Table 1: Primary forms of some nutrients intake by plants.

ElementsSymbolsForms used by plants

NitrogenN and
PhosphorusP and
PotassiumKK+
CalciumCaCa2+
MagnesiumMgMg2+
IronFeFe2+ and Fe3+
ManganeseMnMn2+
ZincZnZn2+
CopperCuCu2+
MolybdenumMo
NickelNiNi2+
SodiumNaNa+