Weed control for direct-seeded pea and lentil
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Field studies were conducted in 1995 and 1996 at two locations to investigate the efficacy of surface applied and shallow incorporated dinitroaniline herbicides in clay loam and sandy loam soils. Three rates of ethalfluralin (0.84, 1.1 and 1.4 kg a.i. ha-‘) and a single rate of triallate/trifluralin (10:4) (1.96 kg a.i. ha-‘), surface applied or shallow incorporated in the fall, were examined for weed control in direct seeded pea and lentil. Crop tolerance and weed control data were gathered to assess the suitability of these herbicides, in combination with a fall herbicide treatment with metribuzin or a spring bum-off treatment with glyphosate, for broad spectrum weed control. Seed yield in lentil and pea was not affected by reduced incorporation of the dinitroaniline herbicides in either year. Green foxtail (Setaria viridis L.) control was excellent and was not affected by weed density. In 1995, wild oat (Avena fatua L.) control was acceptable using both types of application when weed pressures were low to moderate. Wild oat control decreased as weed pressure increased, especially for surface applied treatments. Kochia (Kochia scopuriu L.) was present at the clay loam site in 1996 and control was not acceptable when ethalfluralin was surface applied or shallow incorporated. Wild buckwheat (Polygonum convolvulus L.), was present in 1996 at both sites but control was acceptable only at the clay loam site. A spring bum-off treatment with glyphosate in combination with a post-emergent application of metribuzin in lentil and MCPA-Na salt in pea provided better control of broadleaf weeds than a fall applied metribuzin treatment.
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