de A. Machado, P.L.O. <br/><br/>
Tillage and crop rotation interactions on humic substances of a typic haplorthox from southern Brazil. 

 - Seibersdorf :  Forschungszentrum Seibersdorf,  1993. 
 - 236 p. 
<br/><br/><label>ISSN: </label>0253-5270 
<br/><br/><label>Standard No.: </label>OEFZS-4693