Orohgan, Joaquin C. <br/><br/>
Yield response of two sweet potato cultivars to different levels of nitrogen-potassium fertilizer under different management practices / 
Joaquin C. Orongan. 
 - Los Ba�os, Laguna,  Cavite State University- Main Campus,  1979. 
 - 81p. : ill. ; 28 cm.  illustrations ;      cm. 
<br/><br/> Thesis (M.S.--Agronomy) University of the Philippines 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sweet potatoes<br/>Fertilizers and manures
<br/><br/><label>Dewey Class. No.: </label>635.22   / Or6 1979