The philippines recommends for soil fertility management. 

 - Los Banos, Laguna :  PCARRD,  c1999. 
 - 201 p. :  ill. ;  23 cm. 
<br/><br/> (Phil. Recommends Series No. 36-C.  References: p. 111-112. 
<br/><br/><label>ISBN: </label>9712004570 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soil fertility.