Tolerance of four pasture legumes and a perennial ryegrass to pre-sowing applications of metsulfuron methyl on acid soil [herbicide]
1992
Mitchell, G.J. | Chinner, S.R. | Colman, P.V. (South Australian Dept. of Agriculture, Flaxley. Flaxley Research Centre)
On a podzolic soil of pH 5.4, metsulfuron methyl at rates up to 12 g per ha a.i. applied in November did not affect the germination or growth of 5 pasture cultivars sown the following May. The cultivars tested were subterranean clover (Trifolium subterraneum L.) cvv. Karridale and Trikkala, balansa clover (T. michelianum Savi var. balansae Boiss.) cv. Paradana, white clover (T. repens L.) cv. Haifa and perennial ryegrass (Lolium perenne L.) cv. Ellett. Consequently, metsulfuron may have a role on acid soils in providing effective control of some troublesome weeds on old pasture land in the year before resowing pastures. Although metsulfuron can be used for control of bracken (Pteridium esculentum (Forst. f.) Nakai) in summer-autumn, the registered rate of 36 g per ha a.i. applied in January to chemically fallowed pasture caused unacceptable reductions in the growth of all 5 cultivars sown in May. However, metsulfuron applied in January at 12 g per ha a.i., or in April at 6 g per ha a.i., was tolerated satisfactorily by May-sown perennial ryegrass.
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