Effect of nitrogen on growth and yield of soya bean varieties in wet season ; ឥទ្ធិពលអាសូតទៅលើការលូតលាស់ និងទិន្នផលប្រភេទពូជសណ្ដែកសៀង នៅរដូវវស្សា KEO KIMHONG; កែវ​ គឹមហុង MGR KEO 2009 B400 Or.1 Phnom Penh RUA 2009 2009 Text xiii; 65p. https://drive.google.com/file/d/1aFa197pGHVrnvJJ8IVNsPuh7JS3TxDzR/view?usp=sharing