1Institute of Agricultural Engineering, Agricultural Research Organization, The Volcani Center, HaMaccabim Road 68, P.O. Box 15159, Rishon LeZion 7528809, Israel
2Department of Mechanical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer-Sheva 81405, Israel
3Triangle Research and Development Center, P.O. Box 2167, Kfar-Qari 30075, Israel
4Agricultural Extension Service of Israel - Shaham, Ministry of Agriculture, HaMaccabim Road 68, Rishon LeZion, P.O.Box 30, Beit Dagan 50200, Israel
5Biosystems Engineering, The University of Arizona, Tucson, AZ 85721, USA