Effects of glufosinate-ammonium and terbuthylazine on germination and growth of two weed species [Asystasia gangetica; Paspalum conjugatum]
1994
Sahid, I. | Kalithasan, K. (Kebangsaan Malaysia Univ., Bangi. Dept. of Botany)
Effects of glufosinate-ammonium and terbuthylazine on germination and growth of 2 weed species were evaluated in the laboratory and in the greenhouse. Germination of Asystasia gangetica (L.) T. Anders and Paspalum conjugatum Berg. declined considerably when seeds were germinated in petri dishes containing either glufosinate-ammonium or terbuthylazine at 250 m per L. Glufosinate-ammonium also caused a marked reduction in radicle elongation of Asystasia, whose fresh weight was reduced proportionately with increasing concentrations of either glufosinate-ammonium or terbuthylazine. Terbuthylazine was more effective than glufosinate-ammonium in reducing germination and growth of both weeds when applied either to seeds on the soil surface or to the soil prior to sowing. Storage of seeds after treatment with either herbicide reduced the inhibitory effect of the herbicide on germination and growth of the weeds. Residual terbuthylazine in soil 14 days after treatment could still reduce germination and growth of the weeds.
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