Effective on solution FeEDTA/FeEDDHA on the growth of bok choy by hydrophonics; ឥទ្ធិពលនៃអត្រាFeEDTA/FeEDDHA លើការលូតលាស់ដំណាំស្ពៃតឿដាំតាមបច្ចេកទេស PHEAC CHAMVIRAK; ភាវ ចមវីរៈ VEM PHE 2015 B522 Or.1 Phnom Penh RUA 2015 2015 Text x; 34p; EFFECTIVE ON SOLUTION FeEDTA/FeEDDHA ON THE GROWTH OF BOK CHOY BY HYDROPHONICS