References
- Ashton, P.J. 1971. Effect of some environmental factors on the growth of Azolla fliculoides Lam., The Orange River, Progress Report, Inst. For Environmental Sciences University of the O.F.S., South Africa. 123–136.
- Bremner, J.M. 1965. Total Nitrogen in Methods of Soil Analysis. In C. A. Black ed., Amer. Soc. of Agr. Inc. Pub., Madison, Wisconsin, USA. 11749–1178.
- Gevrek, M.N. and Yağmur, B. 1996. The effect of Azolla (Azolla anabaena) on nitrogen and organic matter of the soil. Ege University J. of Faculty of Agriculture 33 : 97–103.
- Gevrek, M.N. 2000. A study on Azolla as a nitrogen source in rice farming. Turk. J. Agric. For. 24 : 165–172.
- Hove, C. V. 1989. Azolla and its multiple uses on Africa. F.A.O.42.
- Jackson, M.L. 1962. Soil Chemical Analysis. Prenctice Hall, Inc. Englewood. Chiffs, N.J. 27–28.
- Kacar, B. 1972. Plant and Soil Analyses II. Ankara University, Faculty of Agriculture 453. Pub. Ankara. University, Ankara,155.
- Khan, M.M. 1987. Is Azolla a viable supplement and/or substi-tute for chemical fertilizer SERCA technical bulletin 3: 1–12.
- Lindsay, W.L. and Norwell, W.A. 1978. Development of a DTPA soil test for zinc, iron, manganese and copper. Soil Sci. Soc. Amer. Jour. 42 : 421–428.
- Lumpkin T.A. and Plucknett, D.L. 1982. Azolla as a Green Manure: Use and Management in Crop Production. Westview Tropical Agriculture Series, No.5. Library of Congress Catalog Card Number 82–50919 ISBN 0–89158-451-X.
- Pratt, P.F. 1965. Potassium in methods of soil analysis. In C. A. Black ed., Amer. Soc. of Agr. Inc. Pub. Madison, Wisconsin, USA. 1022.
- Peters, G.A., Toia, R.E., Evans, W.R., Crist, D. K., Mayne, B.C. and Poole, R.E.1980. Characterization and comparisons of five N2 fixing Azolla-Anabaena associations. I. Optimization of growth conditions for biomass increase and N content in a controlled environment. Plant Cell Environ. 3 : 261–269.
- SAS Institute. 1980. SAS Userżs Guide. Statistical Analysis Institute Inc., Cary, NC. USA.
- Stell, R.G.D. and Torrie, J.H. 1980. Principles and Procedures of Statistics: A Biometric Approach. 2nd ed. McGraw-Hill, NY. USA.
- Talley, S.N., Talley, B.J. and Rains, R.W. 1977. In D. A. Hol-laender et al. eds., Nitrogen Fixation by Azolla in Rice Field. Plenum Press, New York. 259–281.
- Unal, M. and Uzen, E., 1996. A new aquatic fern record for the flora of Turkey: Azolla filiculoides Lam, Tr. J. of Botany 20 : 379–381.
- Watanabe, I., Espinas, C.R., Berja, N.S. and Alimagno, B.V. 1977. Utilization of Azolla-Anabaena complex as a nitrogen fertilizer for rice. IRRI Research Paper Series N : 11, November.
- Wilbur,V. and Watanabe, I.1980. Azolla and Sesbania: Organic fertilizers, Philippine Environment Conference on 14–18 June, Manila.