Tomatoes and peppers are crops grown in seedlings. Optimal soils for growing these crops are light at granulometric composition with high organic content and a reaction close to neutral. The mineral nutrition of planted plants is conditionally divided into 2 periods. The first is vegetative (from planting of seedlings to the final formation of biomass) requires a balanced supply of macro-elements. The second one is generative (from the appearance of the first flowers to the ripening of the fruits) when the plants need adequate supply of potassium, calcium, magnesium and trace elements: boron, zinc, manganese, copper. The importance of trace elements in tomato and pepper nutrition lies in their impact on the health of plants and the quality of the crop.