Discussion
Which of the following best explains why cleaning grain before storage is worthwhile?
Answer: D
Correct answer: Fines spoil first and impede airflow
Fines, dust, weed seeds and broken kernels are the most vulnerable material in the store: damaged and metabolically active, they carry a disproportionate share of the moisture, mould spores and insect eggs, and they spoil first, seeding trouble in the sound grain around them. They also pack into the spaces between whole kernels, raising the resistance to airflow and creating pockets aeration cannot reach.
Cleaning does not itself lower the moisture content of the sound grain, nor does it kill insects, and any change in bulk density is incidental.
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