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Abstract
Effects of Herbicides on Seed Germination and Control of
Pennisetum Polystachion(L.) Schult
Studies were carried out in Petri dishes to identify
herbicides which could eventallly inhibit seed germination of Pennisetum
polystachion (L.) Schult. Amongst the pre-emergence herbicides, ametryn was the
most effective compared with alachlor, metolachlor, oxyfluorfen, imazethapyr
and diuron while amongst the contact herbicides, paraquat and glufosinate
ammonium were more effective than monosodium methanearsonate (MSMA) and sodium
chlorate. Amongst the post-emergence herbicides, imazapyr was more effective
than glyhosate isopropylamine and glyphosate trimesium while triclopyr was more
effective than 2, 4-D dimethylamine, bentazone, fluroxypyr, metsulfuron methyl
and dicamba. In field trials, minimum effective rates for the kill of P.
polystachion were 1.44 kg ae/ja for glyphosate isoproplamine, 1.08 kg ae/ha for
glyphosate trimesium, 0.5 kg ae/ha for imazapyr and 2.0 kg ai/ha for MSMA.
Glufosinate ammonium was almost as effective as pre-mixed glyphosate
isopropylamine + ammonium suphate in killing the weed and these herbicides were
more effective than paraquat, pre-mixed paraquat + diuron and slashing.

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