Essays about: "spårelement"

Showing result 11 - 15 of 16 essays containing the word spårelement.

  1. 11. Spårelement i Sveriges jordbruksmark : flöden, trender och fältbalanser

    University essay from SLU/Dept. of Soil and Environment

    Author : Per Knutson; [2011]
    Keywords : fältbalanser; balansberäkningar; spårelement; tungmetaller; tillförsel; bortförsel; förändringstakt;

    Abstract : Field balances based on supply and removal of trace elements from the topsoil have been calculatedfor farms specialized in crop, dairy and pig production in Sweden. Today's field balances have beencompared with the field balances of 1990 in order to examine if, and then how, the situation haschanged. READ MORE

  3. 12. Effects of biogas residues on respiration and denitrification in arable soil : evaluation of methods, microbial activity and agronomic implications

    University essay from SLU/Dept. of Microbiology

    Author : Erik Jönsson; [2011]
    Keywords : Biogas residue; Anaerobic digestion; Pig slurry; PDA; Respiration; Organic fertilizers; Biogas; Rötrest; Flytgödsel; Denitrifikation; Bördighet; Soil fertility;

    Abstract : Agricultural soils constitute the base in human food production and soil content of organic matter and plant nutrients together with soil microbial activity are all important parameters for high crop yield of good quality. These parameters are dependant on proper fertilization. READ MORE

  4. 13. On the occurrence of baddeleyite in zircon in silica-saturated rocks

    University essay from Lunds universitet/Geologiska institutionen

    Author : Alexander Lewerentz; [2010]
    Keywords : zircon; baddeleyite; silica-saturated rocks; scanning electron microscopy; energy dispersive x-ray spectroscopy; zirkon; baddeleyit; kiselmättade bergarter; svepelektronmikroskopi; röntgenemmissionspektroskopi; Earth and Environmental Sciences;

    Abstract : Baddeleyit (ZrO2) är ett viktigt mineral för U-Pb-geokronologi i kiselundermättade bergarter. Vid kiselövermättade förhållanden reagerar baddeleyit med kvarts för att bilda zirkon. Trots detta beskriver jag i denna uppsats baddeleyitdomäner inuti zirkoner från ett flertal kiselsövermättade bergarter. READ MORE

  5. 14. When did the Kalahari craton form? : constraints from baddeleyite U-Pb geochronology and geo-chemistry of mafic intrusions in the Kaapvaal and Zimbabwe cratons

    University essay from Lunds universitet/Geologiska institutionen

    Author : Nadine März; [2010]
    Keywords : geography; geology; Kalahari craton; baddeylite U-Pb geochronology; mafic intrusions; Kaapvaal craton; Zimbabwe craton; Earth and Environmental Sciences;

    Abstract : Nordost om Bushveldkomplexen i Kaapvaal kratonen finns en mäktig gångsvärm av nordost-orienterade diabasgångar tillhörande ”the Black Hills dyke swarm”. Med hjälp av U- Pb metoden av mineral baddeleyit daterades fem gångar inom ålderspannet 1.87 - 1.85 Ga, där två av dem ger exakta åldrar på 1852 ± 5 Ma och 1863 ± 7 Ma. READ MORE

  6. 15. A geochemical characterization of the lower part of the Miocene shield-building lavas on Gran Canaria

    University essay from Lunds universitet/Geologiska institutionen

    Author : Romina Peetz; [2009]
    Keywords : Gran Canaria; shield-building lavas; Güigüi Formation; Earth and Environmental Sciences;

    Abstract : Ocean islands offer a great potential to provide information about mantle processes and the composition of the mantle. Gran Canaria is located in the centre of the Canary Island Archipelago and is well suited for such studies. A comprehensive study of the lower Miocene shield-building lavas is performed for this thesis. READ MORE