Research Article
Zinc Soil Test Calibration Based on 0.1 N HCl Extractable Zinc and Cation Exchange Capacity from Upland Soils of Northern Nigeria
Department of Soil Science, Ahmadu Bello University, Zaria, Nigeria
A. A. Yusuf
Department of Soil Science, Ahmadu Bello University, Zaria, Nigeria
A. Abdulkadir
Department of Soil Science, Ahmadu Bello University, Zaria, Nigeria
U. L. Arunah
Department of Agronomy, Faculty of Agriculture, Ahmadu Bello University, Zaria, Nigeria
V.O. Chude
National Special Programme on Food Security, Food and Agricultural Organization (FAO), Abuja, Nigeria
S. G. Pam
Crop Production Programme, School of Agriculture, Abubakar Tafawa Balewa University, Bauchi, Nigeria