Nnachi, S.U., Sawa, B.A., Ikpe, E., Philemon, A.C. and Balogun, S.E. 2016. Comparison in Trend Analysis of Annual Rainfall Variability on Grain Yield Pattern in Gusau Station, Zamfara State, Nigeria. International Journal of Science for Global Sustainability. 2, 1 (Mar. 2016), 12.