Vol. 5, Issue 4 (2017)
New herbicide molecule combination for control of complex weed flora in transplanted rice (Oryza sativa L.)
Author(s): Negalur RB, Ananda N, Guruprasad GS and Narappa G
Abstract: Field experiment was conducted during kharif, 2015 and 2016 at Agricultural Research Station, Gangavathi, Koppal District, University of Agricultural sciences, Raichur, Karnataka to study the bio-efficacy of combination of herbicides against complex weed flora and their effect on growth and yield of transplanted rice. The soil was medium deep black clay with medium fertility. At 60 days after transplanting (DAT), among the different herbicide combinations, lower density of grasses, sedges, broad leaf weeds and total weeds (2.96, 3.81, 2.86 and 5.22 / m2, respectively), dry weed weight (2.20, 2.64, 1.90 and 3.80 g/ m2, respectively) and higher weed control efficiency (80.69%) was recorded with application of pyrazosulfuron-ethyl 10 % WP 20 g ai/ha at 3 DAT fb chlorimuron ethyl + metsulfuron methyl 20 WP 4 g ai/ha at 25 DAT. Significantly higher total dry matter (81.79 g/plant), number of tillers (481/m2), number of panicles (381 m2), grain yield (5.05 t/ha), straw yield (6.02 t/ha) and lower weed index (3.86) was observed with treatment comprising of pyrazosulfuron-ethyl 10 % WP 20 g ai/ha at 3 DAT fb chlorimuron ethyl + metsulfuron-methyl 20 WP 4 g ai/ha at 25 DAT as compared to weedy check which recorded the lowest paddy yield (3.26 t/ha) and higher weed index (38.36 %) but next to hand weeding twice at 25 and 45 DAT. Weedy check treatment noticed significantly highest uptake of total nutrients (98.67 kg/ha) by the weeds as compared to hand weeding twice at 25 and 45 DAT (11.57 kg/ha). Application of pyrazosulfuron-ethyl 10 % WP 20 g ai/ha at 3 DAT fb chlorimuron ethyl + metsulfuron-methyl 20 WP 4 g ai/ha at 25 DAT recorded highest gross returns (Rs. 105738), net returns (Rs. 67462) and benefit cost ratio (2.85) compared to all other treatments under study.
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How to cite this article:
Negalur RB, Ananda N, Guruprasad GS, Narappa G. New herbicide molecule combination for control of complex weed flora in transplanted rice (Oryza sativa L.). Int J Chem Stud 2017;5(4):1592-1597.
