The effect of meadow drainage and ploughing on nitrogen conversion in acid brown forest soil

abonos abonos verdes agricultural chemicals amendement du sol arable soils aradura biologia biologie biologie du sol biology composition crops cultivation cultivo cultivos cultural soil types drainage drenaje economic plants engineering engrais engrais organique engrais vert enmiendas del suelo environment environnement facteur de production fertilizers fisiologia fonction physiologique grazing lands green manures humus hydraulic engineering labour labranza land manejo del suelo medio ambiente metabolism metabolisme metabolismo methode methods mise en valeur du sol nitrogen metabolism organic matter organic matter content pastizales pastures physiological functions physiologie physiology plantas plante plante de culture plants ploughing pratique culturale production factors produit agrochimique site factors soil amendments soil biology soil management soil types sol arable terre tierras tierras cultivables tierras de pastoreo tillage travail du sol type de sol type de sol de culture