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.
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