Earl Vories, USDA-ARS, Delta Center, 147 St. Hwy T, P.O. Box 160, Portageville, MO 63873, Tina Gray Teague, University of Arkansas Agricultual Experiment Station - Arkansas State University, PO Box 2340, State University, AR 72467, Jeremy Greene, University of Arkansas, P.O. Box 3508, UAM Campus, Agriculture Building, Monticello, AR 71656, Jason Stewart, Arkansas State University, PO Box 1570, State University, AR 72467, Ernest L. Clawson, LSU AgCenter, P.O. Box 438, St. Joseph, LA 71366, Horace Pringle, Mississippi State University, Delta Research and Extension Center, Stoneville, MS 38776, and Bobby Phipps, University of Missouri, P.O. Box 160, Portageville, MO 63873.
US Cotton growers are adopting COTMAN, a COTton MANagement system developed at the University of Arkansas and used to monitor crop development and aid in making end-of-season decisions. Currently, research-based decision guides have been developed to aid in identifying the last effective boll population and determining dates for safe termination of insect control and the application of defoliants based on physiological cutout, or NAWF=5. An area of cotton production that may benefit from COTMAN is the decision of when to stop irrigating the crop. The objective of this research was to investigate a crop-based recommendation for timing the final irrigation on cotton. Since 2000, irrigation studies have been conducted in five states (Missouri, Arkansas, Mississippi, Louisiana and Texas) to investigate the response to late-season irrigation. Irrigation treatments consisted of different irrigation termination times at each site, with the first termination treatment targeted for approximately NAWF=5. The Texas studies dealt with drip and LEPA irrigation and are reported elsewhere. This report looks at the mid-South studies attempts to draw conclusions for a regional recommendation regarding irrigation termination.
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Recorded presentation
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