@article{costa_silva_kern_ruivo_marichal_2017,  title={Forms of soil organic phosphorus at black earth sites in the Eastern Amazon1},  volume={48},  ISSN={1806-6690},  url={https://doi.org/10.5935/1806-6690.20170001},  DOI={10.5935/1806-6690.20170001},  number={1},  journal={Revista Ciência Agronômica},  publisher={Universidade Federal do Ceará},  author={Costa, Adriane da Rocha and Silva, Mário Lopes and Kern, Dirse Clara and Ruivo, Maria de Lourdes Pinheiro and Marichal, Raphaël},  year={2017},  month={Jan},  pages={1–12} }