Fontes, P.C.R. and Ronchi, C.P. 2002. Critical values of nitrogen indices in tomato plants grown in soil and nutrient solution determined by different statistical procedures. Pesquisa Agropecuaria Brasileira. 37, 10 (Oct. 2002), 1421–1429. DOI:https://doi.org/10.1590/S1678-3921.pab2002.v37.6486.