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Cold Tolerance of Some Exotic Rice (oryza Sativa L.) and Its Yield

J. C. Biswas
Senior Scientific Officer
Agronomy Division, Bangladesh Rice Research Institute (BRRI), Joydebpur, Gazipur-1701, Bangladesh.

Abstract/ Executive Summary:

Cold injury of Boro (dry season irrigated crop) rice is a common physiological condition for northern part of Bangladesh. So far only one high yielding Bangladesh Rice Research Institute (BRRI) variety, BRRI dhan36 is reported cold tolerant. Therefore, exotic rice varieties were screened to use in breeding cold tolerant HYV at Rangpur Regional station of BRRI during 1999 through 2002. Out of seventy exotic rice varieties two entries could be released as future variety in Bangladesh. The entry IR61728-4B-2-1-1 significantly and consistently gave higher grain yield than BRRI dhan36 having almost similar growth duration. Grain yield of Sijung10 was statistically similar to BRRI dhan36 but matured earlier by about 10 days.

Keywords: Boro rice, Cold tolerance, Yield, Randomized Complete Block Design

Location: Rangpur Regional station, Bangladesh Rice Research Institute.

Start Date: 01-01-1999

End Date: 30-06-2002

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To find out cold tolerant rice genomes and its agronomic performance;
To regards the grain quality, yield and growth duration.

Methodology:

Rice varieties were used as treatments. Seventy exotic rice genotypes were evaluated for cold tolerance and compared with BRRI dhan36. A Randomized Completed Block Design (RCBD) was used with two replications. Fertilizer was applied @120-26-50-30 kg/ha of N-P-K-S, respectively. Full dose of TSP, MP and gypsum was applied at final land preparation. Urea was applied in three equal dose, one third at 15 Days After Transplanting (DAT), one third at 55 DAT and rest at 70 DAT. Sixty-day-old single seedling was transplanted on 18 February at 30 X 10 cm spacing. Only eight genotypes were selected initially for further evaluation. In 2000/2001, selected eight entries were grown in a RCBD with three replications for determination of agronomic performance in relation to grain yield and growth duration. Fertilizers were applied similarly except the rate of urea, which was used at 100 kg N/ha. This lower N rate was used based on previous year's wxperience of December 2000 at 20 X 20 cm spacing. In few genotypes viviparous germination was observed, so only four entries were selected and was further evaluation in 2001/02 Boro season. Forty-day-old seedlings were selected transplanted on 20 Junuary. Plant height, panicle number, panicle exertion, grain yield and growth duration was recorded. Grain yield was adjusted at 14% moisture content. Collected data were analyzed by IRRISTAT and means were completed following DMRT.

Source of Information: SAARC JOURNAL OF AGRICULTURE Vol. 1, 2003, ISSN 1682-8348 SAARC Agricultural Information Centre.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From this experiment it is concluded that IR61728-4B-2-1-1 and Sijung10 performed better than the existing cold tolerant BRRI dhan36 variety in terms of grain yield and growth duration in cooler and drier part of Bangladesh.

Knowledge Management: Journal