Discussion
Final moisture spread through a deep bed at three depths.
| Bed depth (m) | Bottom moisture (per cent) | Top moisture (per cent) | Spread |
|---|---|---|---|
| 0.4 | 13.0 | 14.6 | 1.6 |
| 0.8 | 12.4 | 16.8 | 4.4 |
| 1.2 | 11.8 | 19.1 | 7.3 |
| 1.6 | 11.2 | 21.0 | 9.8 |
What does the table demonstrate about deep bed drying?
Answer: A
Correct answer: Moisture spread grows rapidly with depth
The spread column tells the story directly: \( 1.6 \) points at \( 0.4 \) m, but \( 9.8 \) points at \( 1.6 \) m - a sixfold increase for a fourfold increase in depth, so the growth is more than proportional. The cause is that air gives up heat and takes up moisture as it rises, arriving at the upper layers nearly spent.
The bottom in fact dries most, falling from \( 13.0 \) to \( 11.2 \) per cent as the bed deepens and the drying time lengthens, while the top is left wetter and wetter. This is precisely why deep beds are limited in depth or the grain is recirculated.
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