Research Article
Content and Distribution of Nitrogen Forms in Some Black Cotton Soils in Akko LGA, Gombe State, Nigeria
Crop Production Programme, Abubakar Tafawa Balewa University, Bauchi, Nigeria
N. Voncir
Crop Production Programme, Abubakar Tafawa Balewa University, Bauchi, Nigeria
S. Umar
Crop Production Programme, Abubakar Tafawa Balewa University, Bauchi, Nigeria