Estimation of potential area of preparatory irrigation for rainy season lowland rice and supplemental irrigation for dry season cropping using existing reservoirs constructed for aquaculture: a case study in semi-mountainous village, Lao PDR

  • Toshihiko AnzaiEmail author
  • Hiroshi Ikeura
  • Amphone Chomxaythong
  • Khaykeo Keokhamphui
  • Somphone Inkhamseng


The rural area in Lao PDR has a low yield of rainy season lowland rice, and most rice fields are not utilized for crop cultivation during the dry season. Delay in transplanting owing to late field ponding is considered the cause for the low yield of rainy season lowland rice. Reservoirs for aquaculture are located in the upper part of fields; however, stored water is not efficiently utilized. In this study, a potential area of preparatory irrigation for early field ponding (APIR) and supplemental irrigation for dry season cropping (ASID), using existing reservoirs, was estimated in two basins in the semi-mountainous village of Lao PDR. Estimated water withdrawal was calculated considering water balance in four cases of water management in reservoirs, considering aquaculture cultivation period and timing of the drainage operation. Water requirements for early field ponding and soybean, a candidate crop for dry season cropping, and conveyance efficiency were calculated using hydrological approaches. Results show APIR in each basin was 4.1 ha and 8.6 ha under current water management in a low-yield rice field area of 7.8 ha and 6.3 ha, respectively. ASID in each basin was 2.1 ha and 1.1 ha, respectively, under current water management. Although APIR and ASID increased under closed aquaculture, the impact was negligible. ASID increased when the drainage operation shifted to the final timing of supplemental irrigation. This water management approach was recommended for both types of irrigation considering improved agricultural productivity obtained through more efficient use of stored water, with aquaculture maintained.


Potential irrigation area Rainy season lowland rice Dry season cropping Water requirement of preparatory irrigation Possible water withdrawal Agricultural water use 



This study was the partial result of the collaborative research project between the Japan International Research Center for Agricultural Sciences, National University of Laos, and National Agriculture and Forestry Research Institute. The authors thank Dr. Kenichiro Kimura who provided the catchment area and elevation data of the study area. The authors express our sincere appreciation to the Agriculture and Forestry offices of Vientiane province and Feuang district, and the people in N Village.


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Copyright information

© The International Society of Paddy and Water Environment Engineering 2019

Authors and Affiliations

  1. 1.Rural Development DivisionJapan International Research Center for Agricultural SciencesTsukubaJapan
  2. 2.Faculty of Water ResourcesNational University of LaosVientianeLao PDR

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