@article{prochnow_van raij_kiehl_2002,  title={Effect of water and citrate solubility on agronomic effectiveness of acidulated phosphates in three consecutive corn crops},  volume={26},  ISSN={0100-0683},  url={https://doi.org/10.1590/S0100-06832002000300018},  DOI={10.1590/S0100-06832002000300018},  number={3},  journal={Revista Brasileira de Ciência do Solo},  publisher={Sociedade Brasileira de Ciência do Solo},  author={Prochnow, L. I. and van Raij, B. and Kiehl, J. C.},  year={2002},  month={Jul},  pages={729–736} }