Multi-analytical techniques to study changes in carbon and nitrogen forms in a tomato-cultivated soil treated with biochar and biostimulants oleh Ivano Vassura, Daniele Fabbri, Alessandro G. Rombolà, Beatrice Rizzi, Arianna Menichetti, Sandro Cornali, Luca Pagano, Roberto Reggiani, Maria R. Vecchi, Nelson Marmiroli