اثر تاريخ هاي مختلف بذرپاشي بر رشد و عملكرد ارقام برنج در كشت مستقيم

Effect of Different Sowing Dates on Growth and Grain Yield of Rice under Direct Seeded Condition

The effect of seeding dates were evaluated on growth and yield of rice under direct seeding in a split plot experiment based on RCBD during growing season of 2007.Four seeding dates were April 30 and May 10 , 20 and 30 using three cultivars (Hashemi, Tarom and Elpaso) with four replications. Seeding dates and cultivars were assigned to main and sub plots, respectively. The results showed that date of seeding did not have any significant effect on the number of panicle per m while the effect of date of seeding on seed yield, number of non-bearing tillers per m2 , length of panicle, number of full and empty fruits per square meter and plant height were significant. Second date of seeding produced 5029 Kg per hectares with plant height of 111 cm, Elpaso produced 5378 Kg per hectare, the highest seed yield, Hashemi with height equal to 117 cm had the highest plant height. Date of seeding by cultivar interaction for number of non-bearing tillers, number of panicles per m2, length of panicles, number of full and empty seeds were significant. Elpaso, on second seeding date, produced highest full seed per m2 (19270), number of panicle per m2 (322), and highest yield (6854 Kg per hectare).