Mepiquat chloride (MC) based products have been around for many years. One of the newest MC products is Dupont's Mepex Gin Out(4.2% a.i./gallon or 0.35 lb/gallon a.i. with 0.0025% kinetin (cytokinin). Cytokinins are plant hormones that promote cell division and growth and delay the senescence of leaves. If senescence is delayed, an application at cutout(NAWF=5) could increase photosynthetic activity and the subsequent assimilation of carbon.

This study consisted of five treatments which included mepex, pentia, mepex gin out, mepex gin out + an additional cutout application, and an untreated check. All treatments with the exception of the untreated check, received applications during the squaring and flowering stages of development as needed. For the mepex gin out + cutout treatment, an additional application was applied at cutout(NAWF=5). To determine if there was any benefit from the cutout application, lint yield, turnout, fiber quality, and late season vegetative growth were measured and statistically analyzed.