The majority of the micronutrients are not mobile in the plant. Deficiency symptoms are usually found on new growth. Their availability in the soil is highly dependent upon the pH and the presence of other ions. The proper balance between the ions present is important as many micronutrients are antagonistic to each other. This is especially true of the heavy metals where an excess of one element may show up as a deficiency of another. If the pH is maintained at the proper level and a fertilizer which contains micronutrients is used once a year deficiency symptoms (with the exception of iron deficiency symptoms) are rarely found on indoor plants. Many of the micronutrients are enzyme activators.
Absorbed as Fe++, Fe+++.
Interveinal chlorosis primarily on young tissue, which may become white and devoid of chlorophyll.
Rare except on flooded soils.
Absorbed as BO3-
Blackening or death of tissue between veins.
Failure to set seed, internal breakdown, death of apical buds.
Absorbed as Zn++.
Appears as Fe deficiency. Interferes with Mg.
"Little leaf," reduction in size of leaves, short internodes, (rosetting) distorted or puckered leaf margins, interveinal chlorosis.
Absorbed as Cu++, Cu+.
Can occur at low pH. Shows up as Fe deficiency.
New growth small, misshapen, wilted. May be found in some peat soils, (potting soils).
Absorbed as Mn++.
Reduction in growth, brown spotting on leaves.
Interveinal chlorosis of leaves followed, by brown spots producing a checkered red effect.
Absorbed as MoO4-.
Interveinal chlorosis on older or midstem leaves, twisted leaves (whiptail).
Absorbed as Cl-.
Wilted leaves which become bronze then chlorotic then die; club roots.
Salt injury, leaf burn, may increase succulence.
Absorbed as Ni++.
Decreases utilization of iron.
Gives rise to chlorosis and necrotic leaf margins.
Absorbed as Co++.
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