Correlation of head rice yield to selected physical and mechanical properties of rice kernels
1995
Lu, R. | Siebenmorgen, T.J.
Compression and three-point bending tests were conducted to determine the maximum compressive force and bending force to crush rough, brown, and white rice of the long-grain variety 'Lemont'; and the bending force to break rough rice of the long-grain variety 'Tebonnet'. Correlations between head rice yield and the average maximum compressive force to crush/break rough, brown, and white rice of the 'Lemont' variety were either insignificant or of a low order of magnitude. There was a highly significant correlation between head rice yield and the average bending force to break rough rice (r = 0.979 for 'Lemont', and 0.932 for 'Tebonnet'). Although significant, lower correlation coefficients were found for the 'Lemont' brown and white rice (r = 0.920 and 0.787, respectively). The percentage of broken kernels from milling was closely related to the percentage of kernels which did not sustain approximately 15 N breaking force in bending. Predicted head rice yields from the bending test results compared well with the head rice yields from milling with an overall average prediction error of 2.1 percentage points for 'Lemont' and 3.3 percentage points for 'Tebonnet'. Required breaking force was significantly correlated to kernel thickness for rice harvested at high moisture content, but not for rice harvested at low moisture content. Thinner kernels generally failed at a lower breaking force and were in turn more susceptible to breakage during milling.
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