الفهرس | Only 14 pages are availabe for public view |
Abstract Blue- g:r,een a I gal! a re one of the fi r<st ••gent s rea,ogenJzcd to fix Ritr~gen in flooded riee soils ~ince tho Work ot De 0939)., The importance of bl ue-greena) gae was. emphfts ize d by many investiga t or ~. However, r j sing cos 1s of chEmical. f,ertllizers e.g. nitrogen had drown the e t t en t l cn on b Ie l og icat sources of this element which is mostly a limiting hct<Jr for corp p,roQuction •. For paddy ri ee , one of the Important bio,loigic”,1 sour ees of· eombi ned hi tr,ogen is bluc- g reen algae, (BOA) the subject, of .trit s thesis. ...., Many eastern countries such is India,. Japan, Phill ip~ pines, e t e . hadstI,eeessfully used aIg a l ,inoculation and bad demonstrated that blue-green ~lgae can serve as an ~)terna. live orSU’Pplementsl SOUrce of ni hogen f,or rice cuH ivation, Also, it Ny give some advantages to soil and erop, lhrough the produc t ion, 0’( growth- promot i ng: Substances. During the last t”,o decades much importance was given to ecological aDd ph~8iologleal reSearch to e~aluato the relation between blu(l-green lligae and rice. On the other hand Ilwnerous soils In the Nile valley· were shitted towards the alkallnlf·Y se t t l’elll~ring some 01 p Ian t nu t r i en t s i.n une.vai.- lable forms.Suoh C!lu.e c:ould be oliminated in tne paddy field ecosystem whleh DIlIkel an environment favQuraMe fen thea-lOO_ttl 0(· Ba.\ with respect to their requir’ement5 for Hght, |