8Morad M M, Elsaid G H, El-Sharabasy M M A, et al. Comparative study between manual and mechanical methods of harvesting sugar beet crop[J]. Journal of Agricultural Engineering, 2007, 24(4): 793-813.
9Gyanendra Singh. Estimation of a mechanisation index and its impact on production and economic factors: A case study in India[J]. Biosystems Engineering, 2006, 93(1): 99-106.
10Ghorbani M. Evaluation of agricultural advisory services effects on sugar beet in Razavi Khorasan province[J]. Journal of Applied Sciences, 2008, 8(20): 3733-3737.