Soil and plant testing as a basis of fertilizer recomendations. 

 - Rome :  FAO 
 - vi, 100 p. ;  27 cm. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soil chemistry.<br/>Botanical chemistry.