A field experiment investigated foliar application of manganese, copper and zinc sulphates, ammonium molybdate, borax and the gama micro-chelate on the potato tuber protein content and quality. There was noted a significant effect of potato foliar fertilisation with microelements on the amino acid content in tubers. The protein quality evaluated with the amino acid composition increased with the foliar application of boron, copper and manganese. The foliar fertilisation with microelements, especially boron, zinc, copper and manganese, increased the content of methionine in tuber protein, and, as a result, the quality was most limited by isoleucine.

73-82