Effect of Clay, Soil Organic Matter, and Soil pH on Initial and Residual Weed Control with Flumioxazin

Greenhouse studies were conducted to evaluate the effects of soil organic matter content and pH on initial residual weed control with flumioxazin by planting selected species in various lab-made field soils. Initial was determined seeds into soils treated (71 g ha−1). Seeds Echinochloa crus-galli (barnyard grass), Setaria faberi (giant foxtail), Amaranthus retroflexus (redroot pigweed), Abutilon theophrasti (velvetleaf) incorporated top 1.3 cm each at a density 100 per pot, respectively. Emerged plants counted removed both non-treated pots two weeks after following week for six weeks. Flumioxazin evaluated calculating percent emergence weeds compared Clay not found affect any tested species. Control A. theophrasti, E. crus-galli, S. reduced as increased. The affected matter. Soil below 6 but did crus-galli. 0, 2, 4, 6, 8 treatment. Eight treatment, gave 0% all tested. Chenopodium album (common lambsquarters) 100% duration experiment, except when greater than 3% or 7. only observed common C. (soil > 80%) above decreased Similar results comparing soils; however, differences between Results indicate that can provide ranging from 75–100%