1. Adjunct Assistant Professor, Dept. of Construction, and Architectural Engineering, The Maerical University in Cairo, AUC Avenue, New Cairo, 11835, Egypt. (corresponding author).
2. Associate Professor, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., 482a Town Engineering, Ames, IA 50011.
3. Assistant Scientist, Dept. of Agronomy, Iowa State Univ., 3015 Agronomy Hall, Ames, IA 50011.
4. Professor, Dept. of Agronomy and Dept. of Geological and Atmospheric Science, Iowa State Univ., 3013 Agronomy Hall, Ames, IA 50011.