Statistics of crop response to fertilizers 

 - Rome ,    1966 
 - viii, 112 p.:    ill., tables, diagr;    23 cm 
<br/><br/>Bibliography : (p. [66]) 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Fertilizers and manures -- Mathematical models<br/> Fertilizers and manures -- Economic aspects