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Titolo:
EVALUATION OF 3 PESTICIDE LEACHING MODELS WITH EXPERIMENTAL-DATA FOR ALACHLOR, ATRAZINE AND METRIBUZIN
Autore:
WALKER A; WELCH SJ; MELACINI A; MOON YH;
Indirizzi:
HORT RES INT WELLESBOURNE CV35 9EF WARWICK ENGLAND
Titolo Testata:
Weed Research
fascicolo: 1, volume: 36, anno: 1996,
pagine: 37 - 47
SICI:
0043-1737(1996)36:1<37:EO3PLM>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
COMPUTER-MODEL; SOIL; PERSISTENCE; SIMULATION; MOVEMENT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
A. Walker et al., "EVALUATION OF 3 PESTICIDE LEACHING MODELS WITH EXPERIMENTAL-DATA FOR ALACHLOR, ATRAZINE AND METRIBUZIN", Weed Research, 36(1), 1996, pp. 37-47

Abstract

The persistence and movement of residues of alachlor, atrazine and metribuzin were measured in a mini-lysimeter system in the field. This comprised a number of soil columns (11 cm diameter; 30 cm long), and permitted the vertical distribution of residues to be determined at intervals after application and the collection and analysis of leachate water. Laboratory experiments were also performed to determine the degradation rates of the three herbicides and their strengths of adsorptionby the test soil. The results showed an order of degradation rate of metribuzin>alachlor>atrazine and an order of adsorption of alachlor>atrazine>metribuzin. Movement of residues in the soil columns and concentrations in the leachate were inversely related to the strength of adsorption. Parameters derived from the laboratory data were used in conjunction with weather data for the period of the field experiment in three mathematical models of pesticide leaching: VARLEACH, LEACHP and PRZM2. In most instances, the models gave acceptable predictions of the distribution of residues in soil. This aias particularly so for the less mobile compound alachlor. With the most mobile compound, metribuzin, residues were not well predicted at the later sampling dates. All three models gave accurate predictions of the volumes of drainage water,but none of them predicted the concentrations of herbicide in the leachate, presumably because they do not take account of preferential nowpathways of water and solute in the soil.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 05:24:48