%0 Conference Proceedings %T An underrelaxed-modified Picard iteration scheme for simulation of 3D wetting pattern under drip irrigation using Richards’ equation on non-orthogonal grids %A Naghedifar, Seyed Mohammadreza %A Ansari, Hossein %A Hasheminia, Seyed Majid %A Ziaei, Ali Naghi %J The 2nd National Congress on the Development of Agricultural Science and Natural Resources %D 2016