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Phosphorus requirements of soybean and cowpea as affected by mode of nutrition. Agron. J. 73:17-22. Chapman, H.D., and P.F. Pratt. 1961. Methods of analysis for soils, plants and waters. Division of Agricultural Sciences, University of California, Riverside. Date R.A. 1970. Microbiological problems in the inoculation and nodulation of legumes. Plant and Soil. 32:703-725. Date, R.A. and J. Halliday. 1979. Selecting Rhizobium for acid infertile soil of the tropics. Nature. 277:62-64. Dreyfus B.L. and Y.R. Dommergues. 1981. Nodulation of Acacia species by fast- and slow-growing tropical strains of Rhizobium. Appl. Environ. Microbiol. 41:97-99. Erdman, L.W., and U.M. Means. 1952. Use of total yield for predicting nitrogen content of inoculated legumes grown in sand culture. Soil Science. 73:231-235. Graham, P.H. and J.C. Rosas. 1979. Phosphorus fertilization and symbiotic nitrogen fixation in common bean. Agron. J. 71:925-926. Halliday, J. 1978. Field responses by tropical forage legumes to inoculation with Rhizobium. In P.A. Sanchez and L.E. Tergas (eds.). Pasture production in acid soils of the tropics, Centro Internacional de Agricultura Tropical, Cali, Colombia. p 123-137. Hardy, R.W.F., R.D. Holsten, E.K. Jackson and R.C. Burns. 1968. The acetylene-ethylene assay for N2 fixation: Laboratory and field evaluation. Plant Physiol. 43:1185-1207. Haydock, K.P. and D.O. Norris. 1967. Opposed curves for nitrogen per cent on dry weight given by Rhizobium dependent and nitrate dependent legumes. Aust. J. Sci. 29:426-427. Hohenberg, J.S., D.N. Munns, and C.L. Tucker. 1982. Rhizobium host specificities in Phaseolus coccineus L. and Phaseolus vulgaris L. Crop Sci. 22:455-459. Iruthayathas, E.E. and K. Vlassak. 1982. Symbiotic specificity in nodulation and nitrogen fixation between winged bean and Rhizobium. Scientia Horticulture 16:313-322. Lange, R.T. 1961. Nodule bacteria associated with the indigenous leguminosae of South-Western Australia. J. Gen. Microbiol. 61:351-359. Lawrie, A.C. 1983. Relationships among rhizobia from native Australian legumes. Appl. Environ. Microbiol. 45:1822-1828. Little, T.M., and F. J. Hills. 1978. Agricultural Experiment. Design and Analysis. John Wiley & Sons, New York. May, S.N. and B.B. Bohlool. 1983. Competition among Rhizobium leguminosarum strains for nodulation of lentils (Lens culinaris). Appl. Environ. Microbiol. 45:960-965. Mengel, D.B. and E.J. Kamprath. 1978. Effect of soil pH and liming on growth and nodulation of soybeans in Histosols. Agron. J. 70:959-963. Norris, D.O. and R.A. Date. 1976. Legume bacteriology. In N.H. Shaw and W.W. Bryan (eds.). Tropical pasture research: principles and methods. Commonwealth Bureau of Pastures and Field Crops, Bulletin 51, Hurley, England. p 134-174. Peters, D.B. 1965. Water availability. In Agronomy Monographs Methods of Soil Analysis. Am. Soc of Agronomy, Madison, WI. Postgate, J. 1971. The acetylene reduction technique for nitrogen fixation. In J.R. Norris and D.W. Ribbons (eds.). Methods in Microbiology, Academic Press, London. p 343-356. Skrdleta, F., and J. Karimova. 1969. Competition between two serotypes of Rhizobium japonicum used as a double strain inocula in varying proportions. Arch. Microbiol. 66:26-29. Sloger, C. 1969. Symbiotic effectiveness and N2 fixation in nodulated soybean. Plant Physiol. 44:1666-1668. Schwinghamer, E.A., H.J. Evans, and M.D. Dawson. 1970. Evaluation of effectiveness of mutant strains of Rhizobium by acetylene reduction to other criteria of nitrogen fixation. Plant and Soil. 33:192-212. Somasegaran, P., H.J. Hoben, and L. Lewinson. 1990. Symbiotic interactions of Phaseolus acutifolius x P. vulgaris hybrid progeny in symbiosis with Bradyrhizobium spp. and Rhizobium leguminosarum bv. phaseoli. Can. J. Microbiol. 37:497-503. Thies, J.E., B.B. Bohlool, and P.W. Singleton. 1991. Subgroups of the cowpea miscellany: symbiotic specificity within Bradyrhizobium spp. for Vigna unguiculata, Phaseolus lunatus, Arachis hypogaea, and Macroptilium atropurpureum. Appl. Environ. Microbiol. 57:1540-1545. Trinick, M.J. 1965. Medicago sativa nodulation with Leucaena leucocephala root-nodule bacteria. Aust. J. Sci. 27:263-264. Trinick, M.J. 1968. Nodulation of tropical legumes I. Specificity in the Rhizobium symbiosis of Leucaena leucocephala. Expl. Agric. 4:243-253. Trinick, M.J. 1973. Symbiosis between Rhizobium and the non-legume Trema aspera. Nature (London). 244:459-460. Trinick, M.J. 1980. Relationships among the fast-growing rhizobia of Lablab purpureus, Leucaena leucocephala, Mimosa spp., Acacia farnesiana and Sesbania grandiflora and their affinities with other rhizobial groups. Turk, D., H.H. Keyser, and P.W. Singleton. 1993. Response of tree legumes to rhizobial inoculation in relation to the population density of indigenous rhizobia. Soil. Biol. Biochem. 25:75-81. Vincent, J.M. 1970. A Manual for the Practical Study of Root-Nodule Bacteria. IBP Handbook No. 15, Blackwell Scientific Publications, Oxford. Wagner, G.H., G.M. Kassim, and S. Martyniuk. 1978. Nodulation of annual Medicago by strains of R. meliloti in a commercial inoculant as influenced by soil phosphorus and pH. Plant and Soil. 50:81-89. Weaver, R.W. 1975. Growing plants for Rhizobium effectiveness tests. Soil Biol. Biochem. 7:77-78. Wilson, J.K. 1944. Over five hundred reasons for abandoning the cross- inoculation groups of legumes. Soil Science. 58:61-69. Zablotowicz, R.M. and D.D. Focht. 1981. Physiological characteristics of cowpea rhizobia: Evaluation of symbiotic efficiency in Vigna unguiculata. Appl. Environ. Microbiol. 41:679-685.