Wijewardene, Ray <br/><br/>
Systems,techniques & tools conservation farming  for small farmers in the humid tropics 

 - Colombo  Marga publications 
 - v,38p.  29cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture and related technologies<br/>Conservation tillage<br/>Soil erosion<br/>Soil science<br/>Specific techniques
<br/><br/><label>Dewey Class. No.: </label>631.451  / WIJ