Doctoral Dissertation of student / Ashour Eid Abu el-Maati was discussed on Thursday, 21/4/2016. The discussion committee included; Prof. Dr. Samir Ahmed Tail, Emeritus professor of agricultural engineering at Al- Azhar University, Prof. Dr. Adel Hamed Bahnasawy, the head of agricultural engineering department, Prof.Dr. Hasan Abd-Razik Abd- Mola, the head of agricultural engineering department at Al-Azhar University, Assieut, Prof.Dr. Ibrahim Yehia El-Sayed, the head of agricultural engineering research institute, Prof.Dr. Taha Hasan Mohktar Ashour, the assistant professor at the agricultural engineering department