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AbstractSix field trials were conducted between 1994 and 1996 in Buckeye and Gila Bend, Arizona to determine the effect of soil fumigation with Telone II on the yield of cotton following rotation with Durham wheat. Telone was shank injected at two or more rates (0, 3, or 5 gal/acre) in fields previously maintained with a cotton-wheat-summer/winter fallow rotation. Five fields were planted to Upland and one field to Pima cotton. Four of the six trials resulted in an average lint yield increase of 180 lint lbs/ac compared to the untreated controls. In one trial where all three rates were compared, yield at the 5 gallon rate was increased 141 lint lbs/ac compared to the 3 gallon rate and the control. In two of the trials none of the treatments differed significantly.