Figure 5From: Depletion of the heaviest stable N isotope is associated with NH4+/NH3 toxicity in NH4+-fed plantsRoot ion contents of spinach plants. Root ion content (μmol g-1 DW) of plants transferred from pH 7 to pH 6 (○) or pH 9 (●). (A) Rb+ content. (B) NO3- content.Back to article page