An Explanatory Model of Red Lentil Seed Coat Colour to Manage Degradation in Quality during Storage

This study presents an explanatory biophysical model developed and validated to simulate seed coat colour traits including CIE L*, a*, and b* changes over time for stored lentil cultivars PBA Hallmark, PBA Hurricane, PBA Bolt, and PBA Jumbo2 under diverse storage conditions. The model showed robust performance for all cultivars, with R2 values >= 0.89 and RMSE values <= 0.0019 for all seed coat colour traits. Laboratory validation at 35 degrees C demonstrated a high agreement (Lin's Concordance Correlation Coefficient, CCC >= 0.82) between simulated and observed values of all colour traits for PBA Jumbo2 and strong agreement (CCC >= 0.81) for PBA Hallmark in brightness (CIE L*) and redness (CIE a*), but not in yellowness (CIE b*). At 15 degrees C, both cultivars exhibited moderate to weak agreement between simulated and observed values of all colour traits (CCC <= 0.47), as very little change was recorded in the observed values over the 360 days of storage. Bulk storage system validation for PBA Hallmark showed moderate performance (CCC >= 0.46) between simulated and observed values of all colour traits. Modelling to simulate changes in seed coat colour traits of lentils over time will equip growers and traders to make informed managerial decisions when storing lentils for long periods.