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Isotopic Studies of Azolla and Nitrogen Fertilization of Rice - Report of an FAO/IAEA/SIDA Co-ordinated Research Programme on Isotopic Studies of Nitrogen Fixation and Nitrogen Cycling by Blue-Green Algae and Azolla (Paperback, Softcover reprint of the original 1st ed. 1993)
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Isotopic Studies of Azolla and Nitrogen Fertilization of Rice - Report of an FAO/IAEA/SIDA Co-ordinated Research Programme on Isotopic Studies of Nitrogen Fixation and Nitrogen Cycling by Blue-Green Algae and Azolla (Paperback, Softcover reprint of the original 1st ed. 1993)
Series: Developments in Plant and Soil Sciences, 51
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Nitrogen is the most limiting element for crop production.
Traditionally, expensive commercial fertilizers are used to correct
soil nitrogen deficiencies. Indeed, 50% of the increase in rice
yields after World War II can be attributed to increased fertilizer
nitrogen use. Although an increased rate of fertilizer nitrogen
application has been advocated to meet the growing demand for food,
it is unrealistic to advise the farmers to apply fertilizers they
could hardly afford, and whose prices are likely to escalate in the
years ahead. In addition, when they are not applied judiciously
there are problems of environmental pollution as plants are capable
of taking up only a relatively small portion of the applied
nitrogen, a substantial amount being lost through various chemical
and biological processes. The exploitation of cheaper alternatives
or supplements to fertilizers have therefore gained much interest
in recent years. Our increased interest in biological nitrogen
fixation as a supplement or alternative to nitrogen fertilizers led
to the convening of a consultants' meeting on `The Role of Isotopes
in Studies on Nitrogen Fixation and Nitrogen Cycling by Blue-Green
Algae and the Azolla-Anabaena azollae Association', in Vienna from
11--15 October 1982. The consultants' group recommended that the
Joint FAI/IAEA Division of Nuclear Techniques in Food and
Agriculture embark on a coordinated research programme in this
field and that initial emphasis should be placed on Azolla-Anabaena
symbiosis. As a result, such a programme was initiated in 1984,
which was concluded in 1989. The results and conclusions reported
here are those that were generated during the five years of its
operation.
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