Tolerance of seedling forage legumes to herbicides
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Seeding alfalfa, red clover, and sweet clover showed tolerance to 1.1-2.2 kg ha-1 of trifluralin, ethalfluralin, EL 5261 (trifluralin + ethalfluralin at 1:1), and 3.3-6.6 kg ha-1 of EPTC applied pre-plant incorporated to Melfort silty clay loam in 1983. In a second experiment established in 1984, these treatments caused slight stunting of the legumes in the early stages of growth, but there was no stand thinning and the stunting effect had disappeared by August. All rates of these treatments provided satisfactory control of green foxtail, wild oats and seedling bromegrass. Control of volunteer wheat was satisfactory at the higher rates and that of barley was satisfactory only with the higher rates of ethalfluralin and EPTC. Alfalfa dry matter yield obtained in the following year was not affected by pre-plant incorporated treatments. Red clover yield-increased with applications of trifluralin and EL 5261 at 2. 2 kg ha-1. Sweet clover yields increased 34 to 104 % of the check with applications of ethalfluralin at 2 kg ha-1, EL 5261 at 2.2 kg ha-1, trifluralin + triallate at 0.84 + 1.4 kg ha-1 and EPTC at 6.6 kg ha-1. Post-emergence applications of sethoxydim up to 0.8 kg ha-1 were safe on all the three seedling legumes. Propanil, tank-mixed application of sethoxydlin + 2,4-DB and split application of sethoxydim + bentazon injured the legumes in the establishment year, however, recovery was complete in the following year and alfalfa yields were increased by 32 % with applications of sethoxydim + 2,4-DB and sethoxydim + bentazon. Complete control of annual broadleaf and grass weeds were achieved with propanil at 2 kg ha-1 and sethoxydim + bentazon at 0.35 + 1.08 kg ha-1.
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