The effect of pre-treatment of seeds of some arid zone tree species on their germination responses.
Ten seed treatments designed to break dormancy and improve germination (including mechanical scarification of the seed coat, soaking seeds in concentrated sulphuric acid and pouring water on seeds soaked in concentrated sulphuric acid) were assessed in Acacia seyal, A. salicina, A. nilotica, A. saligna, A. farnesiana, A. tortilis var. spirocarpa, Prosopis glandulosa, P. velutina, P. alba, Parkinsonia aculeata, Delonix regia, Albizia lebbek, Melia azedarach and Sesbania formosa. The results revealed that the seeds of P. alba, P. glandulosa and A. salicina did not suffer from any dormancy problems. Melia azedarach and Delonix regia suffered from dormancy problems but did not respond to any of the treatments. However, the remaining 10 species responded significantly to the 3 scarification treatments; the difference between the 2 acid treatments was not significant.