Premium
Factors affecting glyphosate activity in Imperata cylindrica (L) Beau, and Cyperus votundus L. I. Effect of soil moisture
Author(s) -
MOOSAVINIA H.,
DORE J.
Publication year - 1979
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.1365-3180.1979.tb01586.x
Subject(s) - imperata , cyperus rotundus , rhizome , glyphosate , shoot , water content , agronomy , moisture stress , dry weight , cyperus , moisture , weed , biology , horticulture , field capacity , botany , chemistry , irrigation , geotechnical engineering , organic chemistry , engineering
Summary: Established Greenhouse grown plants of cogongrass Imperata cylindrica (L) Beauv.) and purple nutsedge ( Cyperus rotundus L.) were given three different soil moisture regimes; field capacity, moderate stress and extreme stress, followed 6 weeks later by glyphosate [(N‐phosphonomeihyl) glydne] applications to the shoots at 0.2,0.4 and 0.8 kg/ha for Imperata and 0.3,0.6 and 1.12 kg/ha for Cyperus. Field capacity watering stimulated most vegetative growth in hoth species. Glyphosate given at field capacity decreased shoot dry weight in both species, and rhizome length, rhizome dry weight and total carbohydrate in Imperata and total number of tuber‐bulbs in Cyperus . In contrast. at extreme soil moisture stress, glyphosate showed reduced activity which appeared to be related to the physiological and morphological behaviour of the plants arising from the drought trealment. Application of waier to the roots of the plants grown at soil moisture stress. I week before and I week afler glypbosate spraying, enhanced glyphosate activity, probably because of the recovery of processes disturbed by ibe soil moisture deficit.