<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Fixation of Isotopic Nitrogen on a Semiarid Soil by Algal Crust Organisms"^^ . "Semiarid desert algal crust organisms were found to fix N2\nwhen exposed to an atomosphere which contained isotopically\nenriched N. Significant quantities of the N isotope were detected\nin the total crust N after 3 days of incubation under field-simulated\nconditions.\n\nNet N2 fixation rates by the algal crust organisms were 0.16\nand 0.10 lb of N/acre of crust surface per day under continuous\nwet and cycling wet-dry conditions, respectively. Net fixation of\nN under field-simulated conditions adequately compensated for\nthe removal of N by livestock. The rate of N2 fixation under\nfield-simulated conditions increased linearly for at least 520 days.\nThe amount of N in the algal crust was doubled during this time.\nNo net N change was observed in dry crusts.\n\nGrowing algal crusts contained 1% to 2% of the total N as\nextracellular NH4-N. Excretion of some fixed nitrogen was\nsuggested by the isotopic enrichment of the extracellular N fraction\nand uptake of labeled N by grass seedlings (Artemesia sp.)\ngrowing on incubated crusts."^^ . "1966" . . "30" . "1" . . "Soil Science Society of America Proceedings"^^ . . . . . . . . . . . . . . "H.F."^^ . "Mayland"^^ . "H.F. Mayland"^^ . . "W.H."^^ . "Fuller"^^ . "W.H. Fuller"^^ . . "T.H."^^ . "McIntosh"^^ . "T.H. McIntosh"^^ . . . . . . "Fixation of Isotopic Nitrogen on a Semiarid Soil by Algal Crust Organisms (PDF)"^^ . . . . . . . . . "56.pdf"^^ . . . "Fixation of Isotopic Nitrogen on a Semiarid Soil by Algal Crust Organisms (Other)"^^ . . . . . . "indexcodes.txt"^^ . . "HTML Summary of #451 \n\nFixation of Isotopic Nitrogen on a Semiarid Soil by Algal Crust Organisms\n\n" . "text/html" . . . "Nitrogen"@en . . . "Mass Import - autoclassified (may be erroneous)"@en . .