Search results for "Landwirtschaft"
showing 8 items of 8 documents
Konferenz der Nationalen Komitees der Weltkraftkonferenz Lettlands, Estlands und Litauens: [Vorträge]
1939
Kopsavilkumi angļu valodā
Polyester microplastic fibers affect soil physical properties and erosion as a function of soil type
2021
Microplastics are recognized as a factor of global change contaminating many environmental compartments. Agricultural soils are very likely to receive microplastic contamination and are of particular concern due to their role in food production. Microplastic fibers have already been shown to be able to affect soil properties, but their effect on different soil types is poorly understood. Moreover, limited information is available on how the presence of this pollutant can affect soil water erosion processes, which are extremely important issues in many environments. In the light of this, we performed two experiments (carried out on a microscale) to investigate how the presence of polyester m…
Combined proton NMR wideline and NMR relaxometry to study SOM-water interactions of cation-treated soils
2013
Abstract Focusing on the idea that multivalent cations affect SOM matrix and surface, we treated peat and soil samples by solutions of NaCl, CaCl2 or AlCl3. Water binding was characterized with low field 1H-NMR-relaxometry (20 MHz) and 1H wideline NMR spectroscopy (400 MHz) and compared to contact angles. From 1H wideline, we distinguished mobile water and water involved in water molecule bridges (WaMB). Large part of cation bridges (CaB) between SOM functional groups are associated with WaMB. Unexpectedly, 1H NMRrelaxometry relaxation rates suggest that cross-linking in the Al-containing peat is not stronger than that by Ca. The relation between percentage of mobile water and WaMB water in…
Der Zukunftsstaat: Wirtschaftstechnisches Ideal und Volkswirtschaftliche Wirklichkeit
1927
Vierte, vollständig neu bearbeitete Auflage
Der Zukunftsstaat: Produktion und Konsum im Sozialstaat
1919
Katalog der dritten baltischen landwirtschaftlichen Ausstellung zu Riga, im Jahre 1880
1880
Inhalt: I. Theil. Gruppirung nach fortlaufender Schnuppen- und Ordnungsnummern ; II. Theil. Gruppirung nach Prämiirungs-Kategorien ; III. Theil. Alphabetisches Verzeichniß der Aussteller nebst Angabe ihrer Ausstellungsobjecte.