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1 edition of Isotopic Studies of Azolla and Nitrogen Fertilization of Rice found in the catalog.

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

by K. S. Kumarasinghe

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Published by Springer Netherlands, Imprint, Springer in Dordrecht .
Written in English


About the Edition

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.

Edition Notes

Other titlesReport of an FAO/IAEA/SIDA Coordinated Research Programme on Isotopic Studies of Nitrogen Fixation and Nitrogen Cycling by Blue-Green Algae and Azolla
Statementedited by K.S. Kumarasinghe, D.L. Eskew
SeriesDevelopments in Plant and Soil Sciences -- 51, Developments in plant and soil sciences -- 51.
ContributionsEskew, D. L.
The Physical Object
Format[electronic resource] :
Pagination1 online resource (164 pages 6 illustrations).
Number of Pages164
ID Numbers
Open LibraryOL27064688M
ISBN 109401116814
ISBN 109789401116817
OCLC/WorldCa840309073

The free-floating aquatic fern Azolla is small and heterosporic, with a worldwide distribution in quiet waters (rivers, dams, creeks, etc.) and is considered an invasive species. This is the only known fern with a permanent symbiotic association with the heterocystic nitrogen-fixing cyanobacterium Anabaena azollae where the cyanobiont is transmitted through the Azolla Author: Ana L. Pereira.   Azolla as biofertilizer in Rice Azolla can be applied to rice crop 10 days after transplanting and Azolla grows along with rice as dual crop and fixes atmospheric nitrogen.

The literature on azolla and tilapia includes many studies that show a depression in growth and weight gain when azolla is added to the diet, sometimes even in small amounts. But some types of tilapia seem to do well on some types of azolla. And there are studies with other cichlids that I came across that show it is beneficial.   History of azolla use: Until middle of the 's, azolla was used for greenmanure to spring rice in northern Vietnam. Because of symbiotic nitrogen fixation, and consequently, high nitrogen content, Azolla has been used as a green manure for wetland rice in northern Vietnam, and central to southern China for centuries. In the early 's.

rice production management including Fertilizer Use Efficiency (FUE) and Integrated Nutrient Management (INM) to reach an average yield level of 4 to t/ha. Nitrogen is the key input for realizing the potential yield from modern high-yielding rice varieties and about 20 kg N is removed from soil to produce one tonne of brown rice. This study was conducted to determine the best combination of azolla (Azolla anabaena) and N fertilizer under Menemen ecological conditions in and The A. mexicana genotype of azolla was brought from the International Rice Research Institute (IRRI) and adapted to the Aegean region of Turkey. The results of study showed that the combination azolla + N fertilizer Cited by: 3.


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Isotopic Studies of Azolla and Nitrogen Fertilization of Rice by K. S. Kumarasinghe Download PDF EPUB FB2

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.

Comparison of the direct and indirect 15 N methods for evaluation of N uptake by rice from Azolla. Kumarasinghe, D. Eskew. Get this from a library.

Isotopic studies of Azolla and nitrogen fertilization of rice. [K S Kumarasinghe; D L Eskew; Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture. Soil Fertility, Irrigation, and Crop Production Section.;] -- Nitrogen is the most limiting element for crop production.

Traditionally, expensive commercial fertilizers are used to correct. 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.

Editors: Kumarasinghe, K.S., Eskew, D.L. (Eds.) Free Preview. : Isotopic Studies of Azolla and Nitrogen Fertilization of Rice: Report of an FAO/IAEA/SIDA Co-ordinated Research Programme on Isotopic Studies of (Developments in Plant and Soil Sciences) (): Kumarasinghe, K.S., Eskew, D.L.: BooksFormat: Hardcover.

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 Price: $ Get this from a library. 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.

[K S Kumarasinghe; D L Eskew] -- Nitrogen is the most limiting element for crop production. Cite this chapter as: Kumarasinghe K.S., Eskew D.L.

() Effects of urea and Azolla on N uptake and yield of rice. In: Kumarasinghe K.S., Eskew D.L. (eds) Isotopic Studies of Azolla and Nitrogen Fertilization of : K. Kumarasinghe, D. Eskew. The ability of Azolla’s symbiont, Anabaena, to sequester atmospheric nitrogen has been used for thousands of years in the Far East, where Azolla is extensively grown in rice paddies to increase rice production by more than to 50%.

Rice is an enormously important staple in many tropical and temperate regions of the world. Billions of people rely on the crop to live and hundreds of. Isotopic Studies of Azolla and Nitrogen Fertilization of Rice: Report of an FAO /IAEA/ SIDA Co-ordinated Research Programme on Isotopic Studies of (Developments in Plant and Soil Sciences.

Edited by K.S. Kumarasinghe and D.L. Eskew. Azolla is an unusual fern in being both aquatic and having a nitrogen-fixing endophyte (Figure 1b).

Being aquatic, it is not strictly relevant to a discussion on soils, but, as it has been and still is widely used as a nitrogen fertilizer for wetland rice, it will be mentioned. Its agricultural use has been the subject of many reviews.

These. The water fern Azolla harbors nitrogen-fixing cyanobacterium Anabaena azollae as symbiont in its dorsal leaves and is known as potent N 2 fixer. Present investigation was carried out to study the influence of fresh Azolla when used as basal incorporation in soil and as dual cropped with rice variety Mahsoori separately and together with and without chemical Cited by: 6.

Isotopic Studies Of Azolla And Nitrogen Fertilization Of Rice Report Of An Fao. $ Isotopic Studies Of Azolla And Nitrogen Fertili, Kumarasinghe, Eskew- $ Solar System History From Isotopic Signatures Of Volatile Elements Volume Resul.

$ Laboratory Manual for Physiological Studies of Rice Full view - Isotopic Studies of Azolla and Nitrogen Fertilization of Rice K.S. Kumarasinghe, D.L. Eskew Limited preview - All Book Search results » Bibliographic information. Title. 1. Introduction. Rice is a staple food for more than 50% of the world’s population, and nitrogen (N) fertilizer use is essential for enhancing rice production; however, the low efficiency of N fertilizer is characteristic of rice cropping systems (Fageria et al., ; Lassaletta et al., ; Zhang et al., ).It is estimated that only 20%–40% of the applied N is Cited by: 5.

Isotopic Studies of Azolla and Nitrogen Fertilization of Rice: Report of an FAO/IAEA/SIDA Co-ordinated Research Programme on Isotopic Studies of. The Rice Diet Solution BOOK The World-Famous Low-Sodium, Good-Carb, Detox Diet.

$ Free shipping. Isotopic Studies of Azolla and Nitrogen Fertilization of Rice: Report of an Fao/ $ Free shipping. La Costa Diet Exercise Book. $ A book that has been read but is in good condition.

Very minimal damage to the cover including 5/5(1). Azolla as a bio-fertilizer for rice crop is its decomposition in soil and availability of its nitrogen to the rice plants [6],On the other hand use of farmyard manure as a bio fertilizer not only acts as a source of N and other nutrients but also increases the efficiency of applied nitrogen, so organic matter and mixture of.

Azolla in association with blue-green alga anabaena can fix atmospheric Nitrogen (N) into ammonia which can be utilized by rice plant when it is incorporated into soil. Azolla contains from 2−5% N, −% Potassium (K) (dry weight). A two—year field experiment covering two rice growing regions was conducted to investigate the effect of urea one—time RZF on rice growth, nutrient uptake, and NUE.

The highest NH4+–N content for RZF at fertilizer point at 30 d and 60 d after fertilization were and mg kg–1 higher than FFP, by: 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 [].

70% of nitrogen in rice paddies can come from the fern-like water plant named Azolla. Azolla reproduces sexually, and asexually by splitting. From Wiki: Like all ferns, sexual reproduction leads.Lowland rice response to nitrogen fertilization Communications in Soil Science and Plant Analysis – [3] Fageria, N.

K. Plant tissue test for determinati on of optimum concentration and uptake of nitrogen at different growth stages in lowland rice. Communications in Soil Science and Plant Analysis –File Size: KB.Azolla is a floating pteridophyte, which contains as endosymbiont the nitrogen-fixing cyanobacterium Anabaena azollae (Nostocaceae family).

Widely cultivated in the Asian regions, Azolla is either incorporated into the soil before rice transplanting or grown as a dual crop along with rice. To examine the feasibility of its use in flooded rice fields sited in the Temperate Cited by: