@article{quaggio_mattos junior_boaretto_2011,  title={Sources and rates of potassium for sweet orange production},  volume={68},  ISSN={0103-9016},  url={https://doi.org/10.1590/S0103-90162011000300015},  DOI={10.1590/S0103-90162011000300015},  number={3},  journal={Scientia Agricola},  publisher={Escola Superior de Agricultura "Luiz de Queiroz"},  author={Quaggio, José Antonio and Mattos Junior, Dirceu and Boaretto, Rodrigo Marcelli},  year={2011},  month={May},  pages={369–375} }