Figure 6.

Relationships among maize production, environmental impacts, human health impacts, and economic performance under different N treatments. The environmental impacts include global warming potential, eutrophication potential, acidification potential, and energy depletion potential. The economic performance includes private profitability, ecosystem economic benefit, and integrated compensation benefit. CK, no N; Opt. N*50–70%, 50–70% of optimal N rate; Opt. N, optimal N rate; Opt. N*130–150%, 130–150 % of optimal N rate; Con. N, conventional N rate.