scholarly journals Cyanobacterial nitrogen fixation in arid soils of Central Australia

1990 ◽  
Vol 7 (1) ◽  
pp. 79-89 ◽  
Author(s):  
Geoffrey D. Smith ◽  
Ronald M. Lynch ◽  
Gerry Jacobson ◽  
Christopher J. Barnes
Keyword(s):  
Nitrogen Fixation ◽  
Arid Soils ◽  
Central Australia

Cyanobacterial nitrogen fixation in arid soils of Central Australia

1990 ◽  
Vol 74 (1) ◽  
pp. 79-89 ◽  
Author(s):  
Geoffrey D. Smith ◽  
Ronald M. Lynch ◽  
Gerry Jacobson ◽  
Christopher J. Barnes
Keyword(s):  
Nitrogen Fixation ◽  
Arid Soils ◽  
Central Australia

scholarly journals BIOLOGICAL NITROGEN FIXATION STABILITY OF COWPEA CULTIVARS WITH TROPICAL SEMI-ARID RHIZOBIAL STRAINS

2021 ◽  
Vol 34 (2) ◽  
pp. 359-369
Author(s):  
AMANDA CORDEIRO DE MELO SOUZA ◽  
THIAGO PONTES LIRA ◽  
ANTONIO FÉLIX DA COSTA ◽  
FELIPE JOSÉ CURY FRACETTO ◽  
GISELLE GOMES MONTEIRO FRACETTO ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Biological Nitrogen Fixation ◽  
Dry Matter ◽  
Block Design ◽  
Nitrogen Accumulation ◽  
Arid Soils ◽  
Cowpea Cultivars ◽  
Nodule Number ◽  
Biological Nitrogen ◽  
Semi Arid

ABSTRACT Cowpeas (Vigna unguiculata L. Walp) are an economically and socially important legume in northern and north-eastern Brazil and can establish effective symbiosis with nitrogen-fixing bacteria. We evaluated the symbiotic compatibility and efficiency of rhizobial strains from Pernambuco semi-arid soils and determined their symbiotic stability on the IPA-206, BR 17-Gurguéia, and BRS Novaera cultivars, selected for different environments. The experiment was conducted in a greenhouse to evaluate a 3 × 28 factorial arrangement (cultivars selected for different environments × inoculation with the currently recommended strain, uninoculated plants with or without mineral nitrogen, and 25 rhizobial strains from semi-arid soils) in a randomized block design with four replicates. We determined nodule number, shoot and root dry matter, nodule dry matter by nodule number, nitrogen accumulated in the shoot by nodule dry matter, nitrogen content and accumulation in the shoot, relative efficiency of the recommended strain based on nitrogen accumulation, and shoot dry matter. Overall, the cultivars responded differently to different strains and cultivar biological nitrogen fixation potential. Strains G7.85 and BR 3262 showed potential for biological nitrogen fixation. BR 3262 was confirmed to be adequate for inoculation of different cowpea cultivars.

Phylogenetic and symbiotic characterization of rhizobial bacteria nodulating Argyrolobium uniflorum in Tunisian arid soils

2008 ◽  
Vol 54 (3) ◽  
pp. 209-217 ◽  
Author(s):  
M. Mahdhi ◽  
P. de Lajudie ◽  
M. Mars
Keyword(s):  
Nitrogen Fixation ◽  
16S Rrna ◽  
Root Nodules ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Arid Areas ◽  
Arid Soils ◽  
Bacterial Isolates ◽  
Phenotypic Features

Forty-two bacterial isolates from root nodules of Argyrolobium uniflorum growing in the arid areas of Tunisia were characterized by phenotypic features, RFLP, and sequencing of PCR-amplified 16S rRNA genes. The isolates were found to be phenotypically diverse. The majority of the isolates tolerated 3% NaCl and grew at temperatures up to 40 °C. Phylogenetically, the new isolates were grouped in the genera Sinorhizobium (27), Rhizobium (13), and Agrobacterium (2). Except for the 2 Agrobacterium isolates, all strains induced nodulation on Argyrolobium uniflorum, but the number of nodules and nitrogen fixation efficiency varied among them. Sinorhizobium sp. strains STM 4034, STM 4036, and STM 4039, forming the most effective symbiosis, are potential candidates for inoculants in revegetalisation programs.

Factors controlling nitrogen fixation in temperate seagrass beds

2015 ◽  
Vol 525 ◽  
pp. 41-51 ◽  
Author(s):  
PLM Cook ◽  
V Evrard ◽  
RJ Woodland
Keyword(s):  
Nitrogen Fixation ◽  
Seagrass Beds

NEW CLOVER CULTIVARS FOR WAIKATO DAIRY PASTURE: ESTABLISHMENT, PRODUCTION AND NITROGEN FIXATION DURING THE FIRST YEAR

1988 ◽  
pp. 207-211
Author(s):  
S.F. Ledgard ◽  
G.J. Brier ◽  
R.N. Watson
Keyword(s):  
Nitrogen Fixation ◽  
White Clover ◽  
Dairy Cow ◽  
Red Clover ◽  
First Year ◽  
Buried Seed

Clover cultivars grown with ryegrass were compared in an establishment year under dairy cow grazing. There was no difference in total annual productton but summer production was greater with Pawera red clover and with Kopu or Pitau white clovers. Clovers differed little in the proportion of nitrogen fixed, except during summer when values were highest for Pawera. Pawera was less prone to nematode attack than white clover cultivars but was more susceptible to clover rot. Resident clovers and high buried seed levels (e.g., 11-91 kg/ha) made introduction of new clover cultivars difficult. Sown clovers established best (50-70% of total clover plants) when drilled into soil treated with dicamba and glyphosate. Keywords: white clover, red clover, nematodes. nitrogen fixation, pasture renovation

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