1Ph. D. Scholar, Division of Agronomy, ICAR-Indian Agricultural Research Institute, New Delhi, 110 012
2Professor, Department of Agronomy
3Junior Research Officer, Department of Agronomy
4Senior Research Officer, Department of Agronomy
Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, 263 145
*Corresponding author's Email: ankit.tiwari2601@gmail.com
Online published on 4 August, 2018.
A field experiment was conducted during rainy season of 2015 at Pantnagar, Uttarakhand, to find out the critical period of crop-weed competition in aerobic rice (Oryza sativa L.). Yield losses due to crop-weed competition were most pronounced during the period from 15 to 45 days after sowing (DAS) and were ranged from 4.8% to 76%. Rice yield continued to decline as the duration of weed-competition increased beyond 15 DAS, as there was drastic reduction in the number of panicles/m2 and grains/panicle that accounted for lower rice yield. Hence the period between 15 and 45 days in aerobic rice under irrigated situation is crucial to achieve 95% of maximum possible yield (weed free) of aerobic rice.
Aerobic rice, Critical period of crop-weed competition, Weed density, Yield loss
