Tuesday, 8 November 2005
147-8

This presentation is part of: Agricultural Systems: Weeds, Planting Dates, and Plant Densities

Comparison of Single- and Twin-Row Planting Patterns in Cotton Production.

Daniel O. Stephenson IV and Barry J. Brecke.

Experiments were conducted in 2004 and 2005 at the West Florida Research and Education Center near Jay, FL to determine the feasibility of twin-row cotton production. Deltapine 555 Bollguard/Roundup Ready was planted in a twin-row (19 cm apart) and single-row planting pattern spaced 76 cm apart with a final plant populations of 1, 2, and 4 plants foot-1. Three herbicide application timings (1, 2, and 3 applications) were investigated with the following treatments: 1) glyphosate (1 kg ha-1) plus S-metolachlor (1.12 kg ha-1) postemergence over-the-top (POT) to 4-leaf cotton; 2) 4-leaf POT followed by glyphosate (1 kg ha-1) early postemergence-directed (EPDS) to 6 to 8-leaf cotton; 3) 4-leaf POT followed by 6 to 8-leaf EPDS followed by MSMA (2.24 kg ha-1) plus prometryn (1.34 kg ha-1) late postemergence-directed (LPDS). Visual weed control ratings recorded 20 weeks after planting (WAP), photosynthetically active radiation (PAR) 8 and 10 WAP, date of canopy closure, and seed cotton yield are presented. Data indicates that at least two herbicide applications are needed for greater than 90% control of sicklepod, yellow nutsedge, smallflower morningglory, and tropical spiderwort regardless of planting pattern and plant population. Furthermore, twin-row planting pattern captured more PAR than single-row cotton 8 WAP, however this advantage was overcome 10 WAP by increased plant populations. No differences in seed cotton yield was observed between twin and single-row cotton planting pattern, indicating that cotton can be planted in twin-rows without a detrimental effect on yield.

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