@article{ludwig_fernandes_mota_bôas_2013,  title={Electrical conductivity and pH of the substrate solution in gerbera cultivars under fertigation},  volume={31},  ISSN={0102-0536},  url={https://doi.org/10.1590/S0102-05362013000300003},  DOI={10.1590/S0102-05362013000300003},  number={3},  journal={Horticultura Brasileira},  publisher={Associação Brasileira de Horticultura},  author={Ludwig, Fernanda and Fernandes, Dirceu M and Mota, Poliana RD and Bôas, Roberto L Villas},  year={2013},  month={Jul},  pages={356–360} }