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Development of Drought Tolerant Rice Variety BRRI Dhan66 for Rainfed Lowland Ecosystem of Bangladesh

M A Kader*
Plant Breeding Division, BRRI, Gazipur, Bangladesh.

T L Aditya
Director (Research), BRRI, Gazipur, Bangladesh

R R Majumder
Plant Breeding Division, BRRI, Gazipur, Bangladesh.

T K Hore
Plant Breeding Division, BRRI, Gazipur, Bangladesh.

A K M Shalahuddin
Plant Breeding Division, BRRI, Gazipur, Bangladesh.

A Amin
Plant Breeding Division, BRRI, Gazipur, Bangladesh.

Abstract/ Executive Summary:

A newly released drought-tolerant rice variety BRRI dhan66suitable for rainfed lowland ecosystem of Bangladesh is an improvement over existing drought-tolerant rice varieties. The variety has satisfactorily been passed in the proposed variety trial conducted in the farmers’ field. As a result, National Seed Board (NSB) approved this variety for commercial cultivation in the wet season (T. Aman) in 2014. It has a modern plant type with 120 cm plant height and matures in 110-115 days. The important feature of this variety is higher drought tolerance during the reproductive stage. It can produce 4.5-5.0 t/ha grain yield without irrigation during the reproductive stage. It can produce a satisfactory yield when soil moisture remains <20% and perch water table depth is more than 70-80 cm from the surface. The seed size of the variety is 24 g with the intermediate long bold grain. It has a long, wide and erect flag leaf with deep green color. It is highly promising as a drought-tolerant rice variety for cultivation in the drought-prone area, which helps farmers’ to get rid of huge economic loss and is contributing to sustaining food security.

Keywords: Drought, Wet season, BRRI dhan66, Reproductive stage, Perch water table, Soil moisture

Location:

Start Date:

End Date:

Program Area: Risk Management in Agriculture

Commodity: Rice

Objectives:

To release IR82635-B-B-75-2 as a drought-tolerant variety BRRI dhan66, the yield and other parameters were observed which has been discussed very intensively in this study.

Methodology:

BRRI dhan66 is an outcome of a single cross between two advanced breeding lines IR78875-176-B-2 and IR78875-207-B-3 with a hope to develop a drought-tolerant rice variety in International Rice Research Institute (IRRI). The pedigree of BRRI dhan66 is IR82635-B-B-75-2. The fixed-line was introduced from IRRI in 2010 and advanced yield trials were conducted in the different drought-prone areas of Bangladesh until 2013. The promising line was subjected to an advanced yield trial (AYT) to evaluate specific and general adaptability with standard check BRRI dhan56 in the on-station condition of nine regional stations of BRRI in randomized complete block (RCB) design with three replications in T. Aman 2011. After proper yield evaluation, this material was subjected to advanced lines adaptive research trial (ALART) to evaluate specific and general adaptability with standard check BRRI dhan56 in the farmers’ field condition in T. Aman 2012 conducted by Adaptive Research Division (ARD) of BRRI. This genotype was tested for different physico-chemical properties, cooking qualities and best planting time, disease-insect reactions under natural conditions were found out. Plant height, tillering ability were recorded from the ten random plants excluding border rows. Growth duration was counted from seedling to 80% grain maturity. Grain yield data was taken from 10 sqm sample plot in each replication. In T. Aman 2013, IR82635-B-B-75-2 (BRRI dhan66) was evaluated by the National Seed Board of Bangladesh (NSB) in the nine locations of farmers’ fields of Bangladesh under field trial named proposed variety trial (PVT). Finally, after proper evaluation, the NSB team recommended IR82635-B-B-75-2 as a superior genotype in respect to drought tolerance for release as BRRI dhan66 in 2014.

Source of Information: Bangladesh Rice J. 23(1) : 45-55, 2019,

Article Link (Online Journal): doi.org/10.3329/brj.v23i1.46080

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Drought tolerant HYV at a reproductive phase in the rainfed lowland rice ecosystem is highly demanding. BRRI dhan66 can give 0.5-1.0 t ha-1more yield than BRRI dhan56 under drought-prone environments of Bangladesh. Adaptability tests of this variety under multi-location trials in the farmers’ field showed satisfactory performance with respect to grain yield and some yield contributing parameters. It is anticipated that this drought-tolerant rice variety will contribute to the national gross domestic product (GDP) and also alleviating poverty from the drought-prone northern region of Bangladesh and thus will contribute to sustainable food security.

Knowledge Management: Journal