1 23 Plant and Soil An International Journal on Plant-Soil Relationships ISSN 0032-079X Plant Soil DOI 10.1007/s11104-012-1419-9 Biological nitrification inhibition (BNI) activity in sorghum and its characterization G. V. Subbarao, K. Nakahara, T. Ishikawa, H. Ono, M. Yoshida, T. Yoshihashi, Yiyong Zhu, H. A. K. M. Zakir, S. P. Deshpande, et al.