Boxplots showing the concentration of K, P, Ca, Mg, Fe, Mn, B, and Zn in leaves of various crop species. WatanabeToshihiro MaejimaEriko YoshimuraTomoko UrayamaMasaru YamauchiAiko OwadanoMasako OkadaRyosuke OsakiMitsuru KanayamaYoshinori ShinanoTakuro 2016 <p>Concentrations in nonedible leaves are also shown. Numbers in x-axis indicate the species number in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0160273#pone.0160273.t001" target="_blank">Table 1</a>.</p>