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Field persistence of chlorsulfuron and DPX‐L5300 in relation to rotational crops
Author(s) -
ELEFTHEROHORINOS I. G.,
KOTOULASYKA ELENI
Publication year - 1989
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1989.tb00850.x
Subject(s) - sunflower , phytotoxicity , bioassay , persistence (discontinuity) , germination , agronomy , sorghum , biology , horticulture , chemistry , geotechnical engineering , engineering , genetics
Summary A pot bioassay procedure, based on root growth of pre‐germinated maize was used to study residual phytotoxicity of chlorsulfuron and DPX‐L5300 methyl‐([4‐methoxy‐6‐methyl‐1,3,5‐triazin‐2‐yl(methyl) carbamoyl]sulphamoyl)benzoate under field conditions. The results indicate that residual bioactivity of both herbicides, applied either pre‐or post‐emergence at 5, 10, 20 and 40 g a.i. ha −1 , was increased with increasing rate of application. Chlorsulfuron persisted longer than DPX‐L5300, and both herbicides, when applied pre‐emergence, persisted longer than when applied post‐emergence. Pot bioassay did not detect any residues eight months after either application. Maize and sunflower, planted as rotational field crops eight months after pre‐emergence application, were not injured by either herbicide. Also, these crops were not affected when planted four months after post‐emergence application of any of the DPX‐L5300 rates or 5 or 10 g a.i. ha −1 of chlorsulfuron, but their fresh weight was significantly reduced where 20 or 40 g a.i. ha −1 of chlorsulfuron were applied.