Response of Asiatic dayflower (Commelina communis L.) to glyphosate and alternatives in soybean

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2007-01-01
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Ulloa Cortázar, Santiago
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Micheal D. K. Owen
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Agronomy

The Department of Agronomy seeks to teach the study of the farm-field, its crops, and its science and management. It originally consisted of three sub-departments to do this: Soils, Farm-Crops, and Agricultural Engineering (which became its own department in 1907). Today, the department teaches crop sciences and breeding, soil sciences, meteorology, agroecology, and biotechnology.

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The Department of Agronomy was formed in 1902. From 1917 to 1935 it was known as the Department of Farm Crops and Soils.

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1902–present

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  • Department of Farm Crops and Soils (1917–1935)

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Greenhouse experiments were conducted to evaluate Asiatic dayflower ( Commelina communis L.) tolerance to glyphosate. Glyphosate rates and growth stages of Asiatic dayflower were evaluated. Shikimate accumulation in Asiatic dayflower, glyphosate resistant (GR) and non-GR maize and soybean cultivars was estimated. Field research was conducted to evaluate herbicides for Asiatic dayflower control. Pre-emergent and post-emergent herbicides were applied. Under greenhouse conditions, a single application of glyphosate (0.84 kg ae ha-1) did not affect the growth of or shikimate accumulation in Asiatic dayflower. At an early growth stage (2 leaves), 3.36 kg ae ha -1 glyphosate provided 28% control. Susceptible maize and soybean and also Asiatic dayflower accumulated shikimate after glyphosate application. However, only Asiatic dayflower plants survived. In field experiments, metribuzin and KIH-485 provided ≥ 80% and 73% control of Asiatic dayflower respectively. Early POST applications of cloransulam-methyl and lactofen provided 80 and 67% control of Asiatic dayflower respectively.

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Mon Jan 01 00:00:00 UTC 2007