Discussion of 'Soil Water Retention Characteristics of Vertisols and Pedotransfer Functions Based on Nearest Neighbor and Neural Networks Approaches to Estimate AWC' by N. G. Patil, D. K. Pal, C. Mandal, and D. K. Mandal. - Provenzano, G.; Giordano, G.; Rallo, G. (Journal of Irrigation & Drainage Engineering, 2013)