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Effect of Low Temperature Stress in Transplanted Aman Rice Varieties Mediated by Different Transplanting Dates

Kamrun Nahar
Department of Agricultural Botany, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Mirza Hasanuzzaman
Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Ratna Rani Majumder
Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur-1703, Bangladesh

Abstract/ Executive Summary:

Keywords: Rice, Cold Stress, Agro-climate, Panicle emergence, Sterility

Location: Experimental farm of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh

Start Date: 00-00-2008

End Date: 00-00-2008

Program Area: Variety and Species

Commodity: Rice

Objectives:

To study the effect of low temperature stress influenced by date of transplanting on yield attributes and yields of two rice varieties.

Methodology:

A field experiment was carried out during the Aman (monsoon) season of 2008 at the experimental farm of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh to study the effect of low temperature stress influenced by date of transplanting on yield attributes and yields of two rice varieties. The experiment consisted of with 2 varieties (BRRI dhan46 and BRRI dhan31) and 4 transplanting dates (01, 10, 20 and 30 September, 2008). A common procedure was followed in raising of seedling in seed bed. Seedlings of 25 days old were uprooted from the nursery beds carefully. Seedlings were transplanted according to the treatments in the well-puddled experimental plots. Spacing’s were given 20 cm × 15 cm. A fertilizer dose of 80-50-50-10 kg ha^-1 of N, P₂O₅ , K₂O and S were applied as urea, triple superphosphate, muriate of potash and gypsum were applied in the field. One-third urea and full dose of triple super phosphate, muriate of potash and gypsum were applied as basal dose at the time of final land preparation and incorporated well into the soil. Besides, cowdung at the rate of 10 t ha^-1 was applied before final ploughing. Rest two-third of urea was applied in two equal splits at 30 and 55 days after transplanting (DAT). All intercultural operations were done carefully. The first weeding was done at 15 days after transplanting (DAT) followed by second and third weeding were done at 15 days interval after first and second weeding. Irrigation was done by alternate wetting and drying from transplanting to maximum tillering stage. From panicle initiation (PI) to hard dough stage, a thin layer of water (2-3 cm) was kept on the plots. Water was removed from the plots during ripening stage. The crop of each plot was harvested separately on different dates when 90% of the grains become golden yellow in color. Temperature data were recorded regularly from the field by an automatic maximum and minimum thermometer. The number of tillers hill^-1 was recorded at the maximum tillering stage. Ten random hills were collected from each plot for collection of data on plant characters and yield components. The grain and straw weights for each plot were recorded after proper sun drying and then converted into t ha^-1. The grain yield was adjusted at 12% moisture level. The data was analyzed using MSTAT-C program. The mean differences among the treatments were compared by multiple comparison tests using Duncan’s Multiple Range Test (DMRT).

Source of Information: Academic Journal of Plant Sciences, 2 (3): 132-138, 2009

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Among the planting dates 01 September transplanting provided the highest results where 30 September transplanting provided the lowest results for both cultivars. In this study harvest indices were not significantly affected by transplanting dates. Yield maintenance of the photoperiod sensitive cultivar was due to its green characteristics, leading to early flowering, low sterility and avoidance of cold injury during grain filling.

Knowledge Management: Journal