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Managing Water and Land Resources for Sustainable Livelihoods at the Interface Between Fresh and Saline Water Environments in Vietnam and Bangladesh:study on the Impact of Different Water Regimes on the Performance of Vietnam Rice in Pre-monsoon Season in the Coastal Saline Environments in Bangladesh-2006

Dr. Manorangan Mondal
SSO
IWMD, BRRI, Gazipur

Abstract/ Executive Summary:

A field experiment was conducted to document the performance of short-duration Vietnam rice varieties under rainfed and irrigated environment in coastal saline soil; and to identify the most suitable aus variety to fit in Aus-Aman pattern for improving productivity of coastal saline soil in the southwest region of Bangladesh.Water treatments were in the main plot and rice variety in the sub-plot and were replicated thrice. The treatments were: rainfed and irrigated. The varieties were V₁ = BR24, V₂ = OM 576, V₃ = OM 1490, V₄ = OM 2718, V₅ = OM 4498, V₆ = OMCS 2000 and V₇ = AS 996.It was observed that all the tested Vietnam rice produced higher yield than BR24. Yield of BR24 was about 3.5 t/ha, whereas Vietnam rice varieties produced 4-5 t/ha yield under both rainfed and supplemental irrigated environments. The highest yield was obtained in variety OM 1490 followed by OM 4498. Growth duration of OM 1490 and AS 996 was 108 days, about 12 days earlier than BR24; all other varieties had almost similar growth duration as in BR24. Water productivity under rainfed environment was slightly higher than supplemental irrigated treatments and all the Vietnam rice varieties had higher water productivity than BR24. The highest and lowest water productivity was obtained in OM 1490 and BR24, respectively. Therefore, OM 1490 is the most promising aus rice for the coastal region of Bangladesh, which could be easily fitted in Aus-Aman cropping pattern to improve the productivity of this region by utilizing available coastal water resources. As this is a one season study, further study is needed to confirm the finding.

Keywords: HYV, Coastal saline area, Vietnam rice varieties, Rainfed, Different water regimes

Location: Khulna

Start Date: 01-07-2005

End Date: 30-06-2006

Program Area: Crop-Soil-Water Management

Commodity: Water management

Objectives:

To document the performance of short-duration Vietnam rice varieties under rainfed and irrigated environment in coastal saline soil; and
To identify the most suitable aus variety to fit in Aus-Aman pattern for improving productivity of coastal saline soil in the southwest region of Bangladesh.

Methodology:

An experiment was set-up in aus season 2005 at Fultola village under Batiaghata upazila of Khulna district in split plot design. Water treatments were in the main plot and rice variety in the sub-plot and were replicated thrice. The treatments were: rainfed and irrigated. The varieties were V₁ = BR24, V₂ = OM 576, V₃ = OM 1490, V₄ = OM 2718, V₅ = OM 4498, V₆ = OMCS 2000 and V₇ = AS 996. Six high yielding varieties (HYV) of Vietnam rice (exchanged through CPWF project #7) were grown under rainfed and supplemental irrigated condition in Aus season 2005. BR24 was used as check variety. The land was prepared completely under dry condition by a power tiller using 4 plowing and followed by laddering. Weeds from the dry land were removed before seeding. All the rice varieties were grown under direct dry seeding method in 2 m x 10 m plots. Seeds of BR24 were sown on 12 April 2005 and the Vietnam rice varieties were sown on 3 May 2005 (due to late arrival from Vietnam) with 20 cm line spacing. The fertilizer rate was 135-100-70-60-10 kg urea-TSP-MP-Gypsum-Zinc sulfate per ha. The whole amounts of P, K, Zn and S were applied at the time of final land preparation on 10 April 2005. Urea was top dressed in 3 equal splits at 15-20, 40-55 and 70 days after sowing seeds. Weeding was done 3 times synchronizing with the top dressing of nitrogen fertilizer. Insecticide was applied twice to control insect pest infestation. In irrigated treatment, about 10 mm irrigation water was applied to facilitate germination. After that 7 live saving irrigation amounting 50 mm water was applied in May 2005, discontinued supplemental irrigation when salinity of canal water increased to more than 4 dS/m due to salt water intrusion in the canal from the river. The crop was then left to grow under rainfed condition. BR24 was harvested in the first week of August 2005 and 2 Vietnam rice varieties were harvested in the second week and 4 in the third week of August 2005. Rice yield was determined on the basis of 2 m² harvest area from each plot and finally expressed at 14% moisture content.

Source of Information: Proceedings of the BRRI Annual Internal Review, 2006

Article Link (Online Journal):

Funding Source:

1.	Budget:
2.	Budget:

Total Budget (Tk.) :

Achievement/Findings:

It was observed that all the tested Vietnam rice produced higher yield than BR24. Yield of BR24 was about 3.5 t/ha, whereas Vietnam rice varieties produced 4-5 t/ha yield under both rainfed and supplemental irrigated environments. The highest yield was obtained in variety OM 1490 followed by OM 4498. Growth duration of OM 1490 and AS 996 was 108 days, about 12 days earlier than BR24; all other varieties had almost similar growth duration as in BR24. Water productivity under rainfed environment was slightly higher than supplemental irrigated treatments and all the Vietnam rice varieties had higher water productivity than BR24. The highest and lowest water productivity was obtained in OM 1490 and BR24, respectively. Therefore, OM 1490 is the most promising aus rice for the coastal region of Bangladesh, which could be easily fitted in Aus-Aman cropping pattern to improve the productivity of this region by utilizing available coastal water resources.

Knowledge Management: Report/Proceedings