Soil fertility manual :  to understand soil fertility is to understand a big key to mankind's survival on this planet. 

 - Atlanta :  Potash and Phosphate Institute,  1979. 
 - 88 p. :  ill. ;  29 cm. 
<br/><br/> Open access. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soil fertility.