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Rice is a hygroscopic grain which adsorbs or desorbs moisture depending on its ambient environment. Moisture desorption is associated with rice drying. Much research has been conducted to determine those drying procedures which produce the highest head rice yield. Moisture adsorption is associated with water reentering the rice grain. This occurs when the vapor pressure within the grain is lower than the vapor pressure in the surrounding air. Rapid moisture readsorption causes the rice grain to fissure. Fissured grains usually break during subsequent hulling and milling operations. This paper reviews the literature related to moisture adsorption and fissuring of the rice grain, and discusses those preharvest and postharvest conditions where rice grains are subjected to moisture‐adsorbing environments which have the potential to fissure the grain and subsequently reduce head rice yield.

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