Iron deficiency is common for peaches and other fruits grown on highly alkaline irrigated soils of arid regions, even though these soils are quite high in iron. How do you account for this situation,...

Iron deficiency is common for peaches and other fruits grown on highly alkaline irrigated soils of arid regions, even though these soils are quite high in iron. How do you account for this situation, and what would you do to alleviate the difficulty?

Give an example of a fungal-caused plant disease that can be effectively reduced by fertilizing with a micronutrient. Name the micronutrient and explain why it helps control the disease.