Dr Youssef Rouphael is Professor of Vegetable Crops and Floriculture at the University of Naples Federico II, Italy.

Dr Patrick du Jardin is Professor of Plant Biology at the University of Liège, Belgium.

Dr Patrick Brown is Professor of Plant Nutrition at the University of California-Davis, USA.

Dr Stefania De Pascale is Professor of Horticulture at the University of Naples Federico II, Italy.

Dr Giuseppe Colla is Professor of Vegetable Production, Floriculture and Greenhouse Crop Production at the University of Tuscia, Italy.