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Without their aid most manures would be useless for plant growth.
Compost or animal manures offer other natural approaches toward improving soil quality.
The term coprolites has been made to include all kinds of phosphatic nodules employed as manures, such, for example, as those obtained from the Coralline and the Red Crag of Suffolk.
The industries comprise the manufacture of chemicals and artificial manures, granite polishing, flour and sawmills, bootand shoe-making, carriagebuilding and woollen manufactures.
Besides quarrying, the industries include granitepolishing, concrete (crushed granite) works, dye-works, papermills and artificial manures.