Managing Fertilizers to Enhance Soil Health Bijay Singh and John Ryan ❙ 1 © Gwoeii Managing Fertilizers to Enhance Soil Health Bijay Singh and John Ryan First edition, IFA, Paris, France, May 2015 Copyright 2015 IFA. All rights reserved The publication can be downloaded from IFA’s website www.fertilizer.org/Library ABOUT THE AUTHORS John Ryan Bijay Singh Consultant Soil Scientist, Carrigataha, Cahir, Tipperary, Punjab Agricultural University, Ludhiana 141 004, Punjab, Ireland –
[email protected] India –
[email protected] Dr John Ryan, researcher, educator, and editor, has Dr. Bijay Singh is INSA Senior Scientist at Punjab degrees from University College Dublin ( PhD, D.Sc) and Agricultural University, Ludhiana, India. He is a fellow is currently a consultant in Ireland. He spent 37 years of the Indian National Science Academy and National in the Middle East as Senior Scientist at ICARDA in Syria, Academy of Agricultural Sciences, and was one of the Professor of Agronomy with the University of Nebraska ten National Professors in India during 2006 to 2012. in Morocco and Professor of Soil Science at the American His contributions on nitrogen balance in soil plant University of Beirut, and previously at the University of systems have led to better understanding for enhancing Arizona. His main area of interest is dryland soil fertility nitrogen use efficiency in rice-wheat cropping system and plant nutrition. He is a Fellow of ASA, SSSA, CSSA, and reducing fertilizer nitrogen related environmental and AAAS, and is recipient of the International Awards in pollution. His work on nitrogen management in rice and ASA, SSSA, and CSSA, Distinguished Soil Science Award, wheat using leaf color chart is proving very useful in IFA Crop Nutrition Award, IPNI Science Award, J.Benton enhancing fertilizer use efficiency in South Asia.