EFFECT OF 20-20-15 + TE RATE FERTILIZER ON LETTUCE ( Lactuca sativa L) Under SAND LOAM CONDITION ,ឥទ្ធិពលកម្រិតជិ ២០-២០​-១៥+TE លើដំណាំសាលាដក្នុងលក្ខលណ្ឌដិល្បាយខ្សាច់​ THORN THEIT,​ថត​ ថេត PHNOM PENH RUA 2019 2019 Text vii.40p. https://drive.google.com/file/d/1O0_HiMREEVNUmlKeA_Z3F7vFlOe1BcEy/view?usp=sharing