Boldrini, Arianna; Benincasa, Paolo; Tosti, Giacomo; Tei, Francesco and Guiducci, Marcello (2007) Apparent N Balance in Organic and Conventional Low Input Cropping Systems. Poster at: 3rd QLIF Congress: Improving Sustainability in Organic and Low Input Food Production Systems, University of Hohenheim, Germany, March 20-23, 2007.