Indian Institute of Sugarcane Research, Lucknow-226 002 (U. P.), India.
Field experiments carried out to study the bio-efficacy of sulfentrazone for weed control in sugarcane in general and control of Cyperus rotundus in particular revealed that pre-emergence tank-mix application of sulfentrazone 0.5 kg+atrazine 2.0 kg ha−1 or sulfentrazone 1.0 kg+atrazine 2.0 kg/ha brought about highest magnitude of weed control upto 120 days after planting (DAP), and was statistically at par with manual hoeings. These treatments resulted into the significantly highest number of millable canes (105.5 and 117.7 '000 ha−1) and cane yield (80.7 and 86.2 t ha−1). It was significant to note that performance of these treatments was superior to that of three hoeings. Application of sulfentrazone and atrazine as a tank mix provided excellent control of C. rotundus and the plot remained free of C. rotundus upto 120 DAP. There was no conspicuous effect of various treatments on juice quality in both the experiments.
