Movement of herbicides under two irrigation regimes applied to turfgrass.pdf

Advances in Environmental Research 4Ž. 2000 169᎐176
Movement of herbicides under two irrigation regimes
applied to turfgrass ଝ
U
. Starretta, , . Christiansb, T. Al Austinc
a Ci¨il Engineering Department, Kansas State Uni¨ersity, Manhattan, KS 66506, USA
bHorticultural Department, Iowa State Uni¨ersity, Iowa, USA
c Ci¨il and Construction Engineering Department, Iowa State Uni¨ersity, Iowa, USA
Accepted 24 April 2000
Abstract
Our objective was to investigate the movement of the dimethylamine salt ofŽ. 2,4-dichlorophenoxy acetic acid
,4-D , dicamba, and 2- Ž 2-methyl-4-chlorophenoxy . propionic acid Ž MCPP . , when applied to Kentucky bluegrass turf
under both infrequent and frequent irrigation regimes. The turfgrass was established on 50-cm length and 20-cm
diameter undisturbed soil columns of NicolletŽ. fine-loamy, mixed, mesic-Aquic Hapludolls with intact macropores.
The infrequent irrigation regime consisted of four -cm applications, and the frequent regime consisted of 16
-cm applications. On average, the amounts of 2,4-D, dicamba, and MCPP recovered from the soil columns, and
in the leachate, under the infrequent irrigation regime were , , and %, respectively. The average amounts of
2,4-D, dicamba, and MCPP recovered from soil columns, and in the leachate, under the frequent irrigation regime
were , , and %, resp