1. Fleming, H., Haselkorn, R.: Differentiation in Nostocmuscurum-Nitrogenase is synthesized in heterocysts. Proc. Natl. Acad. Sci. 70, 2727–2731 (1993)
2. El-Kouny, H.M.: Effect of organic fertilizer in different application rates under salinity stress on soil and plant. International symposium and optimum resources utilization in salt affected soil Ecosystems in arid and semi arid regions, 8–11 April 2002, Egypt Le Meridian Heliopolis Hotel, Abst. Book, Cairo, pp: 33 (2002)
3. Mahmoud, A.A., Mostafa, S.S.M., Abd El-All, A.A.M., Hegazi, A.Z.: Effect of cyanobacterial inoculation in presence of organic and inorganic amendments on carrot yield and sandy soil properties under drip irrigation regime. Egypt. J. Appl. Sci. 22, 716–733 (2007)
4. Crouch, J.J., Van Standen, J.: Evidence for rooting factors in a seaweed prepared from Ecklonia maxima. J. Plant Physiol. 137, 319–322 (1991)
5. Devlin, R.M., Jackson, L.M.: Effect of P-chlorophenoxy-isobutric acid on rate of elongation of root hair of Agrostis alba L. Physiol. Plant. 14, 40–48 (1961)