@ARTICLE {JUO:1973, title = {Hydrolysis and availability of pyrophosphate in tropical soils}, author = {Juo, A. S. R. and Maduakor, H. O. }, journal = {Soil Science Society of America Journal}, year = {1973}, volume = {37}, number = {2}, pages = {240--242}, doi = {10.2136/sssaj1973.03615995003700020024x}, }