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Early Maturing Drought Tolerant Rice Variety BRRI Dhan71 Suitable for Drought Prone Environment in Bangladesh

Md. Abdul Kader
Plant Breeding Division, Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh

Tamal Lata Aditya
Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh

Ratna Rani Majumder
Plant Breeding Division, Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh

Tapas Kumer Hore
Plant Breeding Division, Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh

Md. Ehsanul Haq
Plant Breeding Division, Bangladesh Rice Research Institute (BRRI), Gazipur-1701, Bangladesh

Abstract/ Executive Summary:

Drought is the second most treacherous climate-related risk for rice production in rainfed lowland areas. To counter this climate vulnerability, a new rice variety with enhanced drought tolerance was developed. The promising line IR82589-B-B-84-3 was subjected to advanced yield trials to evaluate specific and general adaptability with standard check in on-station as well as on-farm conditions of Bangladesh following randomized complete block (RCB) design with three replications in wet (T. Aman) season. IR82589-B-B-84-3 was developed as a drought-tolerant rice variety BRRI dhan71, which plant height 108 cm and growth duration 115 days after proper evaluation by National Seed Board (NSB) Bangladesh. It was found that this variety is the higher drought tolerance (up to 28 days) during reproductive stage. It can produce 5.5 t/ha grain yield in standard condition and 4.0 t/ha grain yield in medium drought condition but 3.0-3.5 t/ha grain yield in severe drought condition. Grain yield is also not affected by water scarcity during reproductive stage where parch water table depth is more than 70-80 cm from the surface and reduced soil moisture (<20%). Thousand grain weight of the variety is 24 gm, amylose content is 24%. It has long, erect and deep green colored flag leaf. The results indicated that farmers can maximize net profit by cultivating BRRI dhan71 because it required less input, early maturing than existing varieties, drought tolerant and they also get opportunity to cultivate Mustard, Barley, Potato and vegetables after harvesting it. Thus total productivity will be augmented and food security can also be sustained by the cultivation of BRRI dhan71.

Keywords: BRRI dhan71; Drought; Rice; Rainfed, Lowland

Location: National Seed Board (NSB) Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice, Drought

Objectives:

The main objective of thisstudy is to evaluate agronomic parameters of a drought tolerant rice variety BRRI dhan71 under controlled and natural condition and it’s suitability for drought prone rainfed lowland rice ecosystem.

Methodology:

BRRI dhan71 was developed from a single cross between IR55423-01 (NSIC RC 9) and IRRI148, with the aim to develop a drought tolerant rice variety. The pedigree of BRRI dhan71 is IR82589-B-B-84-3. The fixed line was introduced from IRRI in 2012 and conducted advanced yield trial in the different drought prone areas of Bangladesh until 2014. The promising line was subjected to Advanced Yield Trial (AYT) to evaluate specific and general adaptability with standard check BRRI dhan56 in on-farm condition of six locations of Bangladesh following randomized complete block (RCB) design with three replications in T. Aman 2012 (July -December). 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 2013, conducted by Adaptive Research Division (ARD) of BRRI. This genotype was tested for different physico-chemical properties, cooking qualities and find out best planting time, disease-insect resistance ability under natural condition, 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 sq-m sample plot in each replication. In T. Aman 2014, IR82589-B-B-84-3 (BRRI dhan71) was evaluated by the National Seed Board of Bangladesh (NSB) in the nine locations of farmers’ field of Bangladesh under field trial name Proposed Variety Trial (PVT). Finally after proper evaluation the NSB team found IR82589-B-B-84-3 as a superior genotype in respect to drought tolerance has been released as BRRI dhan71 in the year 2015. The agro-morphological data like growth duration, plant height, grain yield etc. were subjected to statistical analysis to determine heritability, least significant difference (LSD), mean, Additive Main effects and Multiplicative Interaction (AMMI) Biplot, Adaptation map

Source of Information: International Journal of Plant & Soil Science; 32(12): 1-11, 2020

Article Link (Online Journal): DOI: 10.9734/IJPSS/2020/v32i1230347

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Drought tolerant high yielding rice variety at reproductive phase in rainfed lowland rice ecosystem is highly demanding. BRRI dhan71 can give 0.5-1.0 t/ha more yield than BRRI dhan56 at drought prone environments of Bangladesh. However, BRRI dhan71 was finally released as a high yielding and drought tolerant rice variety for drought prone areas 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 alleviate poverty from drought prone northern regions of Bangladesh.

Knowledge Management: Journal