Leong, Ah Chye <br/><br/>
Nitrogen and potassium requirements of chinese cabbage (Brassica rapa L.) on oligotrophic peat  [article] / 
A.C. Leong, H. Salbiah 
 - Kuala Lumpur :  MARDI,  2002 
<br/><br/> PTSL : K.Dokumen