@article{fontes_ronchi_2002,  title={Critical values of nitrogen indices in tomato plants grown in soil and nutrient solution determined by different statistical procedures},  volume={37},  ISSN={0100-204X},  url={https://doi.org/10.1590/S0100-204X2002001000010},  DOI={10.1590/S0100-204X2002001000010},  number={10},  journal={Pesquisa Agropecuária Brasileira},  publisher={Embrapa Secretaria de Pesquisa e Desenvolvimento; Pesquisa Agropecuária Brasileira},  author={Fontes, Paulo Cezar Rezende and Ronchi, Cláudio Pagotto},  year={2002},  month={Oct},  pages={1421–1429} }