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Nutrient Management for Rice in the Flood-prone Ecosystem

G.M. Panaullah
Soil Science Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh

M.S. Rahman
Soil Science Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh

A.L. Shah
Soil Science Division, Bangladesh Rice Research Institute, Gazipur, Bangladesh

Abstract/ Executive Summary:

Bangladesh has a complex web of agroecosystems that determine the nature and scope of agricultural enterprises in the country. Almost every year, floods cause colossal damage, but the farmers are usually blessed with relatively rich harvests following a flood. This is largely believed due to enrichment of soils with plant nutrients carried by floodwater. Each year, a major portion of about 2.5 billion tons of nutrient-rich sediments carried by the major river systems is deposited on crop fields. In this paper, we review and analyze available data on nutrient addition to soils from floodwater that could affect soil fertility in the flood-prone ecosystem, and present results of some recent research by BRRI soil scientists on nutrient management for rice in the flood-prone ecosystem. Studies suggested that the sediments contained good amounts of organic matter and substantial amounts of N, P, K, S, Ca, Mg, Fe, Mn, Zn, and B. Nitrogen was found to be the only possible limiting nutrient for rice production in flood-prone areas. Fertilizer recommendations for the different rice-based cropping systems in the flood-prone ecosystem should be based on regular sediment and soil tests to avoid over application of fertilizer. Such a fertilization practice will be both cost-effective for farmers and environment-friendly. New N fertilizer management techniques, such as the leaf color chart and the use of urea super granules and slow-release fertilizers, appeared to be promising for the flood-prone ecosystem.

Keywords: Nutrient management, Rice, Flood-prone ecosystem

Location: BRRI, Gazipur

Start Date:

End Date:

Program Area: Quality and Nutrition

Commodity: Soil fertility, Rice

Objectives:

To review and analyze available data on nutrient addition to soils from floodwater affected in the flood-prone ecosystem, and
To know the experience of BRRI soil scientists on nutrient management for rice cultivation in the flood-prone ecosystem.

Methodology:

The article is based on primary data; data were collected from BRRI Gazipur and secondary data were collected from different sources, eg., BRRI, IFDC, journals, books, annual report, etc. Data covering by 1992 to 2000 to fulfill the objectives. Potential plant nutrient of N, P, K, s, cA, Mg, Fe, Mn, Zn, AND B was determined in floodwater sediment.

Source of Information: Rice research and development in the flood-prone ecosystem (2004). Proceedings of the international workshop on flood-prone rice systems held in Gazipur, Bangladesh, 9-11 January 2001. Los Banos (Philoppines): International Rice Research Institute, p: 225-235.

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Sediment carried by floodwater is rich in plant nutrients, which can improve soil fertility in the flood-prone ecosystem. Annual replenishment of the soils with plant nutrients in flooded areas should be helpful in maintaining a positive nutrient balance in the soils and ensuring the sustainability of the cropping systems. Fertilizer recommendations for the different rice-based cropping systems in the flood-prone ecosystem should be based on regular sediment and soil tests to avoid over application of fertilizer. Such a fertilization practice will not only be cost effective for farmers but will also be environment-friendly. New N fertilizer management techniques, such as the LCC (leaf color chart) and the use of USG (urea super granules) and slow-release fertilizers, etc., appear promising for the flood-prone ecosystem.

Knowledge Management: Report/Proceedings