sentences: https://doi.org/10.1016/j.compag.2018.02.016 Received 14 July 2017; Received in revised form 7 February 2018; Accepted 10 February 2018 ⁎ Corresponding author. E-mail address: andreas.kamilaris@irta.cat (A. Kamilaris). Computers and Electronics in Agriculture 147 (2018) 70–90 0168-1699/ © 2018 Elsevier B.V. All rights reserved. T