Tusdri, S., Pachanawan, N., Bumrung, N. and Jengnay, Y. (1999) “Productivity and Quality of CP- Pangola (Digitaria decumbents cv. CP-1) Under Different Managements IV. Sources and Methods of Nitrogen Application”, Agriculture and Natural Resources. Bangkok, Thailand, 33(4), pp. 515–521. available at: https://li01.tci-thaijo.org/index.php/anres/article/view/240404 (accessed: 17 September 2026).