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Effects of terminating cover crops with rolling/crimping and herbicides in a cotton no-till system

Ted S. Kornecki, Andrew J. Price, Kipling Balkcom
Hungarian agricultural engineering 2013 v.25 no.15 pp. 59-63
Trifolium incarnatum, acidity, application rate, autumn, cotton, cover crops, crop yield, field experimentation, glyphosate, growing season, nitrogen, no-tillage, nozzles, plant residues, rolling, rye, summer, vegetative growth, vinegars, Alabama
In fall of 2008, a field experiment was initiated in central Alabama to study the effects of rolling/crimping and different herbicides with different application rates on cover crops termination rates, cotton population and yield. Results from 2009 and 2010 growing seasons are presented. A roller/crimper only and with supplemental use of two organic herbicides (Weed-Zap and vinegar 20% acidity) and glyphosate were applied as a continuous spray, every other crimp and every third crimp controlled by a high speed solenoid valve nozzle system to terminate cereal rye and crimson clover. In 2009, three weeks after rolling, termination rates due to rolling/crimping and herbicide treatments for cereal rye were between 96-100%, whereas for crimson clover were lower (75.3–82.4%) because of moisture excess. Three weeks after rolling, in 2010, termination rates for cereal rye were 96.4 to100%, and between 93.1 to 100% for crimson clover. In 2009, rolling treatments and cover crop type had no effect on cotton population which averaged 45,830 plants ha-1. Contrary, in 2010 cotton population due to rye was lower: 27291 plants ha-1 compared to 47411 plants ha-1 due to clover. In 2009, significantly higher average seed cotton yield was 3494 kg ha-1 for cereal rye compared to 2853 kg ha-1 for crimson clover. In 2010 cotton yield was affected by very dry and hot summer. Average yield for rye was 1793 kg ha-1, whereas for crimson clover the seed cotton yield was 1638 kg ha-1. Lower cotton yield with crimson clover was associated with a higher vegetative plant growth due to Nitrogen release from crimson clover residue.