Azolla - IRRI books - International Rice Research Institute

N 2 fixation associated with riceIto O, Cabrera C, Watanabe I (1980) Fixation of dinitrogen-15associated with rice plant. Appl. Environ.Microbiol. 39:554-558.Ladha J K, So R, Watanabe I (1987) Composition ofAzospirillum species associated with wetland rice plantgrown in different soils. Plant Soil 102:127-129.Ladha J K, Tirol-Padre A, Punzalan G, Watanabe I(1987) Nitrogen-fixing (C 2 H 2 -reducing) activity andplant growth characters of 16 wetland rice varieties. SoilSci. Plant Nutr. 33:187-200.Lee Ku-ki, Alimagno B V, Yoshida T (1977) Fieldtechnique using the acetylene reduction method toassay nitrogenase activity and its association with ricerhizosphere. Plant Soil 47:519-526.Tirol-Padre A, Ladha J K, Punzalan G, Watanabe I(1988) A plant sampling procedure for acetylenereduction assay to detect rice varietal differences inability to stimulate N 2 fixation. Soil Biol. Biochem.20:175-183.Watanabe I, Cabrera D A, Barraquio W L (1981) Contributionof basal portion of shoot to N 2 -fixation associatedwith wetland rice. Plant Soil 59:391-398.Yoshida T, Ancajas R R (1971) Nitrogen fixation bybacteria in the root zone of rice. Soil Sci. Soc. Am. Proc.35:156-157.Barraquio W L, Watanabe I (1981) Occurrence ofaerobic nitrogen fixing bacteria in wetland and drylandplants. Soil Sci. Plant Nutr. 27:121-125.Ladha J K, Barraquio W L, Watanabe I (1982) Immunologicaltechniques to identify Azospirillum associatedwith wetland rice. Can. J. Microbiol. 28:478-485.Ladha J K. Barraquio W L, Watanabe I (1983) Isolationand identification of nitrogen-fixing Enterobactercloacae and Klebsiella planticola associated with riceplants. Can. J. Microbiol. 29:1031-1038.Ladha J K, Tirol-Padre A, Daroy M L G, Punzalan G,Watanabe (1987) The effects on N 2 fixation (C 2 H 2reduction), bacterial population and rice plant growthof two modes of straw application to a wetland ricefield. Biol. Fert. Soils 5:106-111Watanabe I, Barraquio W L (1979) Low levels of fixednitrogen required for isolation of free-living N 2-fixingorganisms from rice roots. Nature 277:565-566.Watanabe I, So R, Ladha J K, Katayama-Fujimura Y,Kuraishi H (1987) A new nitrogen-fixing species ofPseudomonad: Pseudomonas diazotrophicus sp. nov.isolated from the root of wetland rice. Can. J. Micrbiol.33:670-678.Inoculation and effect on plantsLadha J K, Nayak D N , Watanabe I (1986) The fate ofmarker Azospirillum lipoferum inoculated into rice andits effect on growth, yield and N 2 fixation of plantsstudied by acetylene reduction, 15 N 2 feeding and 15 NYoshida T. Ancajas R R (1973) Nitrogen-fixing activity inupland and flooded rice fields. Soil Sci. Soc. Am. Proc.37:42-46. dilution techniques. Biol. Fert. Soils 2:7-14.Associative bacteriaBarraquio W L, De Guzman M R, Barrion M, Watanabe I(1982) Population of aerobic heterotrophic nitrogenfixingbacteria associated with wetland and drylandrice. Appl. Environ. Microbiol. 43:124-128.Barraquio W L, Ladha J K, Watanabe I (1983) Isolationand identification of N 2 -fixing Pseudomonas associatedwith wetland rice. Can. J. Microbiol. 29:867-873.Barraquio W L, Ladha J K, Yao Hui-quin, Watanabe I(1986) Antigenic relationship of N 2 -fixing Pseudomonasstrain H8 to various known cultures and ricerhizosphere isolates studied by indirect enzyme-linkedimmunosorbent assay (ELISA). Can. J. Microbiol.32:402-412.Murty M CG, Ladha J K (1987) Differential colonizationof Azospirillum lipoferrum on roots of two varieties ofrice ( Oryza sativa L.). Biol. Fert. Soils 4:37.Murty M G, Ladha J K (1988) Influence of Azospirilluminoculation on mineral uptake and growth of rice underhydroponic conditions. Plant Soil 108:281-285.Watanabe I, Lin Chang (1984) Response of wetland riceto inoculation with Azospirillum lipoferum sp. Soil Sci.Plant Nutr. 30: 117-124.26