# The Effects of Inorganic Nitrogen form and $$CO_2$$ Concentration on Wheat Yield and Nutrient Accumulation and Distribution

 Title: The Effects of Inorganic Nitrogen form and $$CO_2$$ Concentration on Wheat Yield and Nutrient Accumulation and Distribution Author: Carlisle, Eli; Myers, Samuel Skipworth; Raboy, Victor; Bloom, Arnold Note: Order does not necessarily reflect citation order of authors. Citation: Carlisle, Eli, Samuel Myers, Victor Raboy, and Arnold Bloom. 2012. The effects of inorganic nitrogen form and $$CO_2$$ concentration on wheat yield and nutrient accumulation and distribution. Frontiers in Plant Science 3:195. Full Text & Related Files: 3432492.pdf (621.5Kb; PDF) Abstract: Inorganic N is available to plants from the soil as ammonium ($$NH^+_4$$) and nitrate ($$NO^-_3$$). We studied how wheat grown hydroponically to senescence in controlled environmental chambers is affected by N form ($$NH^+_4$$ vs. $$NO^-_3$$) and $$CO_2$$ concentration (“subambient,” “ambient,” and “elevated”) in terms of biomass, yield, and nutrient accumulation and partitioning. Wheat supplied with $$NH^+_4$$ as a sole N source had the strongest response to $$CO_2$$ concentration. Plants exposed to subambient and ambient $$CO_2$$ concentrations typically had the greatest biomass and nutrient accumulation under both N forms. In general $$NH^+_4$$-supplied plants had higher concentrations of total N, P, K, S, Ca, Zn, Fe, and Cu, while $$NO^-_3$$-supplied plants had higher concentrations of Mg, B, Mn, and $$NO^-_3$$ - N. $$NH^+_4$$-supplied plants contained amounts of phytate similar to $$NO^-_3$$-supplied plants but had higher bioavailable Zn, which could have consequences for human health. $$NH^+_4$$-supplied plants allocated more nutrients and biomass to aboveground tissues whereas $$NO^+_3$$-supplied plants allocated more nutrients to the roots. The two inorganic nitrogen forms influenced plant growth and nutrient status so distinctly that they should be treated as separate nutrients. Moreover, plant growth and nutrient status varied in a non-linear manner with atmospheric $$CO_2$$ concentration. Published Version: doi:10.3389/fpls.2012.00195 Other Sources: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3432492/pdf/ Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10579045 Downloads of this work: