Nitrogen fixation on early Mars by volcanic lightning and other sources

2005 ◽  
Vol 32 (5) ◽  
Author(s):  
Antígona Segura
Keyword(s):  
Nitrogen Fixation ◽  
Early Mars ◽  
Volcanic Lightning

scholarly journals Nitrogen Fixation at Early Mars

Astrobiology ◽  
2021 ◽  
Author(s):  
Danica Adams ◽  
Yangcheng Luo ◽  
Michael L. Wong ◽  
Patrick Dunn ◽  
Madeline Christensen ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Early Mars

scholarly journals Nitrogen fixation by volcanic lightning in the early Earth

1998 ◽  
Vol 25 (16) ◽  
pp. 3123-3126 ◽  
Author(s):  
Rafael Navarro-González ◽  
Mario J. Molina ◽  
Luisa T. Molina
Keyword(s):  
Nitrogen Fixation ◽  
Early Earth ◽  
Volcanic Lightning

Experimental Simulation of Volcanic Lightning on Early Mars

Astrobiology ◽  
2000 ◽  
pp. 293-296 ◽  
Author(s):  
Antígona Segura ◽  
Rafael Navarro-González
Keyword(s):  
Experimental Simulation ◽  
Early Mars ◽  
Volcanic Lightning

Mars: was There an Ancient Eden?

1997 ◽  
Vol 161 ◽  
pp. 203-218 ◽  
Author(s):  
Tobias C. Owen
Keyword(s):  
Positive Answer ◽  
Biogenic Elements ◽  
Habitable Zones ◽  
The Face ◽  
The Origin Of Life ◽  
Early Mars ◽  
Favorable Conditions ◽  
Open Question ◽  
Rocky Planets ◽  
Impact Erosion

AbstractThe clear evidence of water erosion on the surface of Mars suggests an early climate much more clement than the present one. Using a model for the origin of inner planet atmospheres by icy planetesimal impact, it is possible to reconstruct the original volatile inventory on Mars, starting from the thin atmosphere we observe today. Evidence for cometary impact can be found in the present abundances and isotope ratios of gases in the atmosphere and in SNC meteorites. If we invoke impact erosion to account for the present excess of129Xe, we predict an early inventory equivalent to at least 7.5 bars of CO2. This reservoir of volatiles is adequate to produce a substantial greenhouse effect, provided there is some small addition of SO2(volcanoes) or reduced gases (cometary impact). Thus it seems likely that conditions on early Mars were suitable for the origin of life – biogenic elements and liquid water were present at favorable conditions of pressure and temperature. Whether life began on Mars remains an open question, receiving hints of a positive answer from recent work on one of the Martian meteorites. The implications for habitable zones around other stars include the need to have rocky planets with sufficient mass to preserve atmospheres in the face of intensive early bombardment.

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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