02624cab a2200313Ia 4500001000800000003000600008008004100014040000800055041001300063100001900076240008500095245014700180246020000327300001600527504002300543520135300566546002301919650003401942650002201976650002901998650001502027650001602042700002202058700002302080700002002103700002002123773008802143856007902231u211559SIRSI091014s2015    ua     ss b   0     eng d  aEAL  aengbara1 aGhazal, F. M. 10aMinufiya journal of agricultural research, 2015 V.40 (5)h[electronic resource].10aCharacterization and identification of nitrogen fixing cyanobacteria in Egyptian sandy and alluvial (clay loam) soils h[electronic resource].15aوصف وتعريف السيانوبكتيريا المثبتة للنيتروجين الجوي في الأراضي الرملية والرسوبية (الطينية طميية) المصرية.  aP.1261-1271  aIncludes reference  aSamples of two different soils were collected from the surface layer (0- 30 cm) of El- lsmailia Research Station (sandy soil) (El- lsmailia Governorate) (30°35' 41.901" N, 32"16'45.834" E) and Sids Res. Farm (alluvial clay loam soil) (Beni Swef Governorate) (29" 4' 54.349" N, 31° 5' 25. 775" E), Agric. Res. Center, Giza Egypt, to isolate the prevailing cyanobacterial inhabitants. Characterization of the cyanobacterial biomass production and nitrogen fixing efficiency (nitrogenase activity) along 5 weeks incubation periods were also tested. Results revealed that, the six isolated cyanobacterial strains identified as Nostoc muscorum, Nostoc commune, Nostoc linckia, Nostoc ellipsosporum, Anabaena variabilis and Anabaena orientalis, and found to be commonly filamentous heterocystous nitrogen fixing agents. Nostoc muscorum recorded the highest biomass, followed by Anabaena variabilis, Anabaena orientalis. Nostoc linckia, Nostoc ellipsosporum and Nostoc commune. While, for nitrogenase activity, N. muscorum and A. variabilis gave the highest values against the others namely N. commune and N. linckia. Some of those cy§lnobacterial strains, i.e., N. muscorum and A. variabilis can be a promise to support and improve the fertility of soil, due to their high efficiency to fix the atmospheric nitrogen when inoculating the cropped soils.  aSummary in arabic. 0aCyanobacteriaxIdentification 0aSoil microbiology 0aNitrogen-fixing bacteria 0aClay soils 0aSandy soils1 aEl-Beltagy, A. E.1 aEl-Shinnawi, M. M.1 aHanfy, Wafaa M.1 aSalem, Gehan S.0 tMinufiya Journal of Agricultural Research. g2015.v.40(5)x1110-02657nnaswu15815140uhttp://nile.enal.sci.eg/EALE/2015/MJAR/4015/5/1261.pdfzFull Text Article.