KARUKU, George Njomo; MOCHOGE, Benson O. Nitrogen forms in three Kenyan soils Andosols, Lucidols and Ferralsols. International Journal for Innovation Education and Research, Dhaka, Bangladesh, v. 4, n. 10, p. 17–30, 2016. DOI: 10.31686/ijier.vol4.iss10.594. Disponível em: https://scholarsjournal.net/index.php/ijier/article/view/594.. Acesso em: 4 apr. 2025.