The effect of soil ph on the activity of oryzalin and metribuzin on five common weeds in no‐till crop production

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Abstract
Metribuzin [4-amino-6-tert-butyl-3-(methylthio)-as-triazine-5(4H)-one] and oryzalin (3,5-dinitro-N4, N4-dipropylsufanilamide) at 2 rates each were applied to pots of Cecil sandy loam soil adjusted to pH levels of 5.8, 6.2, 6.8 and 7.2 containing 5 weed species. Redroot pigweed (Amaranthus retroflexus L.) and large crabgrass [Digitaria sanguinalis (L.) Scop.] were completely controlled by both herbicides at all rates and all pH levels. Siclkepod (Cassia obtusifolia L.) was controlled by metribuzin, but not completely by oryzalin. Jinsonweed (Datura stramonium L.) and tall morningglory [Ipomoea purpurea (L.) Roth] were not controlled by either herbicide. Soil pH had no effect on jimsonweed control with either herbicide. Morningglory was best controlled by both herbidies at higher soil pH.