A. E. JOHNSTON, G. E. G. MATTINGLY and P. R. POULTON (1976) 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 in : Rothamsted Experimental Station Report for 1975 Part 2 - pp 5 - 35