Research Article
Qualitative and Quantitative Evaluation of Four Organic Materials as Nutrient Resources for Maize in the Nigerian Savanna
Department of Soil Science, Institute For Agricultural Research, National Agricultural Extension Research and Liaison Services, Ahmadu Bello University, Zaria, Nigeria
E. Uyovbisere
Department of Soil Science, Institute For Agricultural Research, Ahmadu Bello University, Zaria, Nigeria
I. Y. Amapu
Department of Soil Science, Institute For Agricultural Research, Ahmadu Bello University, Zaria, Nigeria
J. E. Onyibe
National Agricultural Extension Research and Liaison Services, Ahmadu Bello University, Zaria, Nigeria