Salting and plough: what they have in common

1. Step 1. Salting — uses — Chemical reaction. Salt draws out water, suppressing microbes.
2. Step 2. Chemical reaction — includes — Catalysis. Speeding up a reaction.
3. Step 3. Catalysis — is used in — Sulfuric acid. The contact process on a catalyst.
4. Step 4. Sulfuric acid — is used in — Mineral fertilizer. Superphosphate is made with sulfuric acid.
5. Step 5. Mineral fertilizer — evolved from — Crop rotation. Fertilizers solved the problem of fertility that crop rotation used to solve.
6. Step 6. Crop rotation — uses — Plough. The three-field system with a heavy plough.

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