Marko Petek is an Associate Professor at the Division for Agroecology, Department of Plant Nutrition, University of Zagreb Faculty of Agriculture, Zagreb, Croatia. From 2003 to 2009, he joined the Faculty of Agriculture at the University of Zagreb to complete his Ph.D. studies. At the same university, he got his MSc in 2003. Since 2003, he has started his working experience. From 2003 to 2009, he was an assistant at the Faculty of Agriculture, University of Zagreb. Then he became a senior assistant. From 2014 to 2015, he worked as a senior advisor for governing the market for fruit and vegetables and for food labeling in the Ministry of Agriculture. His research interests are plant nutrition in horticulture; mineral composition of fruits and vegetables; organic, mineral, and foliar fertilization; and macro and microelements.