MICRO

Main Functions

Cell wall synthesis; Cellular stretching; Membrane integrity; Carbohydrate transport; Fixing flowers

Absorbed Form

H₃BO₃ and H₂BO₃-

ION-Root Contact

Mass Flow

Deficiency

Slow development of growth points, which may die. New leaflets become small and deformed

Plant Mobility

Immobile

Source

Borax, Boric Acid, Octaborate

Observations

High soil mobility

Main Functions

IAA synthesis ; Protein synthesis; Nitrate Reduction; Structure and activity of enzymes (ex RubisCo).

Absorbed Form

Zn²⁺

ION-Root Contact

Diffusion

Deficiency

Young leaves are small and lanceolate, showing chlorosis between the veins

Plant Mobility

Not very mobile

Source

Zinc Oxide, Zinc Sulfate, Zinc Nitrate

Observations

High doses of phosphorus and liming decrease Zn availability

Main Functions

Protein Composition; Peroxidase and Catalase; N Fixation (Nitrogenase Enzyme)

Absorbed Form

Fe²⁺ and Fe³⁺

ION-Root Contact

Diffusion

Deficiency

Drop in protein synthesis

Plant Mobility

Not very mobile

Source

Ferrous sulfate, ferrous chloride, ferric nitrate

Observations

Excess Cobalt in the seed can cause deficiency

Main Functions

Photosynthesis (cofactor of a water photolysis enzyme); Perspiration; osmotic control

Absorbed Form

Cl^-

ION-Root Contact

Mass Flow

Deficiency

Wilting (control of stomatal closure) and Chlorosis

Plant Mobility

Mobile

Source

KCl; NH4Cl; CaCl2; MgCl2

Observations

Toxicity may occur with high doses of potassium chloride

Main Functions

Photosynthesis (water photolysis); Enzyme constituent and activator; Lignin Synthesis; Nitrite Reductase Cofactor

Absorbed Form

Mn²⁺

ION-Root Contact

Diusion and Root interception

Deficiency

Interveinal chlorosis in young leaves

Mobility

Not very mobile

Source

Manganese Sulfate, Oxide and Nitrate

Observations

It becomes unavailable with an increase in pH

Main Functions

Photosynthesis (Plastocyanin); BNF (Biological Nitrogen Fixation) Enzyme constituent and activator.

Absorbed Form

Cu²⁺

ION-Root Contact

Diffusion

Deficiency

Necrosis on the edges of the leaflets of young leaves. The color changes to bluish green.

Plant Mobility

Not very mobile

Absorbed Form

Sulfate, Nitrate and Copper Hydroxide; cuprous oxide

Observations

High levels of organic matter can make it unavailable

Main Functions

Nitrogen Metabolism (Nitrogenase and Nitrate reductase Enzymes)

Absorbed Form

MoO₄^2-

ION-Root Contact

Mass Flow

Deficiency

Chlorotic leaves, similar to Ndeficiency. In soybeans, it impacts low nodule activity BNF

Plant Mobility

Mobile

Source

Sodium, ammonium molybdates; molybdenum trioxide; molybic acid

Observations

The high concentration of sulfur in the soil promotes a reduction in Mo absorption. Reducing soil pH results in a decrease in Mo availability to plants

Main Functions

Constituent of enzymes (e.g. urease);increases the weight of soybean nodules

Absorbed Form

Ni²⁺

ION-Root Contact

Diffusion

Defficiency

Necrosis at the tips of the leaves due to the accumulation of urea in toxic concentrations. Chlorosis in young leaves.

Plant Mobility

Not very mobile

Source

Nickel Chloride, Nickel Sulfate (foliar)

Observations

High concentration of Nickel increases disease resistance in plants