The effect of repeated nitrogen fertilization on microbial conditions in the soil under spruce stand

agricultural chemicals ammonium compounds ammonium nitrate arbre arbre brise-vent arbre forestier arbre pour bois de construction bacteria biologia biologie biologie du sol biology building materials calcaire carbon dioxide composition compuestos de amonio conifere conifers crops cultivos cultural soil types dioxyde de carbone ecological soil types economic plants engrais environment environnement fertilizantes nitrogenados fertilizers fisiologia fonction physiologique forest soils forest trees gases gaz gimnospermas gymnosperme gymnosperms inorganic compounds limestone medio ambiente metabolism metabolisme metabolismo nitrate d'ammonium nitrato de amonio nitrogen fertilizers nitrogen metabolism organic compounds organic nitrogen compounds oxides oxyde physical states physiological functions physiologie physiology picea picea abies piedra caliza pinaceae plantas plantas protectoras plante plante de culture plante de protection plante pour construction plants produit agrochimique protective plants roca roche rock sales salts sel site factors soil biology soil types structural crops suelo forestal timber trees trees type de sol type de sol de culture urea uree windbreak trees