12,000

We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK

93%

93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Leaching of recently applied and aged residues ...
View graph of relations

« Back

Leaching of recently applied and aged residues of the herbicides atrazine and isoproturon through a large structured clay soil core.

Research output: Contribution to journalJournal article

Published

Journal publication date10/1996
JournalChemosphere
Journal number7
Volume33
Number of pages9
Pages1297-1305
Original languageEnglish

Abstract

Leaching of recently applied atrazine and isoproturon (2.475 kg/ha) through a large (1.1 m × 0.8 m in diameter), heavily cracked core of clay soil is compared with leaching of their aged residues twenty-one months later. Following application, herbicide losses were mainly from gravity drainage samplers at 0.55 m whilst 21 months later losses were mainly from samplers at 0.175 m. This change was due to differences in water flow regimes resulting from changes in the structure of the cultivated horizon between rainfall events. Nonequilibrium conditions were observed. After herbicide application, solution concentrations ranged from 1–26% and 1–34% of those predicted for atrazine and isoproturon respectively at equilibrium in the core top soil whilst twenty-one months later they ranged from 1–3% for both herbicides. Nonequilibrium became more pronounced with depth on both occasions. Over the course of four rainfall events comprising 353 mm, only 3% of the atrazine and 1% of the isoproturon applied to the core was recovered in drainage water.