00294nam a2200109Ia 450000500170000000800410001708200150005810000210007324500420009426000400013630000080017620260224041033.0260224s9999||||xx |||||||||||||| ||und||  a631.85 KHA  aKhasawneh, F.E.  4aThe role of phosphorus in agriculture  aAmerican: Society of Agronomyc1980  a910