@article{pôrto_alves_souza_araújo_arruda_2008,  title={Nitrate production and accumulation in lettuce as affected by mineral Nitrogen supply and organic fertilization},  volume={26},  ISSN={0102-0536},  url={https://doi.org/10.1590/S0102-05362008000200019},  DOI={10.1590/S0102-05362008000200019},  number={2},  journal={Horticultura Brasileira},  publisher={Associação Brasileira de Horticultura},  author={Pôrto, Mônica L and Alves, Jailson do C and Souza, Adailson P de and Araújo, Raunira da C and Arruda, Jandeilson A de},  year={2008},  month={Apr},  pages={227–230} }