Aug 2014 – Oct. 2014, Vol. 4, No. 43201-3211. E- ISSN: 2249 –1929 Journal of Chemical, Biological and Physical Sciences An International Peer Review E-3 Journal of Sciences Available online atwww.jcbsc.org Section B: Biological Sciences CODEN (USA): JCBPAT Research Article 3201 J. Chem. Bio. Phy. Sci. Sec. B, Aug. 2014 – Oct. 2014; Vol.4, No.4; 3201-3211. The promotive effect of different concentrations of marine algae as biofertilizers on growth and yield of maize (Zea Mays L.) plants Fatma M. Al-shakankery a , Ragaa A. Hamouda a and Ammar M. M. b a Microbial Biotechnology Department, Genetic Engineering and Biotechnology Research Institute (GEBRI), University of Sadat City, Egypt b Plant pathology Department, Faculty of agriculture, Minoufiya University, Egypt Received: 11 July 2014; Revised: 30 July 2014; Accepted: 09 August 2014 Abstract: This study was carried out to evaluate the efficiency of using seaweeds (Padina vickersiae, Enteromorpha compressa, Ulva fasciata, Gelidium crinale, Jania rubens and Laurencia obtusa) as biofertilizers for improving growth and grain quality of maize (zea maize L.) plants. Gelidium crinale (3g/hill) gave the highest plant height (305.33 cm). The highest yield (cob weight 485.3 gm) was obtained with U. fasciata (4.5g/hill). Ulva fasciata (3 and 4.5 g/hill) gave the heighest increase in nitrogen content of grains 800% compared to control. Ulva fasciata (3g/hill) gave lipid percentage of 8.66% which was the highest compared to control while P. vickersiae (3 g/hill) gave the highest ascorbic acid content of (238.93 mg/100g). Keywords: Marine algae, biofertilizers, ear, grains Zea mays L, ascorbic acid, total phenol.