Hamdi, Y.A. <br/><br/>
Application of nitrogen-fixing systems in soil improvement and management 
by Y.A. Hamdi 
 - Rome  Food and Agriculture Organization of the United Nations  1982 
 - xiii, 188 p.  ill. 
 - FAO soils bulletin  49 .
<br/><br/> On t.p.: Soil Resources, Management and Conservation Service, Land and Water Development Division 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Organic fertilizers<br/>Nitrogen fertilizers<br/>Soils--Nitrogen content