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A replicated trial to itudy the effect of herbicides on tuberization of Cyperus rotundus L. was conducted at Agricultural College, Jobner, from October, 1975 to January, 1976. One month old seedlings of Cyperus established without tubers in pot culture were treated with post-emergence sprays of 5,000 ppm (0.5% solution) each of MSMA, nitrofen and cacodylic acid and the combinations of cacodylic acid -f MSMA, nitrofen + MSMA, and nitrofen + cacodylic acid, and control (spraying with plain water). Each component of the combinations had the concentration of 5000 ppm. These treatments were replicated four times in a randomised block design. Plant characters were noted periodically and the tuberization was recorded 90 days after the application of the treatments.
All the herbicides, whether used singly or in combinations, adversely affected the treated plants which were either completely killed or partially retarded tuberization. The synergistic effect of nitrofen and MSMA was most prominent in rapidly killing the plants and in reducing significantly the number and weight of tubers.
