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  Section: Plant Nutrition » Micronutrients » Nickel
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Physical & Chemical Properties of Nickel and Its Role

Discovery of the Essentiality of Nickel
Physical and Chemical Properties of Nickel and Its Role in Animal and Bacterial Systems
  Nickel-Containing Enzymes and Proteins
  Essentiality and Function of Nickel in Plants
  Influence of Nickel on Crop Growth
Diagnosis of Nickel Status
  Symptoms of Deficiency and Toxicity
Concentration of Nickel in Plants
Uptake and Transport
Nickel in Soils
  Nickel Concentration in Soils
  Nickel Analysis in Soils
Nickel Fertilizers

Nickel is a first-row transition metal with chemical and physical characteristics ideally suited to biological activity (18). Divalent nickel is the only oxidation state of nickel that is likely to be of any importance to higher plants. Nevertheless, Ni2+ forms a bewildering array of complexes with a variety of coordination numbers and geometries (19). Nickel readily binds, complexes, and chelates a number of substances of biological interest and is ubiquitous in all biological systems. Nickel is now known to be a functional constituent of seven enzymes, six of which occur in bacterial and animal systems, but not known to be active in plants, but the seventh enzyme, urease, is widely distributed in biology. The sensitivity of known biological nickel–complex equilibriums to temperature, concentration, and pH also make nickel an ideal element for the fine control of enzyme reactions (18).


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