الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 77 |  |  |
| | | from | 77 | | |
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,