Mapping Post-Harvest Waste in Perishable Supply Chains through System Dynamics: A Sri Lankan Case Study

Abstract

Purpose : This research focuses on gaining insights on post-harvest waste. It is based on the upstream traditional vegetable and fruit supply chains in Sri Lanka and hopes to provide a basic understanding for future research. The research focuses on Thambuththegama and Nuwara Eliya dedicated economic centers which were established to collect vegetables directly from farmers. Research Method : Novel methods such as value stream mapping and system dynamics were used to map the supply chain and post-harvest waste for the first time in Sri Lanka. Value stream mapping was used to identify value-adding and nonvalue-adding activities. From the knowledge gained through literature and industry inputs a causal loop diagram was drafted. Findings : The causal loop diagrams show that lack of communication platforms, poor practices in handling vegetables, weather conditions and the number of intermediaries affect more towards postharvest waste. To reduce post-harvest waste, the government should invest more in awareness programs for the actors in the supply chain and relevant infrastructure. The research finds that inability to control the transpiration and respiration process of the harvested vegetables, unawareness of the issues among the value chain actors and operational inefficiencies are the main causes for post-harvest waste. Value : Future researchers can base the drafted causal loop diagram and develop a simulation model to increase operational efficiency and reduce post-harvest waste in the system.