Abstract
Rainfed Aus rice is a popular conventional rice cultivation technique that through appropriate variety selection can accelerate the benefits of the farmer. On this context, an experiment was carried out at the research field of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur1706 from April to August in 2014 to evaluate yield performance of some Aus rice varieties under rainfed condition. The experiment was laid out in a split plot design with three replications. The experiment consisted of two sets of treatments: water regime as irrigated (irrigation when necessary) and rainfed (dependent on rainfall) in the main plot and 15 varieties into sub-plots. It was revealed that yield and yield contributing characters were significantly influenced by water regime, variety and their interaction. The traits like number of effective tillers and non-effective tillers·hill-1, number of filled grains and unfilled grains panicle-1, panicle length, test weight, grain yield and harvest index were higher in irrigated crops compared to rainfed. Considering the performance of yield, the highest grain yield recorded in BRRI dhan27 (irrigated-2.47 t·ha-1 and rainfed-2.26 t·ha-1) followed by BRRI dhan55 (irrigated-1.95 t·ha-1 and rainfed-1.88 t·ha-1), BRRI dhan48 and BRRI dhan43 under both irrigated and rainfed treatment. BRRI dhan27 ranked the top under both irrigated and rainfed conditions, however the relative yield was maximum in BRRI dhan55 (reduction was only 3.59%) followed by Nerica10. Hence, considering the yield stability and absolute yield performance, BRRI dhan27 may be considered favorably cultivable for Aus season in Bangladesh followed by BRRI dhan55, BRRI dhan48 and BRRI dhan43.
Highlights
Rice (Oryza sativa L.) is the staple food in Bangladesh and for more than three billion people globally [1]
Bangladesh Rice Research Institute (BRRI) dhan27 ranked the top under both irrigated and rainfed conditions, the relative yield was maximum in BRRI dhan55 followed by Nerica10
The maximum number of effective tillers·hill−1 (25.32 and 22.33) was found in BRRI dhan27 which was statistically different from others and the minimum was (9.14 and 6.54) noticed in Nerica1 which was statistically akin to Nerica10 under both irrigated and rainfed treatment respectively
Summary
Rice (Oryza sativa L.) is the staple food in Bangladesh and for more than three billion people globally [1] To feed this huge number of consumers, it needs to cultivate rice at a large scale of area and at a very higher production rate. Highest loss in this practice befalls due to drought, for its high requirement of water, causing damage to 2.32 million hectares crop per annum [5]. These water stress vulnerability scenarios are likely to be worsen in the future with predicted climate change scenarios, which will lead to more complex interactions of water stress with other abiotic and biotic stresses. It is necessary to find out Aus rice genotypes which exhibit the desired characters like short duration, high yield potential and tolerant towards water stress, so that they can be taken for mass scale production
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