Abstract
The macro-structure of the surface layer of a self-mulching clay was quantified statistically using methods described previously by the senior author. Soil macro-structures were determined at the 10, 20 and 40 mm depths in the 34th year of a long-term trial with two methods of cereal stubble management (burning and incorporation) and in the 1st year of a new trial with two methods of cereal stubble management (burning and retention) and two methods of weed control (herbicide and blade or sweep plough). Stubble management had only small and probably insignificant effects on soil macro-structure but mechanical weed control had a significant positive effect on soil macro-structure as compared to chemical weed control.
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