Effect of environment and variety on milling qualities of rice [Philippines]
1985
Kunze, O.R.
Fissured rice grains usually break during milling, thereby reducing head rice yield and milling quality. Low-moisture rice grains can fissure when subjected to a moisture-adsorbing environment. At harvest time, field samples of rice are used to determine grain moisture content. This moisture measurement implies that all grains are at the measured moisture, but the paddy may vary from dry grains at nearly storage moisture to wet grains still in the dough stage. Low-moisture grains may be subjected to high-moisture environments: (1) in the field before harvest, (2) in combine hopers or holding bins before the grain is dried, (3) in deep bed or column dryers where a drying front moves through the bed of grains, and (4) in storage, transport or milling facilities. Each rice variety has its own susceptibility to fissuring. Moisture stresses produced fissured grains more in bold varieties than in long-grain or long, slender-grain varieties. Different rice varieties may have similar grain configurations but may not be uniformly susceptible to fissured grains. Chemical compositions of rice varieties with similar grain configurations but with different fissuring susceptibilities need to be studied to determine if fissuring characteristics can be predicted from the chemical composition
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