Nickel Deficiency

Nickel was long considered as non-essential or toxic, but work on a variety of crops reveals it to be directly related to plant health. The essential metalloenzyme, urease, contains Ni, which is involved in symbiotic N fixation. Sprays with Ni salts are also effective against rust infection in cereals. Nickel deficiency can either be a result of low availability in soil, or could be induced by several factors, including: high contents of Ca, Mg, Cu, or Zn;
availability decreases with excessive application of lime, when pH is raised above 6.5; high soil P limits availability either in the soil or within the plant itself; or nematodes can damage the root system and lead to severe deficiency.

Symptom Description — Nickel deficiency can lead to the accumulation of urea, which causes necrotic spots on the leaves. Pecan and other crops can show peculiar ‘mouse-ear’ symptoms where tips of affected young leaves have dark spots and are rounded, resembling the ear of a mouse. Cereals show interveinal chlorosis in young leaves and stunted foliage.

Nickel Deficiency in Video