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A STUDY OF HEAD RICE YIELD REDUCTION OF LONG- AND MEDIUM-GRAIN RICE VARIETIES IN RELATION TO VARIOUS HARVEST AND DRYING CONDITIONS

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Transactions of the ASAE.  VOL. 43(6): 1709-1714 . (doi: 10.13031/2013.3072) @2000
Authors:   J. Fan, T. J. Siebenmorgen, W. Yang
Keywords:   Head rice yield, Drying, Harvest moisture content, Rice variety

In this research, the effects of harvest moisture content (HMC), harvest location, variety difference, and heated-air drying conditions on head rice yield reduction (HRYR) of long-grain (Kaybonnet and Cypress) and medium-grain (Bengal) varieties were investigated. The rice was harvested at moisture contents (MCs) of approximately 16 to 26% from two locations (Stuttgart and Keiser, Arkansas). The rough rice was dried under three conditions: 43.5C, 38% relative humidity (RH), 9.5% equilibrium moisture content (EMC); 51.7C, 25% RH, 7.3% EMC; and 60C, 17% RH, 5.8% EMC. The results indicated that variety, HMC, drying condition, and drying duration had significant interactive effects on the HRYR during drying. Medium-grain Bengal rice exhibited more HRYR than did long-grain Cypress or Kaybonnet rice under a given drying condition. The results further indicated that a decrease in MC of rice at the early drying stages did not substantially affect the HRY until a certain MC level was reached. It appeared in this study that the amount of moisture that could be removed without affecting HRY increased as harvest MC increased.

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