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Modelling the Incidence of Stress Cracking During Postharvest Drying of Maize

Kim, THa, MacKay, BRb, Opara, LUa, Hampton JGc, Hardacre AKd

Institute of Technology and Engineering, Massey University, Palmerston North Institute of Natural Resources, Massey University, Palmerston North NZ Seed Technology Institute, Lincoln University, Lincoln Crop & Food Research Institute, Palmerston North

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Modelling the Incidence of Stress Cracking During Postharvest Drying of Maize

Accurate prediction of the chronological development of cracking under various drying conditions will assist the development of appropriate strategies for reducing the incidence of cracking at minimum cost . Morgan - Mercer - Flodin ( MMF ) models accurately predicted the development of stress cracking during postharvest drying of soft and hard maize hybrids . Significant differences were detected in the rate of increases in checking and the extent of checked stress cracking among different maize hybrids and grain size / shape categories . Within grain size / shape categories, checked stress cracking developed to a greater extent and faster in small and rounded grains than large and flat grains . However, a significant reduction of stress cracking in maize grain after tempering and slow cooling following high temperature drying was found indicating that post drying treatment of grains strongly influenced the severity of stress cracking .