EFFECT OF DIFFERENT FORMS OF NITROGEN ON GROWTH, NITROGEN FIXATION AND PIGMENT CONTENTS OF CYANOBACTERIA | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 4, Volume 31, Issue 8, August 2006, Page 5323-5342 PDF (199.79 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2006.222273 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| EI- Sayeda A. Hassan | ||||
| Agricultural Microbiology Department, Soils. Water Res. and Environ. Institute. Agric., Res. Center (ARC), Giza, Egypt | ||||
| Abstract | ||||
| Growth, nitrogen fixation and pigment contents were followed in four batch cultures of local cyanobacteria strains, namely Anabaena so. Nosloc muscorum, Tolypolhrfx tenufs and Calofhrfx brevissima supplemented with range of Nitrate-N. urea-N and Ammonium-N. All the nitrogen sources decreased significantly the growth of the tested cyanobacteria strains in the term of dry weight criteria. Cyanobacteria strains exhibited variable nitrogen fixed amounts, chlorophyll a and C— phycocyanin amounts due to the exposure any of Nitrate—N, urea-N and Ammonium~ N However, the ability of these cyanobacteria strains to assimilate the nitrogen source differs from each other. This could be explained by giving the assimilation order of the tested nitrogen sources as NO;.N :- urea-N > ammonium-N for all cyanobacteria strains. | ||||
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