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Suitable Transplanting Time for the Modern T. Aman Rice Varieties in Tidal Nonsaline Wetland Situation of Bangladesh

B.C. Roy
Bangladesh Rice Research Institute, Regional Station, Sagardi, Barisal-8200, Bangladesh.

M.A. Hossain
Bangladesh Rice Research Institute, Regional Station, Sagardi, Barisal-8200, Bangladesh.

M.A.I. Khan
Bangladesh Rice Research Institute, Regional Station, Sagardi, Barisal-8200, Bangladesh.

Abstract/ Executive Summary:

The experiment was conducted to findout the transplanting effects on growth and yield of five modern varieties and to identify suitable varieties for late T. Aman season during 2000 and 2001. The varieties used were BR23 and BRRI dhan33, BRRI dhan37, 38 and 39. Results showed that the planting rice in the month of August was found to be very much risky due to tidal water pressure which mostly led to total crop damage. Early September was the suitable transplanting time of modern varieties for higher grain yield. The results indicated that the varieties like BR23, BRRI dhan 37 and 38 could easily be transplanted up to the 4th week of September with a reasonably higher yield of about 3 t ha^-1 in the southern region (tidal non-saline area) of Bangladesh.

Keywords: Planting time, Modern T. Aman varieties, Tidal wet land situation, Late planting

Location: Bangladesh Rice Research Institute, Regional Station, Sagardi farm, Barisal

Start Date: 00-00-2000

End Date: 00-00-2001

Program Area: Crop-Soil-Water Management

Non-commodity: Rice

Objectives:

To determine the appropriate planting time of modern varieties for higher grain yield as well as to find out suitable modern varieties especially for the late season planting with a reasonable higher grain yield during T. Aman season in the non saline tidal wetland situation of Bangladesh.

Methodology:

The field experiments were conducted at the Bangladesh Rice Research Institute (BRRI), Regional Station, Sagardi farm, Barisal during transplanted Aman (T. Aman) season in the year 2000 and 2001. The experimental field was under non-saline area. Five modern T. Aman varieties; BR23, BRRI dhan33, 37, 38 and 39 were transplanted at about 15 days interval starting from the first week of August and continued up to mid September and beyond that planting interval was about 7 days and continued up to mid October. In the first year, the transplanting dates were Aug. 05 and 15; Sep. 04, 14,23,30 and Oct. 7, 14 and in the following year, the dates were Aug. 01 and 15; Sep. 04, 14, 23, 30 and Oct. 7, 14. The results obtained from last planting (14th October) was discarded from the analysis due to abnormal flowering and very poor performance of the crop. Seedlings 30 to 33 day-old were transplanted up to Aug. 30 and after that 45 to 48 day-old seedlings were transplanted with 3 to 5 seedlings hill-I with a spacing of 20 x 20 cm. The scheduled dates of transplanting could not be maintained because of unpredictable and unexpected excess tidal water and stagnation periods in the field The experiment was laid out in a split plot design with planting dates in the main plots and varieties in the subplots. The unit plot size was 4 x 3 m. The treatments were replicated thrice. The fertilizer rates were 60-40-40-10- 4 kg ha^-1 N-P₂O₅-K₂OS-Zn, respectively. Fertilizers except N were applied during final land preparation. Nitrogen was applied as top dress in 3 equal splits. First top dress was applied between 10 and 15 days after transplanting (DAT), second between 30 and 35 DAT and the last at 5 to 7 days before panicle initiation stage. The field was kept insect free by 2-3 times insecticide application and weeding was done to keep the field weed free as and when necessary. At maturity, the panicle number m^-2 was calculated from randomly selected 20 hills from each unit plot. Two hills with average panicle number were selected from each unit plot., from these hills grains panicle^-1 and sterility percentage were calculated. For obtaining grain yield, 5 m² area from the Centre of each unit plot was harvested. The grain yield was adjusted at 14% moisture content The collected data were analyzed following standard statistical procedure.

Source of Information: Pakistan Journal of Biological Sciences 6 (7): 661-665, 2003 ISSN 1028-8880

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 50,000/-

Total Budget (Tk.) :

Achievement/Findings:

It was concluded that transplanting in the early September would give higher grain yield, before that there was every possibility of crop damage due to tidal water. For late plantation, the varieties like BR23, BRRI dhan 37 and 38 might be used to achieve reasonably good harvest in the tide affected area during T. Aman season. These varieties could be better substitutes of low yielding local cultivars, avoiding the usual difficulties and risks associated with early T. Aman cultivation using modern varieties in the tidal wetland situation of Bangladesh.

Knowledge Management: Journal