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F. N. IKPE,
J. M. POWELL,
N. O. ISIRIMAH,
T. A. T. WAHUA
and E. M. NGODIGHA
(1999).
Effects of primary tillage and soil amendment practices on pearl millet yield and nutrient uptake in the Sahel of West Africa. Experimental Agriculture,
35
,
pp 437-448
doi:10.1017/S0014479799354053