Influence of variety and sulfur fertilization on the contents of crude protein, and selected amino acids in blue lupins (Lupinus angustifolius L.)

Summary

Legumes are the most important nitrogen suppliers in organic farming, have positive effects in crop rotation and are important protein feedstuffs. In 100 % organic feeding, the amino acid (AA) supply of feedstuffs is of increasing interest. The first- and second-limiting AAs for swine and poultry are lysine (Lys) and the sulfur-containing AAs (SAAs), methionine (Met) and cysteine (Cys), respectively. Since SAAs are limiting in the diet of monogastrics and, besides tryptophane, also in grain legumes, it was meant to examine, if sulfur (S) fertilization could increase the SAA contents in blue lupines (L. angustifolius L.) and if it affects the Lys content in different varieties.