Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Rate of bentazone transformation in four layers of a humic sandy soil profile with fluctuating water table
Autore:
Leistra, M; Smelt, JH; Matser, AM; Bogte, JJ; van der Pas, LJT;
Indirizzi:
Univ Wageningen & Res Ctr, Alterra Green World Res, NL-6700 AA Wageningen,Netherlands Univ Wageningen & Res Ctr Wageningen Netherlands NL-6700 AA ,Netherlands Natl Inst Publ Hlth & Environm, NL-3720 BA Bilthoven, Netherlands Natl Inst Publ Hlth & Environm Bilthoven Netherlands NL-3720 BA herlands
Titolo Testata:
PEST MANAGEMENT SCIENCE
fascicolo: 11, volume: 57, anno: 2001,
pagine: 1023 - 1032
SICI:
1526-498X(200111)57:11<1023:ROBTIF>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
HERBICIDE; ETHOPROPHOS; DEGRADATION; SUBSOILS; SURFACE;
Keywords:
aquifer; bentazone; chemical analysis; degradation; herbicide; microbial activity; nutrients; pesticide; subsoil;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Leistra, M Univ Wageningen & Res Ctr, Alterra Green World Res, POB 47, NL-6700 AA Wageningen, Netherlands Univ Wageningen & Res Ctr POB 47 Wageningen Netherlands NL-6700 AA
Citazione:
M. Leistra et al., "Rate of bentazone transformation in four layers of a humic sandy soil profile with fluctuating water table", PEST MAN SC, 57(11), 2001, pp. 1023-1032

Abstract

The rate of transformation of a pesticide as a function of the depth in the soil is needed as an input into computations on the risk of residues leaching to groundwater. The herbicide bentazone was incubated at 15 degreesC in soil materials derived from four layers at depths of up to 2.5 m in a humic sandy soil profile with a fluctuating water table (0.8 to 1.4m), while simulating the redox conditions existing in the field. Gamma-irradiation experiments indicated that bentazone is mainly transformed by microbial activity in the soil. The rate constant for transformation was highest in the humic sandy top layer; it decreased with depth in the sandy vadose subsoil. However, material from the top of the phreatic aquifer had a higher rate constant than that from the layers just above. The presence of fossil organic material in the fluviatile water-saturated sediment probably stimulated microbial activity and bentazone transformation. The changes in the transformation rate constant with depth showed the same trend as those in some soil factors, viz organic carbon content, water-extractable phosphorus and microbial density as measured by fluorescence counts. However, the (low) concentration of dissolved organic carbon (DOC) in the top of the aquifer did not fit the trend. The rate constant for bentazone transformation in the layers was higher at lower initial contents of the herbicide. (C) 2001 Society of Chemical Industry.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 09:43:46