Beaufils, E. R. <br/><br/>
Diagnosis and recommendation integrated system (DRIS) 

 - Pietermaritzburg, Natal :  University of Natal. Department of Soil Science,  1973 
 - 132 p.  ; gráfs. 
 - Soil science bulletin  ; 1 .
 - Soil science bulletin  ; 1 .
<br/><br/><label>LCCN: </label>13484 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Diagnóstico foliar.<br/>Método DRIS.<br/>Plantas--Elementos minerales.<br/>Plantas--Nutrición.