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Assessment of Drought, Its Impact and Alleviation Opportunities in Major Rainfed Lowland Rice Areas: Magura District-1997

M Nurul Islam
CSO and Head
Irrigation and water Management Division, BRRI, gazipur-1701, Bangladesh.

Abstract/ Executive Summary:

This study has been taken at Sadar thana of Magura district (north-west part of Bangladesh). The study has been initiated with some survey on farmers’ cultural practices, yield of rice etc. and also knowing the rainfall probability of each 5 days of each month at 50 % and 80% dependable level. Rainfall of 36 years of both places was collected from BWDB and probability analysis has been done. About 50% farmers has transplanted T.Aman on 15 August and harvested on 24 November in 1997, while those farmers transplanted and harvested on 27 July and 21 November in 1996. It has been found from probability analysis rainfall occurs at 50% probability was 344 mm from June up to transplant, 450 mm from transplant to harvest and 66 mm only in the month of October i.e. during reproductive stage of the crop. It indicates rainfall was sufficient for transplanting and not enough for growing crop and very insufficient for reproductive stage of the crop. As total evapotranspiration (ET) during reproductive period was higher than total rainfall and relative water supply (RWS) was 0.08 resulted drought and consequently yield of T. Aman was reduced. It was found from survey that average yield of T.Aman (MV variety) was 2.14 t/ha.

Keywords: Drought prone area, RWS, Probability analysis

Location: Sadar thana of Magura district

Start Date:

End Date:

Program Area: Risk Management in Agriculture

Commodity: Rice

Objectives:

1.To evaluate the nature, extent and frequency of droughts in major rainfed lowland rice systems

2.To understand the farmers management practices, especially for drought alleviation

3.To assess the farm productivity and impact of droughts on yield

4.To study the drought alleviation opportunities for enhancing and sustaining farm productivity

Methodology:

This study has been taken at Sadar thana of Magura district (north-west part of Bangladesh). The study of Magura has been initiated with some survey on farmers’ cultural practices, yield of rice etc. and also knowing the rainfall probability of each 5 days of each month at 50 % and 80% dependable level. Rainfall of 36 years of both places was collected from BWDB and probability analysis has been done.

Source of Information: Proceedings of the Annual Internal Review 1997, BRRI, gazipur-1701, Bangladesh

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The study area is drought prone at two stages of Aman rice i.e., at the beginning of the crop season which can cause delay in transplanting; and at the beginning of the ripening stage (from early October). The probability of 10 day and 15 day droughts during the ripening period are 73 and 53%, respectively. The RWS in an average year is 0.79 and can go down to 0.51 in 2 out of ten years. The crop yield is uncorrelated with total seasonal rainfall but it has a good correlation with rainfall during the ripening period.

Knowledge Management: Report/Proceedings