Conventional ginning practices recommend that Pima cotton be roller ginned and Upland cotton be saw ginned. Occasionally, there is interest in roller ginning some of the longer staple length upland cottons (Gerdes et al., 1943), (Chapman et al., 1965), Hughs et al., 1986). In the Mesilla Valley of New Mexico, a small amount of Acala 1517 is roller ginned to fill specific contracts. Until recently, there has been very little demand for roller-ginned upland cotton. The February 6, 1989, issue of "Update" (published by Calcot) discusses current interest in roller-ginned Prema C-32 which is an upland cotton. Currently, several roller gins are being built in the San Joaquin Valley to process the expected Pima acreage as well as the potential demand for roller-ginned upland such as Prema C-32. Because of the type of process, it is more expensive to roller gin a bale of cotton than it is to saw gin that same bale. To justify roller ginning upland cotton, the producer must receive a premium for that roller ginned upland that at least covers his increased costs. To justify paying the premium price, the cotton buyer must be convinced of improved fiber quality effects from roller-ginned upland cotton.