@misc{indiciae44b6930f5d9e,
  title = {Biochar effect on maize yield and soil characteristics in five conservation farming sites in Zambia},
  author = {Gerard Cornelissen and Vegard Martinsen and Victor Shitumbanuma and Vanja Alling and Gijs D. Breedveld and David W. Rutherford and Magnus Sparrevik and Sarah E. Hale and Alfred Obia and Jan Mulder},
  year = {2013},
  doi = {10.3390/agronomy3020256},
  url = {https://pubs.usgs.gov/publication/70176301},
  note = {Source identifier: 70176301}
}