Reducing Ammonia Loss from Urea by Mixing with Humic and Fulvic Acids Isolated from Coal

Ameera Abdul Reeza, Osumanu Haruna Ahmed, Nik Muhamad Nik Ab. Majid and Mohamadu Boyie Jalloh

American Journal of Environmental Sciences 5 ( 3 ): 420 - 426 , 2009