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Ratooning Ability of Photoperiod-sensitive Rice Varieties Transplanted in the Boro Season

B.C. Roy
Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh.

M.A. Hossain
Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh.

M.A. Rahman
Bangladesh Rice Research Institute, Gazipur 1701, Bangladesh.

Abstract/ Executive Summary:

A field experiment was conducted at the Bangladesh Rice Research Institute, Charbadna farm, Barisal, during boro 2001 to aman 2002. Seven photoperiod-sensitive rice varieties including three fine grain aromatic varieties were transplanted in December 15-30, 2001. After harvest of boro crop the ratoons, came out from the remaining straw and base of the hills, were allowed to grow and in the succeeding aman a good harvest was obtained from those ratoons. In the boro season, the highest yield was obtained from BRRI dhan41 followed by BR23 (7.51 and 7.06 t ha^-1, respectively). The yield of aromatic varieties was about 5 t ha^-1. The ratoon-yields of both aromatic and non-aromatic varieties in the succeeding aman season were also encouraging and produced about 2 t ha^-1, which was more than the average yield of local varieties normally cultivated in the transplanted aman season in that region. The highest yield was obtained from BR23 (2.87 t ha^-1) followed by BRRI dhan37 (2.63 t ha^-1). From this experiment, it was revealed that, the photoperiod- sensitive rice varieties could be planted in the early boro season and the ratoons from this crop also could produce a good harvest. This technique, might be a low-cost rice cultivation one in those areas, where crop establishment in the transplanted aman season was found to be somewhat difficult due to early intrusion of tidal water in the field at the end of boro season

Keywords: Ratoon, Photoperiod-sensitive,Tidal water, Bora, Aman season

Location: Bangladesh Rice Research Institute farm, Charbadna, Barisal.

Start Date: 00-00-2001

End Date: 00-00-2002

Program Area: Knowledge Management

Commodity: Rice

Objectives:

To find out the feasibility of ratooning of rice from the photoperiod-sensitive varieties transplanted in the boro season.

Methodology:

The experiment was conducted at the Bangladesh Rice Research Institute farm, Charbadna, starting from boro 2001 and continued up to aman season of 2002. Seven photoperiod-sensitive rice varieties, BR22, BR23, BRRl dhan34, BRRl dhan37, BRRI dhan38, ERRl dhan40 and ERRI dhan41 were planted in December 15 and December 30, of which BRRI dhan34, BRRl dhan37 and BRRl dhan38 were fine-grained aromatic rice. Forty-five day-old seedlings were transplanted maintaining 20x20 cm spacing. The experiment was laid out in a split plot design with planting time in the main plot and varieties in the sub plot. Each treatment was replicated thrice. Normal crop management practices were done during boro season. After maturity of the boro crop, it was harvested leaving lower 15 cm straw in the field. The new tillers came out from the nodes of the remaining straw and basal portion of the hills were allowed to grow. After 15 days of boro harvest, weeding was done and urea fertilizer@ 40 kg N ha^-1 was top-dressed. Insecticide was applied two times, first 25 days after boro harvest and the last at 15 days before panicle initiation. In the boro season, yield data were recorded In the following aman season plant height, panicle number, thousand-grain weight, sterility percentage and grain yield of the ratoon crop were recorded. The data obtained were statistically analyzed by a standard statistical procedure.

Source of Information: Pakistan Journal of Biological Sciences 7 (3): 368-371, 2004; ISSN 1028-8880

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It could be concluded that, the early boro season rice produced more yield and their ratoons also yielded a good harvest. Therefore, ratoons from boro crop could be a low-cost cultivation technique in those areas where crop establishment in the aman season had been observed to difficult due to early intrusion of tidal water in the field ahead of the end of boro season.

Knowledge Management: Journal