Portch, Sam <br/><br/>
Systematic approach to soil fertility evaluation and improvement 

 - Hong Kong:   Canpotex Limited,   2003 
 - 62p. 
 - China program  5 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture 
<br/><br/><label>Subjects--Index Terms: </label>Harvesting Soil sample 
<br/><br/><label>Universal Decimal Class. No.: </label>631.45  / P3