GEOG 317 Lecture Notes - Desorption, Denitrification, Chlorophyll
16 Dec 2012
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Starts with structural framework where primary minerals and organic matter avail slowly. Colloidal fraction makes clay and humus slowly avail. Adsorbed fraction allows ions held on colloidal surface to be moderately avail. Soil solution fraction=ions freely move and adsorbed by plant roots by diffusion. 2 types of major soil nutrients: macronutrients- chemical elements necessary in large amounts for plant growth. From air and water- cho, from soil solids- p,k,n,ca micronutrients- chemical elements necessary in extremely small amounts for plant growth. Fe, mn, cl, b, co, cu, zn fertilizers- animal manure, chemical fertilizers n- urea, p-rock phosphate, k- from mining underground salt. N is gained through biological and industrial fixation lost through denitrification, leeching, erosion transformed by plants, animals, humans, soil organisms. Mineralization- conversion of organically bound n into inorganic form. Wide variety of soil organisms simplify and hydrolyze organic nitrogen compounds. Immobilization- conversion of inorganic n ions into organic forms.
