Effect of different seedling age and hill spacing on phkarumdeng rice variety at royal university of agriculture ឥទ្ធិពលនៃចំនួនសន្ទូង និងអាយុសំណាបខុសៗគ្នាលើពូជស្រូវផ្ការំដេងនៅសាកលវិទ្យាល័យភូមិន្ទកសិកម្ម LIM, DY. AGR LIM 2009 B040 Or.1 Phnom Penh RUA 2009 2009 Text xii; 63p. https://drive.google.com/file/d/1QLoY7hcdBvg5jZB3YcfMt0k68RQp6vS0/view?usp=sharing