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Effect of Planting Date, Seedling Age and Variety on the Yield and Yield Components of Late Transplant Aman Rice in the Coastal Area of Bangladesh

K.P. Halder
Farm Management Division, Bangladesh Rice Research Institute Gazipur-1701, Bangladesh

M.J.U.Chowdhury
Farm Management Division, Bangladesh Rice Research Institute Gazipur-1701, Bangladesh

Abstract/ Executive Summary:

The experiment was conducted at the Bangladesh Rice Research Institute (BRRI), Regional Station, Sonagazi Farm, Feni, Bangladesh during transplanted aman (T. Aman) season in 1994 and 1995. Three rice varieties (BR10, BR23 and Rajasail), three planting dates (20 September, 30 September and 10 October) and four seedling ages (30, 45, 60 and 75 days) were evaluated to determine the optimum seedling age and planting date and, suitable variety for late T. aman season. The experiment was laid-out in a split-split plot design. Regardless of varieties and planting dates, 45 to 60 days old seedling produced higher grain yield. Among the varieties, BR23 produced the highest grain yield (2.20 to 2.21 t ha^-1 followed by BR10 (1.69 to 1.97 t ha^-1 and Rajasail (1.16 to 1.28 t ha^-1. Planting on 20 September gave the highest grain yield (2.27 to 2.32 t ha^-1) followed by 30 September (1.86 to 1.91 t ha^-1 and 10 October (1.05 to 1.11 t ha^-1).

Keywords: Seedling age, Late planting T. aman, Rice varieties and Coastal area

Location: BRRI Regional Station, Sonagazi Farm, Feni,

Start Date: 15-07-1994

End Date: 20-02-1995

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To determine the optimum seedling age and variety at different dates in T. aman season for obtaining optimum rice yield.

Methodology:

This experiment was carried out at the BRRI Regional Station, Sonagazi Farm, Feni, Bangladesh during T.aman seasons of 1994 and 1995. Two modern photosensitive rice varieties (BR10 and BR23) and one photosensitive local variety Rajasail were planted on 20 September, 30 September and 10 October by using 30 days, 45 days, 60 days and 75 days old seedlings. The experiment was laid out in a split-split plot design and replicated 3 times. The planting dates were assigned in main plots, varieties in sub-plots and seedling age in the sub-sub plots. The unit plot size was 4m x 4m. Four to 5 seedlings hill^-1 were transplanted at 20 cm X 15 cm spacing. Fertilizer was applied as basal at the rate of 30-40-40-10 Kg N, P₂0₅, K₂0, S -ha^-1 as urea, triple super phosphate, muriate of potash and gypsum, respectively. Another 30 kg N ha^-1 was applied as top dressed at 20 days after transplanting (DAT). Ten hills plot^-1 was randomly selected leaving the boarder rows and middle 5m² for counting yield components. Middle 5m² area of each plot was harvested for grain and straw yield. The grain yield was adjusted at 14% moisture content. The straw was sun-dried for 6 to 7 days. Both grain and straw yield were expressed as t ha^-1. Analysis of variance (ANOVA) was done on collected data based on split-split plot design as per Gomez and Gomez (1983).

Source of Information: Bangladesh J. Agril. Sci. 32(1): 21-28, January, 2005

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Based on these results it may be concluded that 45 to 60 days old seedling and the variety BR23 is suitable for planting on 20 to 30 September in the south-eastern coastal area of Bangladesh. Later planting, like 10 October decreased grain yield drastically (43-53%) compared to planting on 20 and 30 September.

Knowledge Management: Journal