[Effectiveness of mineral fertilizers at different methods of soil tillage under conditions of periodically leaching regime in the south of Oka-Don plain [Russian Federation]]

azote chernozem chernozems contenido proteico crop yield cultivos de invierno culture d'hiver fertilidad del suelo inorganic fertilizers labranza mineralisation mineralization nitrogen pisum sativum protein content rendement des cultures rendimiento de cultivos rotation culturale rotational cropping russian federation soil fertility soil water regimes tillage travail du sol triticum aestivum winter crops