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Study on Irrigation Requirement for Rice-based Cropping Patterns Under Irrigated Environment-2001

Dr Manoranjan K Mondal
Senior Scientific Officer
IWM Division, BRRI

Abstract/ Executive Summary:

To quantify minimum irrigation requirement and explore possibilities of maximum rainwater utilization for dominant cropping patterns, an experiment was conducted to compare two dominant cropping pattern at BRRI farm Gazipur during 2000-2001. Results from experiment on irrigation requirement for rice based cropping patterns show that minimum irrigation water required in Aus-Aman-Rabi pattern than in Aman-boro-fallow pattern, as Aus-Aman-Rabi pattern utilized (62%) more rainwater than Aman-boro-fallow (59%) pattern. Total irrigation requirement of Aus-Aman-Rabi pattern was 369 mm and that of Aman-boro pattern was 1101 mm and 1225 mm, respectively in BRRI dhan28 and BRRI dhan29.

Keywords: Irrigation requirement, Rice-based cropping patterns, Rainfall

Location: BRRI farm, Gazipur

Start Date: 01-07-2000

End Date: 30-06-2001

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To explore the possibilities of maximum rainfall utilization for two dominant rice-based cropping patterns
To quantify irrigation water required for two dominant cropping patterns

Methodology:

Two dominant cropping pattern were considered in this study to determine the minimum and profitable water requirement: P₁=Aus-Aman-Rabi and P₂=aman-boro. The study was conducted in Aus, Aman and boro season. BRRI dhan26, BRRI dhan30, BRRI dhan28, BRRI dhan29 was used in Aus, Aman and boro season, respectively. Kheshari and field pea was sown in rabi season. Applied water and rainfall during crop period was considered for total water requirement. Volumetric method and v-notch was used to measure the water requirement.

Source of Information: Proceedings of BRRI Annual Internal Research Review, 2001

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Total rainfall during the growing season of BRRI dhan26 was 507 mm from which 98 mm was drained out to facilitate top-dressing of urea. Irrigation (129 mm) was applied only twice due to favourable rainfall. Thus in Aus season, total water used 538 mm, yield was 4081 kg/ha and water productivity was 7.59 kg/ha-mm. Total rainfall during growing season was 777 mm in pattern 1 and 1002 mm in pattern 2. About 240 mm and 465 mm irrigation was used in P₁ and P₂, respectively. More irrigation was needed in pattern 2 because of early transplanting and irrigation scheduling was not synchronized with the occurrence of rainfall. Total rainfall during the growing period of BRRI dhan28 and BRRI dhan29 was 93 and 376 mm, respectively. In respect of water requirement, Aus-Aman-Rabi pattern is better than Aman-boro-fallow pattern.

Knowledge Management: Report/Proceedings