Discussion
Assertion (A): Maize is shelled at around sixteen to eighteen per cent moisture rather than much drier.
Reason (R): Very dry kernels crack readily under the shearing action of the rotor.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the reason explains the practice. Very dry kernels are brittle, and the shearing action that frees them from the cob cracks them - damage reaches about 6 per cent at 12 per cent moisture against 2.4 per cent at 16.
There is a limit at the other end too: above about 20 per cent the kernels are soft and cling to the cob, so shelling percentage falls away. The window between is where both figures are acceptable, which is why maize is dried to it rather than past it.
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