Weeds in grain-lupins. 2. The response of narrow-leafed lupins to pre-emergence herbicides

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Abstract
Results are reported from 18 experiments in which pre-emergence herbicides were evaluated in narrow-leafed lupins, (Lupinus angustifolius). At all 11 sites south of Perth [Australia] (latitudes 32.degree. S-35.degree. S) there was a significant lupin grain yield response to herbicides (P < 0.05). There was a significant yield increase at only 1 of the 7 sites north of Perth (latitudes 28.degree. S-32.degree. S). Significant yield increases were obtained on at least 1 occasion with alachlor 1.1, 2.2 kg a.i. [active ingredient] ha-1; diuron 0.4, 0.8, 1.3 kg a.i. ha-1; linuron 1.1, 2.2 kg a.i. ha-1; simazine 1.1, 1.7, 2.4 kg a.i. ha-1 and trifluralin 0.5, 1.1 kg a.i. ha-1 (P < 0.05). Diuron 0.8 kg a.i. ha-1; linuron 2.2 kg a.i. ha-1 and simazine 1.1, 1.7 kg a.i. ha-1 each resulted in a significant lupin yield reduction on 1 occasion (P < 0.05).

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