Studies on the response of Matthiola incana plants to some growth conditions. 2-In field: effect of foliar spray with zinc sulphate, calcium and paclobutrazol on growth and flowering (Hort. Dept. , Fac. Agric., Moshtohor, Zagazig University (Benha Branch) , Egypt.) Egypt. J. Appl. Sci; 18 (6); pp 291- 318.