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1521. Davies, D.B.. 1977. Soil management. 3rd edition.. Farming Press Ltd., Suffolk..
Soil compaction increased chances of root disease (take-all, foot rot); problems of loss of soil structure; leads to reduced fertilizer use efficiency, especially N & P; winter cereals less sensitive to poor structure than spring cereals; 2-3 yr grass/alfalfa stand helps restore structure; benifits of subsoiling on silt soils; best time is when soil is dry.