INFLUENCE OF SOWING DATES AND PLANTING METHODS ON WEED DYNAMICS IN WHEAT CROP

Different sowing dates and planting methods of wheat has a varying impact on the associated weeds. An experiment was conducted to explore the influence of different sowing dates (raised bed planting, drill sowing and broadcasting) and planting methods (November 15, November 30, December 15) in wheat and its associated weeds during 2008-09 and 2009-10. Wheat planted on raised beds had the minimum weed infestation. Similarly among the various sowing dates, wheat planted on December 15 observed minimum weed density and biomass recorded at all the harvesting intervals i.e. 40, 60 and 80 days after sowing. Chenopodium album and Phalaris minor were the dominant weed species of the experimental field. Weed dynamics was observed maximum at November 15 because likewise wheat, environmental conditions at this time were also most suitable for the associated weeds to germinate. Maximum grain yield, productive tillers, grains per spike and thousand grain weight was recorded, where wheat was planted on raised beds on November 15 during both the years of experimentation. In conclusion, for getting maximum marginal rate of return wheat should be planted at November 15 on raised beds.