EFFECT OF DIFFERENT NITROGEN ON GROWTH AND YIELD OF ROMAINE LETTUCE ឥទ្ធិពលនៃកម្រិតអាសូត លើការលូតលាស់​ និងទិន្នផលលើដំណាំំសាលាដ (ROMAINE) THORN THA ថន ថា AGR THO 2022 B1-490 Or. PHNOM PENH RUA 2022 2022 Text XI. 40P https://drive.google.com/file/d/1G1YjVO7f3uwTp5FmVNkbcMk9VZPbpWZW/view?usp=sharing