Leaching potential of alachlor and picloram in disturbed and undisturbed soil columns

Document Type : Original Article

Authors

1 Department of Pesticide Chemistry, Faculty of Agriculture, University of Alexandria, El-Shatby, Alexandria, Egypt.

2 Institute of Chemistry and Dynamic Geosphere, Radioagronomy Research Center, Jülich, Germany.

10.21608/jpces.2002.459580

Abstract

Abstract:
The leaching of pesticides in soil as well as reaching groundwater is a considerable problem. It provokes a major   environmental risk and pollution. Using disturbed and undisturbed soil columns was to investigate the leaching of two herbicides, alachlor and picloram and bromide as a water tracer in a German soil (Merzenhausen, WIER). The tested concentration of alachlor (analytical grade substance and [U- 14C] alachlor) was equivalent to 1.7kg a.i./ha. and the combination of 14C-labeled and unlabeled picloram yielded an application rate of 0.49 kg a.i./ha. The results showed that the picloram breakthrough curves (BTCs) in disturbed and undisturbed soil columns were identical to that of bromide (which is in a symmetrical form), but the BTCs of picloram exhibited some tailing. Alachlor was less mobile in both soil types than bromide and the BTCs of alachlor included two or three peaks. Approximately 56 and 25 % of 14C-alachlor were leached, while about 89 and 96 % of NC-picloram were leached in the case of disturbed and undisturbed soil columns, respectively. According to the above data as well as the distribution pattern of the two tested compounds in the soil layers, picloram was more leached than alachlor. The risk of picloram to reach groundwater is pronounced. Thus, the timing of irrigation during the period after picloram application must be managed.
Journal of Pest Control and Environmental Sciences
Volume 10, Issue 1
2002
Pages 99-114

Files

Share

How to cite

Statistics