**5. Conclusions**

The absorption of silicon in corn plants is influenced by the interaction of nitrogen and potassium. Application of Si combined with a high concentration of K causes an increase in K accumulation which is reflected in higher total dry biomass in corn plants. An excess and a deficit of N decrease the accumulation of Si in the aerial part of the plant, which is more evident at a low concentration of K in the nutrient solution, diminishing the accumulation of total dry biomass.
