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Effects of humidity and moisture stress on glyphosate control of Cyperus rotundus L. *
Author(s) -
CHASE RICHARD L.,
APPLEBY ARNOD P.
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.tb01533.x
Subject(s) - cyperus rotundus , glyphosate , shoot , moisture stress , horticulture , humidity , relative humidity , bulb , cyperus , moisture , biology , botany , agronomy , chemistry , organic chemistry , physics , thermodynamics
Summary: Glyphosate at 2 kg/ha was more effective in reducing regrowth of purple nutsedge ( Cyperus rotundus L.) scapes at 90% than at 50% relative humidity (r.h.), and more effective at −2 bars than at −11 bars of plant water potential. Regrowth of treated plants subjected to water potentials of −1 to −8 bars was reduced 54–60% while at −11 bars growth inhibition was only 34%. A time interval of as little as 8 h between application and excision was sufficient to give 47% reduction in regrowth at 90% r.h. None of the treated plants, except those clipped immediately after application, produced new shoots from the basal bulb, while all the untreated control plants produced one or more new shoots. Experiments using 14 C‐glyphosate substantiated these results. Three times more 14 C‐label was translocated into the underground parts of nutsedge at 90% than at 50% r.h. Twice as much translocated at −2 bars than at −11 bars of water potential.