Author/Authors :
taha, a. a. mansoura university - fac. of agric. - soils dept., Egypt , el-shehawy, m. e. agricultural research center (a.r.c) - soils, water and environment res. inst., Egypt , mosa, a. a. mansoura university - fac. of agric. - soils dept., Egypt , el-komy, m. n. agricultural research center(a.r.c) - soils, water and environment res. inst., egypt