A new report in Science provides a textbook example of how plants can either be good at growing (taking advantage of nutrient resources) or be good at resisting herbivores, but not both. The experiment was conducted by comparing growth and herbivory on 16 species of milkweed. The article is by Mooney et al. and there is a perspectives article as well.
A paper I found today on DON uptake by plants. Good summary of N processing by soil microbes.
Jones, D.L., J.R. Healey, V.B. Willett, J.F. Farrar and A. Hodge “Dissolved organic nitrogen uptake by plants—an important N uptake pathway?” Soil Biology & Biochemistry 37:413-423.