TIIE EVALUATIQN OF THE RESIDUAL EFFECT OF PHOSPHATE ON PERMANENT PASTURES

Phosphatic fertilisers applied over a period exert an effect which may last for a considerable time, depending on the amount of fertiliser used and the soil type. Thus, for instance, at Hoosfield, England, phosphatic fertilisers applied before 1911 continued to exert a marked influence as late as 1949. In field trials on a farm in Seine et Oise, France, phosphates applied before the Second World War, in excess of removals, have shown an after-effect up till 1952.