The Edaphology Unit of the María de Maeztu Excellence Unit-Department of Agronomy (Dauco) publishes the ideal ratio of phosphorus to zinc in soil for adequate fertilization of corn grown on zinc-deficient soils. Zinc deficiency along with vitamin A deficiency is the most widespread in the world population (Cakmak, McLaughlin and White, 2017). One of the causes is that the cereals that are consumed tend to have a low level of this mineral. The reason is that calcareous soils, very present in the Mediterranean environment, tend to have a high zinc deficiency, leading to negative effects on plant growth and, therefore, on the food that reaches the consumer. In order to solve the problem of zinc deficiency, the Edaphology Unit began a few years ago to study the consequences of this deficiency on cereals.
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