Abstract
The present study is focused on the changes in chemical composition of potato tubers (14 varieties) affected by increased doses of nitrogen fertilizers. Intensified nitrogen fertilization decreased the content of dry matter and starch in potato tubers. Moreover, it increased nitrogen content in dry matter and in non-starch dry substance of the potato tubers. Nitrogen fertilization also increased the content of protein nitrogen in dry matter of potato tubers but decreased its contribution to total nitrogen. Nitrogen fertilization consequently increased the content of amide and amino acid nitrogen in potato dry matter and total nitrogen. Increased levels of nitrogen fertilizers were followed by an increase in amino acid content determined in the hydrolyzates of raw potato flesh. No effect of nitrogen fertilization on essential amino acids in conversion to crude protein has been observed.
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