Effect of Phosphate Residues on Soil P Values and Crop Yields I. Experiments on Barley, Potatoes and Sugar Beet on Sandy Loam Soils at Woburn, A. E. JOHNSTON, G. E. G. MATTINGLY and P. R. POULTON (1976) Rothamsted Experimental Station Report for 1975 Part 2 - pp 5 - 35