@misc{indiciae4fe2a0b8c840,
  title = {Nitrogen requirement.},
  author = {G E Butterfield-Hodgdon and D H Calloway and F Costa},
  year = {1977},
  doi = {10.1016/s0140-6736(77)91190-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/64909/},
  note = {Source identifier: 64909}
}