Indagine sul contenuto di nitrati, colore e consistenza in verdure da taglio del Friuli-Venezia Giulia ottenute con varie tecniche colturali

Known data relative to nitrate levels in leaf vegetables can hardly be compared. In fact, results may be influenced by a large number of parameters (temperature, brightness, types and amounts of fertilizers and/or manure employed in soils, characteristics and composition of irrigation water and/or of nutritive solutions used for basin growing, variety of vegetable grown, etc.). All these parameters play an important role as far as plant metabolism is concerned and therefore may significantly influence nitrate heap. Our research has been carried on for two years in a row; nitrate levels, color and firmness have been determined in wild rocket and leaf lettuce grown by employing different techniques in some farms of the Friuli Venezia Giulia region. Furthermore, total N, total P and total K have been determined in samples of soils and of nutritive solutions.