Project Summaries

05-604FL  Project Manager: E. M. Barnes


Barry J. Brecke, University of Florida

This study was conducted to determine whether cotton seeding rates can be reduced by planting in twin-rows (two rows spaced 8 inches apart with sets of twin rows spaced 30 inches apart compared to conventional pattern of single rows spaced 30 inches apart) while maintaining or increasing yield and to determine whether twin-row cotton planting can improve competition with weeds and reduce herbicide inputs while maintaining or increasing cotton yield. Roundup Ready cotton (Deltapine 555 BG/RR) was planted May 26, 2005 in both single and twin rows. In both row patterns cotton densities of 1, 2, or 4 plants per foot of cotton row were established. Weed management programs ranged from minimal to extensive herbicide input. 

The cotton canopy of the twin-row cotton closed (completely shading the area between the cotton rows) 2 weeks prior to cotton growing in single rows. Less light reached the soil surface in the twin row cotton which reduced the light available to weeds thus reducing the amount of weed growth in the twin-row compared to single row cotton. Less herbicide was required to achieve good weed control in the twin-row cotton than in the single row cotton because the twin-row cotton was better able to compete with weeds. Cotton plant density also had an effect on light penetration with nearly twice the light reaching the soil surface when cotton density was 1 pant per foot of row compared to a density of 4 pants per foot of row. A combination of twin-row cotton at a high cotton density reduced weed growth by at least 10%. Cotton yield was also better in the twin-row pattern. Yield of cotton in twin rows was up to 25% better than in the single rows. The twin-row planting pattern allows the canopy to close sooner, reduces weed competition and results in higher yields than single row cotton.


Project Year: 2005

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