effect of plant spacing on growth and yield of pok choy university of agriculture dry season condition ឥទ្ធពលចន្លោះគុម្ពលើការលូតលាស់និងទិន្នផលដំណាំស្ពៃតឿក្រោមលក្ខខណ្ឌរដូវប្រាំង PHOUNG VANNY ភួង វណ្ណី AGR PHO 2017 B636 Or.1 RUA Phnom penh 2017 2017 Text ix;36p https://drive.google.com/file/d/1Q-nIkFEp5UfNWeysc_1_vvU3ESa8iMiv/view?usp=sharing