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Based on a long-term fertilization experiment on sandy soil, research concerning the effect of variable fertilization on the soil content of silicon extracted by CaCl2 solution was performed. The content of plant available silicon was evidenced to depend on the applied fertilization and soil properties. Plant silicon supply coefficient varied depending on the fertiliser combination. In the case of potatoes this coefficient was smaller then 1 but for oat was usually higher then one. It suggesting that the amount of available silicon in soil is sufficient to cover the nutritional needs of potatoes but not sufficient for oat.