Description: Das Projekt "Einfluss langjährig differenzierter organischer Düngung auf S-Bindungsformen und S-Nachlieferung einer Parabraunerde aus Löß" wird vom Umweltbundesamt gefördert und von Universität Bonn, Institut für Nutzpflanzenwissenschaften und Ressourcenschutz - Pflanzenernährung (Prof. Werner) durchgeführt. A sulphur fertilization which is orientated at the need of the crops presupposes above all knowledge of the medium- and long-term S supply by mineralization of organic S forms. Organic S forms can constitute up to 95 percent of total S. They are mainly composed of carbon bonded sulfur (C-S; e.g. S-containing amino acids) and not directly carbon bonded sulfur (C-O-S; e.g. ester sulfates). The latter probably play the more important role for S mineralization. Yet, statements are inconsistent regarding the contribution of various organic S forms. This might be to due to a different 'stability in relation to the attack of Arylsulfatase enzymes. We hypothezise that ester sulfates are not available for the enzymes when they are protected within soil aggregates. In this project, we want to check out, whether there is a causal relation between aggregate parameters (size, stability) and a biochemical S-mineralization of the ester sulfates. For this purpose, we use soil samples from a randomized long-term experiment with a differentiated, 45 year organic fertilization and a mineral fertilization variant as control. Besides, we will spike soil samples with 35S-sulfate and follow its fate over time (entrapment within ester sulfates, remobilization etc.).
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Bonn ? Aminosäure ? Mineraldünger ? Organischer Dünger ? Bodenchemie ? Kohlenstoff ? Organische Schwefelverbindung ? Ester ? Schwefel ? Braunerde ? Enzym ? Lössboden ? Radionuklid ? Organische Säure ? Bodenqualität ? Bodenprobe ? Bodenuntersuchung ? Düngung ? Kausalzusammenhang ? Langzeitverhalten ? Langzeituntersuchung ? Mineralisation ? Pflanzenernährung ? Vergleichsanalyse ? Wirkungsanalyse ? Ressourcenschutz ? Bindungswirkung ? Enzymaktivität ? Estersulfat ? Parabraunerde ? Speziation [Chemie] ? ester sulfate ?
Region: Nordrhein-Westfalen
Bounding box: 6.76339° .. 6.76339° x 51.21895° .. 51.21895°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2007-01-01 - 2010-12-31
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