Abstract
Five triazine herbicides were evaluated for pre-emergence weed control in proso millet ( Panicum miliaecum L.) grown in the Central Great Plains of the United States. Atrazine and propazine maintained weed-free proso millet over the entire cropping season at rates of 0·28, 0·56, and 0·84 kg a.i./ha. Proso millet grain yields and water use efficiency were increased by these weed-control treatments. Metribuzin also effectively controlled weeds, but was phytotoxic to proso millet. Cyanazine and terbutryne at 1·12 kg/ha were not as effective as the other triazines in controlling the weed population. In a 5-year experiment, the elimination of weed competition by atrazine and propazine increased the harvest index by increasing the water use efficiency of the crop. Proso millet grown in dryland agriculture under weed-free conditions can more efficiently convert limited available water into harvestable grain.
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