Abstract
Pulse nuclear magnetic resonance (NMR) was evaluated for usefulness
for moisture content measurement in wheat, corn, soybeans, pecans
and peanuts. The free induction decay (FID) and in some cases, spin-echo
(SE) outputs were used. Moisture content affected the shape of the
FID curve, particularly with wheat, corn and soybeans. Relationships
between moisture and NMR variables describing FID shape resulted
in coefficients of determination ranging from 0�8 to 0�97 for wheat,
corn and soybeans. The relatively high oil content of peanuts and
pecans probably reduced the FID shape sensitivity to moisture content.
Additional studies on peanuts by SE and FID data analysis gave coefficients
of determination ranging from 0�8 to 0�9. NMR may be useful for detecting
high-moisture kernels or aliquots within batches of grains but appropriate
hardware is needed to provide adequate throughput. � 1992 Silsoe
Research Institute.
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