Simazine mixtures for control of annual grasses in pastures [Trifolium subterraneum]
1993
Leys, A.R. | Plater, B. (New South Wales Agriculture, Wagga Wagga (Australia). Agricultural Research Inst.)
The effectiveness of tank mixes of simazine plus paraquat, and simazine plus fluazifop-P, for control of annual grass weeds in subterranean clover (Trifolium subterraneum L.) pastures was compared in 6 field experiments in southern New South Wales between 1989 and 1991. Mixtures of simazine (500-750 g a.i. per ha) plus very low rates of paraquat (40-60 g a.i. per ha) gave better than 90 percent control of vulpia (Vulpia bromoides and V. myuros), barley grass (Hordeum leporinum), annual ryegrass (Lolium rigidum), and great brome (Bromus diandrus) and were at least as effective as mixtures of simazine plus fluazifop-P (53-106 g a.i. per ha). Subterranean clover plant density was not affected by any treatment. Excellent control of grasses caused increased subterranean clover dry matter yields at 1 site and no differences at another site. In weed-free conditions, 12 of 21 herbicide treatments damaged subterranean clover (severe leaf burn and retarded growth) and significantly reduced dry weight, but this was not reflected in subsequent seed yields.
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