Abstract
Field studies were conducted in 2000 and 2001 near Yoakum, Texas without irrigation to determine the effect of row spacing and herbicide dose on weed control and grain sorghum response. Atrazine or dimethenamid alone or in combination were compared under conventional row spacing (single rows spaced 91 cm apart on a bed) and twin rows (two rows spaced 20 cm apart on a single bed). Amaranthus albus (tumble pigweed) control was 100% with all treatments except dimethenamid at 0.56 kg/ha which controlled at least 96%. Panicum texanum (Texas panicum) control was less than 80% with dimethenamid at 0.56 kg/ha and atrazine at 0.56 and 1.12 kg/ha under the conventional row spacing. Under the twin-row system, P. texanum control was greater than 80% with all herbicides. Cyperus esculentus (yellow nutsedge) control was less than 70% early season with both row spacings but greater than 80% late season under the twin-row system.
Published Version
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