we describe how this methodology was used to explore the factors affecting herbicide efficacy and to define an optimal release rate for a granule formulation. (C) 2001 Society of Chemical Industry.

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Documento generato il 26/01/20 alle ore 09:54:55