Best practices for paddy drying: case studies in Vietnam, Cambodia, Philippines, and Myanmar

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Best practices for paddy drying: case studies in Vietnam, Cambodia, Philippines, and Myanmar

guyen-Van-Hung,   Tran-Van-Tuan, Pyseth Meas, Caesar Joventino M. Tado, Myo Aung Kyaw & Martin Gummert

To cite this article:   Nguyen-Van-Hung,   Tran-Van-Tuan, Pyseth Meas, Caesar Joventino M. Tado, Myo Aung Kyaw & Martin Gummert (2018): Best practices for paddy drying: case studies in Vietnam, Cambodia, Philippines, and Myanmar, Plant Production Science, DOI: 10.1080/1343943X.2018.1543547 To link to this article:  https://doi.org/10.1080/1343943X.2018.1543547

ARTICLE HISTORY

 Received 16 June 2018

Revised 13 October 2018

Accepted 26 October 2018

Full Text PDF.

To link to this article:  https://doi.org/10.1080/1343943X.2018.1543547

Plant Production Science
ISSN: 1343-943X (Print) 1349-1008 (Online) Journal homepage: http://www.tandfonline.com/loi/tpps20

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ABSTRACT Our study made a comparative analysisofthe different drying practicesusedin Vietnam,Cambodia, the Philippines, and Myanmar. Quantification of energy efficiency, greenhouse gas (GHG) emissions, andcost-benefitsgeneratedtheimplicationsforselectingtheoptimaldryingpracticecorresponding to various techno-economic indicators, environments, scales of operations, and market demands. Usingareversibleairflow flatbeddryerwithacapacityof20tonsofpaddyperbatchwasfoundtobe the best option in terms of cost-bene fit, labor operation, and energy efficiency. On the other hand, a recirculating columnar dryer requires 15% higher energy consumption but only needs 20–50% of the floorarea;whileasolarbubbledryerstillneedsoptimizationintermsofreducedinvestmentcost and labor requirement. A two-stage drying system including a fluidized-bed and ten recirculating columnar dryers is an optimal option with the lowest drying cost and labor use when aiming at an industrial capacity of greater than 200 t/day. Nevertheless, the energy consumption and GHG emission of the solar bubble dryer are lower by more than 50% than that of other practices. In addition to the comparative analysis of these techno-economic factors, this research also identified the trajectories of developing paddy drying technologies that are aligned with different postharvest systems identified as subsistence farming for own consumption, surplus farming for local markets, and surplus farming for premium and export markets. The study recommends paddy drying strate- gies in Southeast Asian countries that could be applied in other rice-production regions as well.

Abbreviation: GHG: greenhouse gas

KEYWORDS Rice; postharvest; drying; best practices; life-cycle assessment