How to cite this article:
S. Mustapha, N. Voncir and S. Umar, 2011. Content and Distribution of Nitrogen Forms in Some Black Cotton Soils in Akko LGA, Gombe State, Nigeria. International Journal of Soil Science, 6: 275-281.
DOI: 10.3923/ijss.2011.275.281
URL: https://scialert.net/abstract/?doi=ijss.2011.275.281
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