Highly mobile in the plant. Mobile in the phloem. Found in seeds and fruit. Needed by plants to form urease which breaks down urea nitrogen for plant use. Involved in the utilization of iron from the soil.
Gives rise to chlorosis and necrotic leaf margins.
Needed by plants recently established. Essential for nitrogen fixation. Little is known about its deficiency or toxicity symptoms. See also Macronutrient Outline and general information on plant nutrition . This site was developed for the Arizona Cooperative Extension , College of Agriculture , The University of Arizona .