Leaching of atrazine, metolachlor and diuron in the field in relation to their injection depth into a silt loam soil

Chemosphere
J E Delphin, J Y Chapot

Abstract

A field experiment was conducted on a Calcaric Cambisol soil to study the consequences of the penetration depth and properties of pesticides on the risk of subsequent leaching. Three pesticides with different mobility characteristics and bromide were injected at 30 cm (where soil organic matter (OM) was 2%) and 80 cm (soil OM 0.5%) on irrigated plots without a crop. The migration of injected solutes was assessed for two years by sampling the soil solution using six porous cups installed at 50 and 150 cm depth and by relating solute contents to drainage water flux estimated by the STICS model (Simulateur mulTIdisciplinaire pour les Cultures Standard). Pesticides injected at 30 cm were strongly retained so that no metolachlor or diuron was detected at 50 and 150 cm. The ratio of atrazine peak concentration in the soil solution to concentration in the injected solution (C/C(0)) was 1 x 10(-3) and 0.2 x 10(-3), respectively, at 50 and 150 cm. When injected at 80 cm, (C/C(0)) of atrazine, metolachlor and diuron were 10 x 10(-3), 1 x 10(-3) and 0.3 x 10(-3) at 150 cm, respectively; 1/(C/C(0)) was correlated with K(oc) values reported from databases. The ratio of drainage volume to the amount of water at field capacity in the soil lay...Continue Reading

References

Sep 12, 2002·Chemosphere·Guangwei DingBaoshan Xing
Dec 3, 2003·Journal of Agricultural and Food Chemistry·Larry Jason KrutzDennis Patrick Tierney

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