PROSE MILLET (PANICUM-MILIACEUM) RESPONSE TO CGA-152005, METSULFURON,AND TRIASULFURON

Prose millet is a short-season summer annual grass that is well adapte d to the central Great Plains. Prose miller is commonly planted as a s ummer crop when winter wheat stands are lost due to adverse conditions , Sulfonylurea herbicides labeled for use in winter wheat prohibit pla nting prose millet for intervals up to 10 mo following application, A series of greenhouse and field studies determined prose millet toleran ce to CGA-152005, metsulfuron, and triasulfuron soil residue. In the g reenhouse, prose millet was not affected by soil-applied CGA-152005 at doses up to 160 g ai/ha, while metsulfuron and triasulfuron doses of 4 and 15 g ai/ha, respectively, inhibited prose millet biomass accumul ation. in the field, metsulfuron and triasulfuron caused early season stunting and chlorosis at doses two to four times those recommended; h owever, grain yields were not affected. Organic matter and clay conten t were highly correlated with prose millet growth response to the herb icides under greenhouse conditions, but in the field, soil pH may have influenced herbicide bioavailability.