Effects of imazethapyr treated oil palm frond residue mulch
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https://doi.org/10.5958/0974-0112.2019.00021.5Keywords:
imazethapyr, oil palm frond residue mulch, weed control, ornamental plant.Issue
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Copyright (c) 2019 Indian J. Hortic.

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Abstract
A combination of oil palm frond (OPF) mulch and imazethapyr has been shown to provide good weed control
in crop plantations, but information on its potential use for weed control in nurseries is limited. This study
aims to evaluate the effect of imazethapyr in combination with OPF mulch on the inhibition of goosegrass,
slender cyperus, coat buttons and phytotoxicty on ornamental plants under glasshouse conditions. Three
suboptimal rates of imazethapyr, representing low, medium and high rates, are applied alone or used to treat
3.5 t ha−1 OPF residue powder (< 2mm). The low rate of imazethapyr at 10 g a.i. ha−1 and the OPF mulch alone
inhibit seedling growth of goosegrass, slender cyperus and coat buttons by 40%–60%. The OPF mulch treated
with imazethapyr at this rate acts synergistically and provides 80%–95% inhibition ofweed growth. However,
increasing the rate of imazethapyr over 10 g a.i. ha−1 does not further improve weed inhibition, and results in
antagonism on goosegrass and slender cyperus emergence. A subsequent experiment with the low rate of
imazethapyr incorporated with OPF mulch causes moderate phytotoxicity on Chinese aloe and coral swirl,
but minimal or no injury was observed for jasmine, cactus, puding and euodia at 4–12 weeks after treatment.
Results suggest that incorporation of imazethapyr at 10 g a.i. ha−1 with OPF mulch can effectively control
goosegrass, slender cyperus and coat buttons without injuring j asmine, cactus, puding and euodia.
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