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1. During the drying process there is always variability in moisture content of individual grains.
2. Especially in fixed-bed dryers the grains at the air inlet dry faster than at the air outlet resulting in a moisture gradient in the grain bulk at the end of the drying process.
3. For production of good quality grain or seed, this variability should be kept as low as possible.
4. Frequent stirring in sun drying, grain turning in fixed bed dryers or circulation in re-circulating batch dryers will improve uniformity of drying, minimize the re-wetting of dried grains and thus maintain grain quality.