Competition from Vulpia myuros (L.) C.C. Gmelin in pastures, and its control by coating seeds with herbicides
1987
Scott, J.M. | Blair, G.J. (New England University, Armidale (Australia). Dept. of Agronomy and Soil Science)
The effect of a range of rat's tail fescue populations (up to 80,000 seeds per sq m) on the early growth of lucerne and phalaris was measured in a glasshouse experiment in soil amended with either high or low levels of nitrogen and phosphorus. Under both fertility regimes, competition from rat's tail fescue was severe at densities of 5000 seeds per sq. m and above with leaf number, plant height and DM yield of the sown species being markedly reduced in the presence of rat's tail fescue. In 2 further glasshouse experiments with lucerne, a wide range of seed-applied herbicides were evaluated at several rates to conrol germinating rat's tail fescue. EPTC significantly reduced weed density at rates as low as 0.35 kg per ha and was the only herbicide to significantly reduce the yield of rat's tail fescue (at rates as low as 0.1 kg per ha) and to allow an increase in the yield of the sown lucern. Confirmation of the effectiveness of seed-applied EPTC under direct-drill conditions is still needed.
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