Studies on the transformation of added ammonium under submerged condition in some soils of West Bengal [soil types, irrigated soils, rice]

agricultural chemicals ammonium compounds ammonium sulphate anthropogenic soil types arroz asia asie cereales cereals chemicophysical properties compuestos de amonio crops cultivos cultivos de grano cultural soil types drainage drenaje economic plants engineering engrais environment environnement fertilizantes nitrogenados fertilizers fisiologia fixation de l'azote flooded rice fonction physiologique grain crops hydraulic engineering inde india irrigated soils manejo del suelo medio ambiente mise en valeur du sol nitrogen fertilizers nitrogen fixation organic compounds organic nitrogen compounds paddy soils physiological functions physiologie physiology plantas plante plante de culture plants produit agrochimique rice riz riz aquatique site factors soil management soil physicochemical properties soil types suelo irrigado sulfato de amonio type de sol type de sol de culture