Title: Too much or not enough: Agronomic phosphorus balances across the world's croplands

Authors: MacDonald, G. K., E. M. Bennett, N. Ramankutty, and P. Potter

Citation: MacDonald, G. K., E. M. Bennett, N. Ramankutty, and P. Potter. 2011. Too much or not enough: Agronomic phosphorus balances across the world's croplands. Proceedings of the National Academy of Sciences 108 (7): 3086-3091.