One of the mysteries of the English language finally explained.
A compacted layer in cultivated soil resulting from repeated ploughing.
- ‘The decline in cotton yields in the Sudan, has been partially attributed to deterioration in soil physical properties and the formation of a plough pan 20 cm deep as a result of the repeated use of the disc plough for land preparation.’
- ‘Plough pans are caused by the smearing action of disc ploughs continually operating at the same depth over a long period.’
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