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SELECTIVE HERBICIDAL CONTROL OF BARLEY GRASS IN PASTURE AND LUCERNE |
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| Authors: | E G CUTHBERTSON |
| Institution: | Wagga Agricultural Research Institute, Wagga Wagga, New South Wales, Australia |
| Abstract: | Summary. Comparative experimental results with dalapon-sodium and paraquat for the control of barley grass ( Hordeum leporinum Link) in lucene and subterranean clover pasture are reported. Sprays were applied 3–4 days after a simulated grazing. At all rates tested (1–4 lb/ac), dalapon provided satisfactory control of, but did not eradicate, barley grass. Subterranean clover productivity was reduced substantially whether application was in May or July; lucerne growth was retarded by 4 lb/ac applied in July. Paraquat applied at 0.06–0.25 lb/ac in May gave similar but somewhat less effective control than did dalapon. Some re-establishment of barley grass occurred as a result of late germinations following the May applications. Paraquat applied in July at 0.06 lb/ac gave unsatisfactory results, but at 0.12 and 0.25 lb/ac the control was comparable with that given by dalapon. Subterranean clover was damaged slightly by the May treatments but recovered quickly, after initial scorching, following applications in July. Lucerne was neither damaged nor retarded by paraquat. The addition ofa wetting agent increased the efficacy of paraquat in controlling certain more tolerant annual grasses, but not barley grass. Désherbage sélectif des pâtures ft des luzernes: lutte contre l'orge des lièvres |
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