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Dimethyl sulfoxide, soil-incorporated at rates of 20 to 240 gpa, prevented the growth of roots and delayed and inhibited the growth of shoots of plants developing from purple nutsedge (Cyperus rotundus L.) tubers for a period of about two months. This effect upon growth occurred only while the tubers and developing plants remained in treated soil; transplanted to untreated soil, subsequent growth of roots and shoots was immediate and normal. The effective soil-residual life of dimethyl sulfoxide was about three months, irrespective of dosage. Dosages of 2 1/2 to 7 1/2 gpa had no effect upon the growth of the nutsedge plants. At 10 and 15 gpa, the inhibitory effect of dimethyl sulfoxide becomes apparent.
Weeds © 1966 Weed Science Society of America