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Cut-off Dates for Planting Modern T. Aman Rice Varieties in the Northern Region of Bangladesh

S B Siddique
Agronomy Division, Bangladesh Rice Research Institute, Gazipur 1701

M A Mannan
Agronomy Division, Bangladesh Rice Research Institute, Gazipur 1701

K U Ahmed
Agronomy Division, Bangladesh Rice Research Institute, Gazipur 1701

M A Jabbar
Agronomy Division, Bangladesh Rice Research Institute, Gazipur 1701

A A Chowdhury
Agronomy Division, Bangladesh Rice Research Institute, Gazipur 1701

Abstract/ Executive Summary:

In the northern parts of Bangladesh, temperature falls earlier than the other parts of the country. Modern T. Aman varieties like BR10, BR11, BR22 and BR23 are gaining popularity in this zone. Considering the above facts this study was, therefore, conducted to determine the cut-off dates of modern varieties compared to traditional variety Nizersail in three locations in the northern part of Bangladesh during 1988, 1989 and 1990. Experiments were conducted at the BRRI, Rajshahi; BARI, Rangpur and Thakurgaon farms. The experiments were laidout in split-plot design of four replications with planting dates as the main plot and varieties as the sub plot. The findings revealed that in the Thakurgaon zone, none of the modern rice varieties should be planted beyond 15 August. ln other parts (Rangpur and Rajshahi), BR11 can be planted up to 30 August and BR22, BR23 up to mid September.

Keywords: Cut-off dates of planting, Modern T. Aman, Rice varieties, Northern Region of Bangladesh

Location: BRRI, Rajshahi; BARI, Rangpur and Thakurgaon farms

Start Date: 01-07-1988

End Date: 31-12-1990

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To determine the cut-off dates of modern varieties compared to traditional variety

Methodology:

The study was conducted to determine the cut-off dates of modern varieties compared to traditional variety Nizersail in three locations in the northern part of Bangladesh during 1988, 1989 and 1990. Experiments were conducted at the BRRI, Rajshahi; BARI, Rangpur and Thakurgaon farms. The experiments were laidout in split-plot design of four replications with planting dates as the main plot and varieties as the sub plot. Fertilizer were applied at the rate of 60-40-40 kg N, P₂0₅ and K₂0/ha as urea, triple superphosphate and muriate of potash, respectively. Transplanting started from July 16 and continued up to 7 October. Thirty-day-old seedlings were transplanted up to 16 September at 15 days intervals at 25- x 15-cm spacing. On the other hand, 45-day-old seedlings were transplanted from 22 September to 7 October with an interval of 7 days using 5-6 seedlings per hill at 20- x 15-cm spacing.

Source of Information: Bangladesh Rice J. 5(1&2): 111-113, 1994

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The findings revealed that in the Thakurgaon zone, none of the modern rice varieties should be planted beyond 15 August. ln other parts (Rangpur and Rajshahi), BR11 can be planted up to 30 August and BR22, BR23 up to mid September.

Knowledge Management: Journal