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Calcium is taken from the environment. In plant cells and tissues to be present in ionic form and the form of inorganic and organic combinations. Calcium cells fulfills a structural and functional role. Excess calcium green-sickness cause plant, due to the solubility and absorption of mineral compounds of iron, manganese.
See also
 Minerals
Potassium
Of all the elements, potassium is found in greatest quantity in plants, especially the young, in the form of inorganic salts. Potassium deficiency is felt more strongly on soils with high salt content of calcium and magnesium and poor aeration. External symptom of potassium deficiency is the leaf color change, that the appearance of brown spots, especially near the extremities of the leaf. Iron
Iron must be present in the soil in a form assimilable otherwise occurs deficiency manifested by green-sickness. Iron deficiency is associated with a yellowing of leaves. Phosphorus
Phosphorus is found in soil as organic and inorganic compounds. Soil organic phosphorus comes from the decomposition of organic residues from crop residues or organic fertilizers. Sodium
Sodium plays a well defined role in vascular bands and fibers that support the plant tissue. Halophile plants, adopted an environment with high concentrations of sodium, this element is necessary for growth, give a better color of the leaves, increases disease resistance. |
 
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