Vol. 10, Issue 1 (2021)

Author(s):
AK Padhairy, BR Nayak, D Panda and A Alim

Abstract:
The field experiment was conducted at the Regional Research Technology and Transfer Station (RRTTS), Chiplima, Sambalpur, Odisha during summer season of 2019 & 2020 to see performance of medium duration rice varieties with varying irrigation regimes under aerobic condition. The experiment was laid out in split plot design with 3 replications and consisted of four irrigation regimes (I₁ = Irrigation at IW/CPE = 1.0, I₂ = Irrigation at IW/CPE = 1.5, I₃ = Irrigation at IW/CPE = 2.0, and I₄ = Irrigation at IW/CPE = 2.5) in main plot treatments and four varieties (V₁ = Naveen, V₂ = MTU-1010, V₃ = CR Dhan-201 and V₄ = CR Dhan-204 in subplot treatments. The result of pooled mean of both the years showed that highest grain yield was recorded at IW/CPE = 2.5 i.e 4.07 t/ha, which was at par with IW/CPE = 2.0 (3.90 t/ha) and significantly superior to rest of other irrigation regimes. But in case of cultivars, highest grain yield was obtained with variety CR-Dhan 201(3.54 t/ha) which was at par with variety Naveen (3.30 t/ha) and significantly superior to rest of other cultivars. The highest mean FWUE of 40.71kg/ ha-cm was observed with irrigation at IW/CPE 1.5 which was at par with other irrigation regimes except IW/CPE 2.5 whereas, highest B: C ratio (1.74) was observed with irrigation at IW/CPE 2.0 which was at par with IW/CPE 2.5 (1.73) and significantly superior to other irrigation regimes. But in case of cultivars, highest mean FWUE of 41.60 kg/ ha-cm and B: C ratio (1.62) were observed with variety CR Dhan 201 and significantly superior to rest of other cultivars. Hence, it may be concluded that variety like CR Dhan 201 needs to be irrigated at IW/CPE 2.0 produced economically optimum yield and field water use efficiency on sandy loam soils of western region of Odisha under aerobic condition.