Bryan G. Hopkins is a Professor at Brigham Young University and a Certified Professional Soil Scientist. He is the Coordinator for the Soil Science Society of America--North American Proficiency Testing Program. He has degrees from Ricks College, Brigham Young University, and Kansas State University in Agronomy & Horticulture with specialties in soil biophysical chemistry and plant nutrition. He has published dozens of peer reviewed manuscripts and book chapters and hundreds of research reports and given countless presentations. Dr Asher Bar-Tal is a Senior Researcher at the Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO, the Volcani Center) of Israel. In 1987 he earned Ph.D. from The Hebrew University of Jerusalem. From 2011 to 2013 he served as the Chairman of the Department of Soil Chemistry, Plant Nutrition and Microbiology, Institute of Soil, Water and Environmental Sciences, The Volcani Center, ARO. Dr Bar-Tal currently serves as the president of the Israeli Society of Soil Science. His research interests focus on soil chemistry, plant nutrition and fertilization of crops.

• Chapter 1 - Spray technologies in precision agriculture: Paul Miller, Silsoe Spray Applications Unit Ltd, UK; 1 Introduction2 Features of field crop sprayers for precision agriculture3 Case study 1: designing and developing a system for spot treatment of volunteer potatoes4 Case study 2: a patch spraying system for applying herbicides to field crops5 Conclusion6 Future trends7 Where to look for further information8 References Chapter taken from: Stafford, J. (ed.), Precision agriculture for sustainability, Burleigh Dodds Science Publishing, Cambridge, UK, 2018, (ISBN 978 1 78676 204 7)Chapter 2 - Site-specific nutrient management systems: Dan S. Long, USDA-ARS, USA; 1 Introduction2 Processes to inform site-specific nutrient management3 Regional perspectives4 Conclusions and future trends5 Where to look for further information6 References Chapter taken from: Stafford, J. (ed.), Precision agriculture for sustainability, Burleigh Dodds Science Publishing, Cambridge, UK, 2018, (ISBN 978 1 78676 204 7)Chapter 3 - Developments in the use of fertilizers: Bryan G. Hopkins, Brigham Young University, USA; 1 Introduction2 Nutrient pollution and resource depletion3 Achieving more sustainable use of fertilizers4 Developments in nitrogen fertilizers5 Developments in phosphorus fertilizers6 Developments in potassium fertilizers7 Developments in sulfur fertilizers8 Developments in calcium, magnesium, and micronutrient fertilizers9 Case study10 Conclusion and future trends11 Where to look for further information12 References Chapter taken from: Rengel, Z. (ed.), Achieving sustainable crop nutrition, Burleigh Dodds Science Publishing, Cambridge, UK, 2020, (ISBN 978 1 78676 312 9)Chapter 4 - Advances in fertigation techniques to optimize crop nutrition: Asher Bar-Tal, Uri Yermiyahu and Alon Ben-Gal, Agricultural Research Organization (ARO), Israel; 1 Introduction2 The right rate at the right time: nutrient consumption curves and supply3 Irrigation frequency4 The right place: water, salt, nutrient and root development under irrigation5 The right source: fertilizer type and source6 Models and decision support tools for design, operation and optimization of fertigation systems7 Case studies8 Conclusion9 Future trends10 References Chapter taken from: Rengel, Z. (ed.), Achieving sustainable crop nutrition, Burleigh Dodds Science Publishing, Cambridge, UK, 2020, (ISBN 978 1 78676 312 9)

Bryan G. Hopkins is a Professor at Brigham Young University and a Certified Professional Soil Scientist. He is the Coordinator for the Soil Science Society of America--North American Proficiency Testing Program. He has degrees from Ricks College, Brigham Young University, and Kansas State University in Agronomy & Horticulture with specialties in soil biophysical chemistry and plant nutrition. He has published dozens of peer reviewed manuscripts and book chapters and hundreds of research reports and given countless presentations. Dr Asher Bar-Tal is a Senior Researcher at the Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO, the Volcani Center) of Israel. In 1987 he earned Ph.D. from The Hebrew University of Jerusalem. From 2011 to 2013 he served as the Chairman of the Department of Soil Chemistry, Plant Nutrition and Microbiology, Institute of Soil, Water and Environmental Sciences, The Volcani Center, ARO. Dr Bar-Tal currently serves as the president of the Israeli Society of Soil Science. His research interests focus on soil chemistry, plant nutrition and fertilization of crops.

• Chapter 1 - Spray technologies in precision agriculture: Paul Miller, Silsoe Spray Applications Unit Ltd, UK; 1 Introduction2 Features of field crop sprayers for precision agriculture3 Case study 1: designing and developing a system for spot treatment of volunteer potatoes4 Case study 2: a patch spraying system for applying herbicides to field crops5 Conclusion6 Future trends7 Where to look for further information8 References Chapter taken from: Stafford, J. (ed.), Precision agriculture for sustainability, Burleigh Dodds Science Publishing, Cambridge, UK, 2018, (ISBN 978 1 78676 204 7)Chapter 2 - Site-specific nutrient management systems: Dan S. Long, USDA-ARS, USA; 1 Introduction2 Processes to inform site-specific nutrient management3 Regional perspectives4 Conclusions and future trends5 Where to look for further information6 References Chapter taken from: Stafford, J. (ed.), Precision agriculture for sustainability, Burleigh Dodds Science Publishing, Cambridge, UK, 2018, (ISBN 978 1 78676 204 7)Chapter 3 - Developments in the use of fertilizers: Bryan G. Hopkins, Brigham Young University, USA; 1 Introduction2 Nutrient pollution and resource depletion3 Achieving more sustainable use of fertilizers4 Developments in nitrogen fertilizers5 Developments in phosphorus fertilizers6 Developments in potassium fertilizers7 Developments in sulfur fertilizers8 Developments in calcium, magnesium, and micronutrient fertilizers9 Case study10 Conclusion and future trends11 Where to look for further information12 References Chapter taken from: Rengel, Z. (ed.), Achieving sustainable crop nutrition, Burleigh Dodds Science Publishing, Cambridge, UK, 2020, (ISBN 978 1 78676 312 9)Chapter 4 - Advances in fertigation techniques to optimize crop nutrition: Asher Bar-Tal, Uri Yermiyahu and Alon Ben-Gal, Agricultural Research Organization (ARO), Israel; 1 Introduction2 The right rate at the right time: nutrient consumption curves and supply3 Irrigation frequency4 The right place: water, salt, nutrient and root development under irrigation5 The right source: fertilizer type and source6 Models and decision support tools for design, operation and optimization of fertigation systems7 Case studies8 Conclusion9 Future trends10 References Chapter taken from: Rengel, Z. (ed.), Achieving sustainable crop nutrition, Burleigh Dodds Science Publishing, Cambridge, UK, 2020, (ISBN 978 1 78676 312 9)

Bryan G. Hopkins is a Professor at Brigham Young University and a Certified Professional Soil Scientist. He is the Coordinator for the Soil Science Society of America--North American Proficiency Testing Program. He has degrees from Ricks College, Brigham Young University, and Kansas State University in Agronomy & Horticulture with specialties in soil biophysical chemistry and plant nutrition. He has published dozens of peer reviewed manuscripts and book chapters and hundreds of research reports and given countless presentations. Dr Asher Bar-Tal is a Senior Researcher at the Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization (ARO, the Volcani Center) of Israel. In 1987 he earned Ph.D. from The Hebrew University of Jerusalem. From 2011 to 2013 he served as the Chairman of the Department of Soil Chemistry, Plant Nutrition and Microbiology, Institute of Soil, Water and Environmental Sciences, The Volcani Center, ARO. Dr Bar-Tal currently serves as the president of the Israeli Society of Soil Science. His research interests focus on soil chemistry, plant nutrition and fertilization of crops.

• Chapter 1 - Spray technologies in precision agriculture: Paul Miller, Silsoe Spray Applications Unit Ltd, UK; 1 Introduction2 Features of field crop sprayers for precision agriculture3 Case study 1: designing and developing a system for spot treatment of volunteer potatoes4 Case study 2: a patch spraying system for applying herbicides to field crops5 Conclusion6 Future trends7 Where to look for further information8 References Chapter taken from: Stafford, J. (ed.), Precision agriculture for sustainability, Burleigh Dodds Science Publishing, Cambridge, UK, 2018, (ISBN 978 1 78676 204 7)Chapter 2 - Site-specific nutrient management systems: Dan S. Long, USDA-ARS, USA; 1 Introduction2 Processes to inform site-specific nutrient management3 Regional perspectives4 Conclusions and future trends5 Where to look for further information6 References Chapter taken from: Stafford, J. (ed.), Precision agriculture for sustainability, Burleigh Dodds Science Publishing, Cambridge, UK, 2018, (ISBN 978 1 78676 204 7)Chapter 3 - Developments in the use of fertilizers: Bryan G. Hopkins, Brigham Young University, USA; 1 Introduction2 Nutrient pollution and resource depletion3 Achieving more sustainable use of fertilizers4 Developments in nitrogen fertilizers5 Developments in phosphorus fertilizers6 Developments in potassium fertilizers7 Developments in sulfur fertilizers8 Developments in calcium, magnesium, and micronutrient fertilizers9 Case study10 Conclusion and future trends11 Where to look for further information12 References Chapter taken from: Rengel, Z. (ed.), Achieving sustainable crop nutrition, Burleigh Dodds Science Publishing, Cambridge, UK, 2020, (ISBN 978 1 78676 312 9)Chapter 4 - Advances in fertigation techniques to optimize crop nutrition: Asher Bar-Tal, Uri Yermiyahu and Alon Ben-Gal, Agricultural Research Organization (ARO), Israel; 1 Introduction2 The right rate at the right time: nutrient consumption curves and supply3 Irrigation frequency4 The right place: water, salt, nutrient and root development under irrigation5 The right source: fertilizer type and source6 Models and decision support tools for design, operation and optimization of fertigation systems7 Case studies8 Conclusion9 Future trends10 References Chapter taken from: Rengel, Z. (ed.), Achieving sustainable crop nutrition, Burleigh Dodds Science Publishing, Cambridge, UK, 2020, (ISBN 978 1 78676 312 9)