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Impact of Supplemental Irrigation in T. Aman Cultivation by Using Shallow Tubewel

M Nurul Islam
CSO and Head
Irrigation and Water Management Division, BRRI, Gazipur-1701, Bangladesh.

Abstract/ Executive Summary:

A field survey was conducted to assess and document the use of existing farmer managed STW for supplemental irrigation in crop production and to assess the technical and socio- economic aspect of STW utilization in 1992 T. Aman season by interviewing two categories of farmers (supplemental irrigation and Rainfed). Seventy farmers were interviewed from each group from the selected locations of Bogra, Shariakandi, Rajshahi, Naogoan, Gaibandha, Mithapukur and Thakurgoan in the vicinity of 20 STWs. The data were collected on technical and socio- economic aspects. The timing of farming activities from land preparation to ripening stage of T. Aman cultivation and the corresponding rainfall amount has significant impact on success of crop yield.If uniform rainfall occurred during the T. aman season then optimum yield of rice can be harvested. Normally at the later part of T. Aman, very amount of rainfall occurred which could not meetup the demand of the crop water requirement. Therefore, rice yield drastically reduced due to water stress. It was evident from the study that in Rangpur area during last T.Aman (1992) cultivation a minimum stress was occurred at the vegetative stage which produced on an average about 3030 kg/ha of rice yield. On the other hand the lowest yield was found 2379 kg/ha for the same variety in Rajshahi when water stress occurred at both vegetative and reproductive stages. On an average about 650 kg/ha yield reduction occurred due to water stress. It was also observed from the study that the yield reduction has a direct correlation with the water stress. Where water stress occurred both in vegetative and reproductive stages the yield of BR11 was always lower. This trend of yield reduction due to water stress was supported by Sattar (1992). The author reported that if water stress occurs at the vegetative stage, yield reduces from 15% to 25% whereas water stress in reproductive stage reduces yield, even upto 50% over the rainfed condition.

Keywords: Supplemental irrigation, Terminal drought, STW

Location: Bogra, Shariakandi, Rajshahi, Naogoan, Gaibandha, Mithapukur and Thakurgoan

Start Date: 00-00-1992

End Date: 00-00-1992

Program Area: Farm Mechanization

Commodity: Tubewell

Objectives:

To assess and document the use of existing farmer managed STW for supplemental irrigation in crop production
To assess the technical and socio- economic aspect of STW utilization

Methodology:

A field survey was conducted in 1992 T. Aman season by interviewing two categories of farmers (supplemental irrigation and Rainfed) to know the impact of supplemental irrigation over Rainfed condition. Seventy farmers were interviewed from each group from the selected locations of Bogra, Shariakandi, Rajshahi, Naogoan, Gaibandha, Mithapukur and Thakurgoan in the vicinity of 20 STWs. The data were collected on technical and socio- economic aspects. The timing of farming activities from land preparation to ripening stage of T. Aman cultivation and the corresponding rainfall amount has significant impact on success of crop yield.

Source of Information: Proceedings of the BRRI Annual Review for 1992, BRRI, Gazipur-1701, Bangladesh

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It was evident from the study that in Rangpur area during last T.Aman (1992) cultivation a minimum stress was occurred at the vegetative stage which produced on an average about 3030 kg/ha of rice yield. On the other hand the lowest yield was found 2379 kg/ha for the same variety in Rajshahi when water stress occurred at both vegetative and reproductive stages. On an average about 650 kg/ha yield reduction occurred due to water stress. It was also observed from the study that the yield reduction has a direct correlation with the water stress. Where water stress occurred both in vegetative and reproductive stages the yield of BR11 was always lower. This trend of yield reduction due to water stress was supported by Sattar (1992). The author reported that if water stress occurs at the vegetative stage, yield reduces from 15% to 25% whereas water stress in reproductive stage reduces yield, even upto 50% over the rainfed condition.

Knowledge Management: Report/Proceedings