Discussion
Arrange these storage measures in order of increasing cost per tonne:
1. Traditional farm structure
2. Aerated bulk silo
3. Controlled atmosphere store
4. Refrigerated cold store
Select the correct sequence.
Answer: C
Correct answer: 1, 2, 3, 4
Cost per tonne rises with the sophistication of the environmental control. A traditional farm structure (1) is cheapest, built of local materials and needing no power. An aerated bulk silo (2) adds a structure, a fan and a plenum but only a small electrical load.
A controlled atmosphere store (3) needs a gas-tight envelope with generators, scrubbers and instrumentation, and a refrigerated cold store (4) adds a complete refrigeration plant with a continuous and substantial energy demand. Each step is justified only by a commodity whose value can bear it.
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