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to a depth greater than 50 cm (20 in) as compared to ordinary plowing which rarely exceeds 20 cm (8 in). The purpose of deep plowing is to modify the soil water retention characteristics over the long term. In one long-term test, lasting 35 years, the mean annual
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yield was 2,800 lbs per acre (3,138 kg per ha) with deep plowing, which was 10% greater than the 2,550 lbs per acre (2,858 kg per ha) yield in unplowed plots.
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Baumhardt, R.L.; Jones, O.; Schwartz, R.C. (2008). "Long term effects of profile-modifying deep plowing on soil properties and crop yield".
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There is a movement away from plowing altogether and from deep plowing in particular. The theory is that this will stop the
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Under certain conditions, it is recommended to use deep plowing in preparing the soil for planting new
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would be conserved; but this was shown to be incorrect by a 35-year study.
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into rivers. Another part of the no-plowing theory is that
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230:"Deep Plowing Is Halted By Many to Protect Soil"
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