Daniel T. Walters

TL;DR: The global challenge of meeting increased food demand and protecting environmental quality will be won or lost in cropping systems that produce maize, rice, and wheat as discussed by the authors, and the research agenda and developing effective policies to meet this challenge requires quantitative understanding of current levels of N-use efficiency and losses in these systems, the biophysical controls on these factors, and the economic returns from adoption of improved management practices.

TL;DR: The magnitude of the scientific challenge should not be underestimated because it becomes increasingly difficult to control the fate of N in cropping systems that must sustain yield increases on the world's limited supply of productive farm land.

TL;DR: In this paper, the effect of water-filled pore space (WFPS), available C, and soil NO₃ concentration on total denitrification (N₂ + NO), using acetylene inhibition, was investigated.

TL;DR: In this paper, the authors evaluate the potential for conserving natural resources while meeting increased demand for cereals, and conclude that avoiding expansion of cultivation into natural ecosystems, increased nitrogen use efficiency, and improved soil quality are pivotal components of a sustainable agriculture that meets human needs and protects natural resources.

TL;DR: In this paper, a comprehensive summary and interpretation of these interactions with specific emphasis on high yield environments is lacking. But the results from many N fertilization studies are often confounded by insufficiently optimized BNF or other management factors that may have precluded achieving BNF-mediated yields near the yield potential ceiling.