Effect of usage cover on Chinese green yields in phnom vor farm, ឥទ្ធិពលនៃការប្រើប្រាស់គម្របលើដំណាំស្ពៃចង្កឹះនៅកសិដ្ឋានភ្នំវល្លិ៍ HUTH, NYMOL. GRS HUT 2010 B370 Or.1 Phnom Penh RUA 2010 2010 Text vii; 28p. https://drive.google.com/file/d/1up2XN7trHHJs_bGPaMhi-E7Ma7TI7s6f/view?usp=sharing