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Spatial and temporal trends of water productivity in the lower Mekong River Basin

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  • Mainuddin, Mohammed
  • Kirby, Mac

Abstract

We estimate the physical and economic water productivities of rice and upland crops grown in the Lower Mekong River Basin and we examine their spatial and temporal trends. We discuss the constraints to low productivity, suggest measures for improvement and show the future productivity requirements for food security for increased population. Both the physical and economic water productivities of rice are higher in Vietnam, moderate in Laos, and lower in Thailand and Cambodia. In contrast, the physical water productivities of upland crops such as sugarcane and maize are highest in Thailand. The economic water productivity of upland crops is higher in Laos followed by Vietnam, Cambodia and Thailand, and is much higher than that of rice. However, the economic productivity of all crops is dominated by the productivity of rice, particularly lowland rainfed rice, which is the dominant crop in the Lower Basin. The intra-regional variation (among the provinces within a country) of productivity is not substantial. There is an increasing trend of both physical and economic water productivity in all four riparian countries; however, the increase is more prominent in Laos and Vietnam. The economic productivity of upland crops is much higher than that of rice and therefore cultivation of more upland crops can significantly increase farm-level incomes, with positive impacts on reducing poverty. Increasing upland crops areas is unlikely to have any impact on the food security of the basin. The current rate of increase of both production and productivity of rice is considerably greater than the rate required to feed the expected extra population by 2050, suggesting that food security is not threatened by the population increase. There appears to be considerable scope to increase productivity and maintain the export potential of the basin.

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  • Mainuddin, Mohammed & Kirby, Mac, 2009. "Spatial and temporal trends of water productivity in the lower Mekong River Basin," Agricultural Water Management, Elsevier, vol. 96(11), pages 1567-1578, November.
    • Handle: RePEc:eee:agiwat:v:96:y:2009:i:11:p:1567-1578
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    3. Christopher Wokker & Paulo Santos & Ros Bansok, 2014. "Irrigation water productivity in Cambodian rice systems," Agricultural Economics, International Association of Agricultural Economists, vol. 45(4), pages 421-430, July.
    4. Monjardino, M. & Philp, J.N.M. & Kuehne, G. & Phimphachanhvongsod, V. & Sihathep, V. & Denton, M.D., 2020. "Quantifying the value of adopting a post-rice legume crop to intensify mixed smallholder farms in Southeast Asia," Agricultural Systems, Elsevier, vol. 177(C).
    5. Mainuddin, M. & Hoanh, Chu Thai & Jirayoot, K. & Halls, A. S. & Kirby, M. & Lacombe, Guillaume & Srinetr, V., 2010. "Adaptation options to reduce the vulnerability of Mekong water resources, food security and the environment to impacts of development and climate change. Report to AusAID," IWMI Research Reports H043268, International Water Management Institute.

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