effect of different plant spacing of rice sen pidor ឥទ្ធពលនៃចន្លោះគម្អផ្សេងៗគ្នានៅលើដំណាំស្រូវសែនពិដោរ HANG SOKRITH ហង​ សុខរិទ្ធ creator text phnom penh RUA 2017 monographic ix;29p ill; 29cm AGR HAN 2017 B633 Or.1 https://drive.google.com/file/d/1W33YNVCsPqxYemibACT-6yoKvDoKNwDS/view?usp=sharing https://drive.google.com/file/d/1W33YNVCsPqxYemibACT-6yoKvDoKNwDS/view?usp=sharing