Volume 5
Issue 1
Agronomy
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Available Online: http://www.ejpau.media.pl/volume5/issue1/agronomy/abs-02.html
PLANTS RESPONSE TO ISOXAFLUTOLE RESIDUES IN SOIL
Maria K. Swarcewicz, Prasanta C. Bhowmik, Sowmya Mitra
ABSTRACT
A plant bioassay technique was developed for detecting residues of isoxaflutole in the soil. Radish (Raphanus sativus L.), oilseed rape (Brassica napus L.), wheat (Triticum aestivum L.) and maize (Zea mays L.) were grown in treated soil with various concentrations of isoxaflutole. A Hadley fine sandy loam (Typic Udifluvents) soil (South Deerfield, MA) was used for bioassay study. Bioassay was conducted in a controlled growth chamber. Isoxaflutole inhibited the growth of radish and oilseed rape. Wheat was more tolerant to isoxaflutole even at concentrations several orders of magnitude higher than the concentrations used for radish and oilseed rape. Maize was tolerant to isoxaflutole in a fine sandy loam soil. The amount of the herbicide required to reduce the above-ground growth of test species by 50%, GR50 was estimated from dose-response data, using logistic regression curves.
Key words: isoxaflutole, plant bioassay, residues in soil, herbicides.