V Rajendra Prasath
Ph.D. Scholar in Agronomy,
MV Sriramachandrasekharan
Professor of Soil Science and Agricultural Chemistry
Faculty of Agriculture, Annamalai University, Annamalainagar, Tamil Nadu, India
rajeear101@gmail.com
Abstract
: A field experiment was conducted to manage the weeds by pre and post emergence herbicide combinations in transplanted rice during February-May 2020 at the Experimental Farm, Department of Agronomy, Annamalai University, Tamil Nadu, India. Treatments comprised of pre-emergence herbicides (butachlor, pretilachor and pyrazosulfuron ethyl) and post emergence herbicides (bispyribac sodium, metsulfuron methyl + chlorimuron ethyl, fenoxaprop-p-ethyl and triafamone + ethoxysulfuron), hand weeding twice (20 and 40 DAT) and unweeded control plot. Among the weed management practices hand weeding twice at 20 and 40 days after transplanting (DAT) notably reduced the weed counts, increased crop resistance, higher growth and yield attributes and grain yields. It was statistically on par with application of pyrazosulfuron ethyl 20 g ha-1 PE at 3 DAT followed by bispyribac sodium 25 g ha-1 PoE at 20 DAT. Best it was superior to hand weeding twice interms of net income (₹48,997) and BCR (2.06). The results suggested that application of pyrazosulfuron ethyl 20 g ha-1 PE at 3 DAT followed by bispyribac sodium 25 g ha-1 PoE at 20 DAT were the best broad spectrum effective herbicides in order to manage the diverse weed flora in transplanted rice.
Keywords:
:Economics, Herbicides, Transplanted rice and Weed management.
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