The techniques used in near infrared spectrophotometry for nondestructive analysis of agricultural products were applied to determine the percentage of dry matter (% DM) of intact onions ( Allium cepa L). Transmittance data were recorded for the 700 nm to 1000 nm spectral region. Second derivative data processing was used with a stepwise multiple regression analysis to develop an equation to predict the % DM of individual onions. The correlation between optical data and % DM was 0.996. In a 2nd and completely independent experiment, we obtained equivalent results demonstrating the repeatability of the method. This repeatability was demonstrated even further through the satisfactory field testing of a portable instrument.
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Birth et al. (1985) studied this question.