@article{chalk_2016,  title={From production to consumption: tracing C, N, and S dynamics in Brazilian agroecosystems using stable isotopes},  volume={51},  ISSN={0100-204X},  url={https://doi.org/10.1590/S0100-204X2016000900003},  DOI={10.1590/S0100-204X2016000900003},  number={9},  journal={Pesquisa Agropecuária Brasileira},  publisher={Embrapa Secretaria de Pesquisa e Desenvolvimento; Pesquisa Agropecuária Brasileira},  author={Chalk, Phillip Michael},  year={2016},  month={Sep},  pages={1039–1050} }