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Rainwater Harvest in a Minipond for Supplemental Irrigation in T. Aman Rice Cultivation

Dr. M Towfiqul Islam
SSO
Irrigation and Water Management Division, BRRI, Gazipur-1701, Bangladesh

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

Abstract/ Executive Summary:

The study was conducted to supplemental irrigation during drought period in T. Amanat Charghat, Rajsshahiu nder IFAD funded project. Two miniponds were excavated and the size of each minipond was 7x7x2 m with 2:1 side slope. The soil type was sandy loam. Four different strategies were followed to utilize stored water. From the pond for supplemental irrigation during drought. An agromat station was installed at the site and from this station rainfall, evaporation, temperature and depth of ground water table were collected. A staff gauge was installed in each minipond for recording daily water level. A BRRI design diaphragm pump was used to lift water manually from minipond and the volume of water used for supplemental irrigation was measured by v-notch. One plot was selected by the side of each minipond for research purpose. Each plot was divided into two parts. one part was supplied with supplemental irrigation and the other part was for rainfed condition. The T. aman variety (BR22) was planted on 31 August in each plot. The N-P-K fertilizer was applied at the rate of 80-60-40 kg/ha. Substantial storage of rainwater in minipond commenced from last week of June and through out the season 77 cu m. of water was harvested. But the maximum storage capacity of the minipond is 52 cu m. Forty seven percent of stored water (36 cu.m) was usec as supplemental irrigation and 53% water (41 cu.m) was lost due to evaporation and percolation. Five supplemental irrigation from minipond were supplied to the experimental plot. As a result the crop could survive upto booting stage, but crop growth became stunted and no panicle emerged. Ultimately the crop was used as fodder.

Keywords: Minipond, Rainwater harvest, Supplemental irrigation

Location: Charghat, Rajshahi

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rain water

Objectives:

To supplemental irrigation during drought period in T. Aman

Methodology:

The study was conducted at Charghat, Rajsshahiu under IFAD funded project. Two miniponds were excavated and the size of each minipond was 7x7x2 m with 2:1 side slope. The soil type was sandy loam. Four different strategies were followed to utilize stored water. From the pond for supplemental irrigation during drought. An agromat station was installed at the site and from this station rainfall, evaporation, temperature and depth of ground water table were collected. A staff gauge was installed in each minipond for recording daily water level. A BRRI design diaphragm pump was used to lift water manually from minipond and the volume of water used for supplemental irrigation was measured by v-notch. One plot was selected by the side of each minipond for research purpose. Each plot was divided into two parts. one part was supplied with supplemental irrigation and the other part was for rainfed condition. The T. aman variety (BR22) was planted on 31 August in each plot. The N-P-K fertilizer was applied at the rate of 80-60-40 kg/ha.

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

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Forty seven percent of stored water (36 cu.m) was use as supplemental irrigation and 53% water (41 cu.m) was lost due to evaporation and percolation. Five supplemental irrigation from minipond were supplied to the experimental plot. As a result the crop could survive upto booting stage, but crop growth became stunted and no panicle emerged. Ultimately the crop was used as fodder.

Knowledge Management: Report/Proceedings