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Chemical control of perennial nutsedge ( Cyperus rotundus L. ) in tropical upland rice
Author(s) -
OKAFOR L. I.,
DATTA S. K.
Publication year - 1976
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.1365-3180.1976.tb00368.x
Subject(s) - cyperus rotundus , perennial plant , agronomy , weed , cyperus , dry season , crop , mecoprop , wet season , biology , weed control , horticulture , mcpa , ecology
Summary: Five herbicides were tested in the dry and in the wet season for their effectiveness in conlrolling perennial nutsedge ( Cyperus rotundus L. ) in direct‐seeded upland rice in the tropics. K‐223 [N‐(α,α‐dimethylbenzyl)‐N'‐P‐tolyl urea] gave the best results. When broadcast sprayed at 8.0 kg a.i./ha in the dry season and 10 kg a.i./ha in the wet season and immediately mixed into the soit just before drilling, K‐223 gave excellent perennial nutsedge control with no visible crop damage and increased the grain yield. Bentazone at 2.0 kg a.i./ha applied 7 days after crop emergence was highly selective and gave fair control of nutsedge without being toxic to the crop. MBR 8251 [1.1,1‐trifluoro‐4′‐(phenylsulfonyl) methane‐sulfono‐o‐toluidide] at 2.0 kg a.i./ha, mecoprop (MCPP) at 1.5 kg a.c./ha and fenoprop (silvex) at 1.0 kg a.e./ha applied 7, 14 and 7 days, respectively after crop emergence provided a fair degree of nutsedge control. Fenoprop and MBR 8251 caused slight and mecoprop moderate initial toxicity, but the injury sustained did not significantly affect crop yield.