Impact of Sowing Dates on the Growth and Yield of Rice (Oryza sativa L.) Varieties under Wet Seeded Condition in North-Eastern Ghats Zone of Odisha

An experiment was conducted to reveal the effect of sowing dates on rice varieties under wet seeded condition during Kharif at Post Graduate Research Farm, MSSSoA, CUTM. The experiment was designed in split plot design with three replications. Three sowing dates (11th July, 21st July and 31st July) and three rice varieties (Swarna, Naveen and RNR 15048) were taken as mainplot and subplot treatments, respectively. As per the results, 11th July sown crop performed significantly superior in terms of almost all the growth attributes such as tiller density at 90 DAS (238.11 m-2), LAI at 90 DAS (3.10) and DMA at harvest (1123.53 g m-2), yield attributes such as no. of panicles m-2 (216.78), no. of filled grains panicle-1 (115.33) and grain yield (4.67 t ha-1) as compared to other sowing dates. The grain yield of rice varieties was reduced @50.22 kg ha-1 day-1 due to the delayed sowing from 11th July – 21st July and @45.61 kg ha-1 day-1 till the end of July. In the other hand, the rice variety, Naveen provided significantly higher results of almost all growth attributes such as plant height at harvest (104.0 cm), yield attributes and grain yield (4.71 t ha-1). GDD, PTU and HTU showed significant positive correlation with grain yield at 50% flowering to harvest for the variety, Swarna and RNR 15048 whereas, significant negative correlation was obtained at sowing to PI for the variety, Naveen. In conclusion, the rice variety, Naveen sown on 11th July performed superior in respect to growth and yield attributes and yield with optimum duration of phenophases and provided higher economic returns.