Deficiency of micronutrients in soils of arid and semi-arid regions (alkaline and calcareous soils) forms one of the major yield limiting factors and can greatly disturb plant yield and quality. Micronutrients availability in these soils is limited due to high pH, low organic matter, high calcium and magnesium, carbonate and bicarbonate contents. Soil application of micronutrients is very expensive under the prevailing soil conditions. The availability of added micronutrients to these soils is affected by the soil and environmental factors. Except Mo, most of micronutrients are readily fixed...