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Judicious Irrigation for Increasing Water Productivity of Rice and Improvement of Minor Irrigation Project Performance.

Dr. Mesbauddin Ahmed
Professor
Department of irrigation and water management, BAU, Mymensingh-2202.

Abstract/ Executive Summary:

Three experiments on irrigated rice one in Aman season in 2006 and the other two in Boro seasons in 2007 and 2008 were carried out at the Bangladesh Agricultural University (BAU) farm. In aman season, the average optimum yield of 4.85 t/ha was obtained for BR11 where 7 cm irrigation water was applied after 5 days of disappearing standing water. Which indicates that supplement irrigation is necessary for optimum yield for aman rice. The corresponding water productivity was found to be 0.75 kg/m3. The boro season experimental findings revealed that an optimum yield of 6.25 t/ha may be obtained from BRRI dhan29 having a water productivity of 0.95 kg/m3. The farmers may be suggested to irrigate their lands 3 days after disappearance of water from the soil surface in case of silty loam soil. The farmers under the command areas of shallow and deep tubewells at the adjoining areas of BAU were advised and provided necessary guidelines so as to reduce the conveyance losses and hence cut down the cost of irrigation. The discharges of deep and shallow tubewells as well as channel losses at BAU adjoining farmers fields were determined. The discharges of shallow tubewells were found to be 9.00 l/s for motor operated and 6.83 l/s for engine operated pumps, whereas, the discharge of deep tubewell was found to be 50.12 l/s. The average conveyance loss for shallow tubewell scheme was 10.8 l/s/100m, whereas, the same for deep tubewell scheme was 6.51 l/s/100m. The maximum (12.33m) and minimum (4.35 m) depths of groundwater levels were observed during April and September, respectively. During January to May the groundwater level was found suction lift (8 m) limit, indicating that shallow tubewells does not work during this period.

Keywords: Judicious irrigation, Water productivity, Minor irrigation project

Location: Bangladesh Agricultural University Farm and adjoining farmers field.

Start Date: 01-07-2006

End Date: 30-06-2008

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

1) To increase the water productivity of rice at BAU farm and adjoining farmers field. 2) To improve the performance of minor irrigation projects. 3) To analyze the GW level fluctuation trend at BAU.

Methodology:

Experiments will be conducted both at BAU farm and adjoining farmers fields on the basis of BRRI recommended irrigated rice production technologies. Water users association will be formed through motivation and PIM approach, which will help develop water saving techniques, reduced land use and labour required for on-farm water distribution. Evaluation of performance of the selected DTW and STW schemes will be carried out using a standard set of performance indicators namely, Delivery performance ratio (DPR), Water delivery performance (WDP), Conveyance loss ratio (CLR), Relative water supply (RWS), Overall reliability (OR), Irrigation area ratio (IAR), Yield ratio (YR), Production ratio (PR), and Sustainability of irrigated area (SIA). Field data will be collected through direct measurements and questionnaire surveys. Secondary data on GW level fluctuation available in the department of IWM and BINA will be analyzed to prepare guidelines for using suction mode or force mode pumps for GW abstraction.

Source of Information: Bangladesh Agricultural University Research Progress. Volume-19. Proceedings of the Workshop of Bangladesh Agricultural University Research Progress, 08-09 March, 2009.

Article Link (Online Journal):

Funding Source:

1.	Budget: 150000

Total Budget (Tk.) : 150000

Achievement/Findings:

1. Water productivity of rice at BAU farm increased. 2. Seepage and conveyance (S & P) loss at BAU farm reduced. 3. Water productivity of rice at farmers' fields around BAU increased. 4. S & P loss at farmers' fields around BAU. 5. Ground water level fluctuation trend reduced at BAU determined.

Knowledge Management: Report/Proceedings