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Abstract
Wheat, barley and oat plants, grown in the absence of added Ni (‐Ni), accumulated 15 to 20 fold higher levels of urea in their leaf tips than Ni supplied plants (+Ni). Oat plants (‐Ni) matured 15 days earlier than +Ni‐oat plants. When grown from low Ni seed, Ni‐deprived barley plants had significantly (30%) lower root and shoot weights than +Ni‐plants and displayed characteristic symptoms that could be eliminated by Ni supplementation. Tissue Fe‐levels were positively correlated with tissue Ni‐levels.