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- W1992052008 abstract "Sterile sandy clay loam and sandy loam soils were supplemented with increasing levels of (NH 4 ) 2 SO 4 , inoculated with fresh soil suspension as well as with different amounts of Nitrosomonas and Nitrobacter liquid cultures to obtain different densities and ratios of both organisms. Soils were kept at a constant moisture level of 60 % WHC and incubated at 30 °C. Inorganic forms of nitrogen were determined at weekly intervals. Ammonium oxidation from the beginning of the experiment without a delay period and the maximum rate of oxidation occurred in the second week. The effect of Nitrosomonas population size was observed only in the first week. The magnitude of nitrite accumulation was linked with the level of the fertilizer applied. The Nitrobacter initial density had also a pronounced effect, since in presence of low counts higher amounts of NO 2 -N were formed and persisted in soils for longer time. Nitrite accumulation in the treatments of the sandy loam was invariably lower than that in the corresponding ones of the sandy clay loam. Rates of nitrate production were much higher when soils harboured more dense population of Nitrobacter . Nitrification in sandy loam was rather rapid than in the other soil. Steriler sandiger Ton und sandiger Lehm wurden mit steigenden Gaben von Ammonsulfat versetzt und mit frischen Bodensuspensionen sowie mit Flüssigkulturen unterschiedlicher Dichte und Verhältnisse von Nitrosomonas und Nitrobacter beimpft. Der Feuchtigkeitsgehalt des Bodens betrug 60 % MWK, die Inkubationstemperatur 30°C. Die Ammoniumoxydation begann sofort und erreichte ihr Maximum in der 2. Woche. Die Wirkung der Nitrosomonas -Population wurde nur in der 1. Woche beobachtet. Der Nitritgehalt korrelierte mit der verabreichten NH 4 -Menge. Die anfängliche Nitrobacter -Dichte hatte gleichfalls einen deutlichen Effekt, denn bei niedrigen Dichten wurden höhere Nitritmengen gebildet, die länger im Boden verblieben, besonders im sandigen Lehm. Bei höheren Nitrobacter -Gehalten war auch die Nitratbildung höher. Die Nitrifikation war im sandigen Lehm höher als im sandigen Ton." @default.
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- W1992052008 date "1980-01-01" @default.
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- W1992052008 title "Ammonium Oxidation and Nitrite Accumulation as Affected by the Initial Densities of Nitrifying Bacteria in Soil" @default.
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- W1992052008 doi "https://doi.org/10.1016/s0323-6056(80)80054-1" @default.
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