PET BONA,ប៉ែត​​ បូណា <br/><br/>
EFFECT OF PLANTING DENSITY ON GROWTH AND YIELD ON BOK CHOY (BRASSICA RAPA CHINENSIS L.) IN ROYAL UNIVERSITY OF AGRICULTURE 

 - PHNOM PENH   RUA   2019  
 - vi,28p.  ill,  29cm,