Paula Carrión-Prieto,1 Pablo Martín-Ramos,2* Salvador Hernández-Navarro,1 Iosody Silva-Castro,1 Manuela Ramos- Silva,3 Jesús Martín-Gil1
1Agriculture and Forestry Engineering Department, ETSIIAA, Universidad de Valladolid, Avenida de Madrid 44, 34004 Palencia, SPAIN.
2Department of Agricultural and Environmental Sciences, Higher Polytechnic School of Huesca, University of Zaragoza, Carretera de Cuarte, s/n, 22071 Huesca, SPAIN.
3CFisUC, Department of Physics, University of Coimbra, Rua Larga, P-3004-516 Coimbra, Portugal.