Abstract
(1) Growth of Trifolium repens in acidic colliery spoil was suppressed by more than 90% when agricultural ground calcitic limestone was applied at above 5 t ha-l whereas Lolium perenne was unaffected at rates up to o00 t ha-'. (2) The inhibitory effect of ground limestone on T. repens was reduced by high phosphorus fertilization and disappeared within 34 weeks of treatment. (3) There was some evidence that high liming caused an imbalance of the Ca/Mg ratio in freshly limed spoil, contributing to growth inhibition. (4) Growth of L. perenne was improved and the inhibitory effect on T. repens was alleviated by substituting magnesian limestone (dolomite) for calcitic limestone. (5) Phosphate adsorption of spoil was similar after low and very high limestone applications but increased by 100% after liming at 25 t ha-' to pH 5. 1. (6) It is suggested that phosphate adsorption at pH 5.1 is caused by freshly precipitated, amorphous aluminium hydroxide. (7) The practical implications of the results are discussed.
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