Material for research was obtained from the field experiment conducted at the Experimental Station of Cultivar Testing in Chrząstowo (53°09’ N; 17°35’ E) in the years 2006-2008. Amino acid composition in the vegetation matter was determined after acid hydrolysis with high performance liquid chromatography (HPLC). High content of the total protein was found in the green matter. Profile analysis proved that protein of the analyzed species differs from each other in composition. However, it is characterized by a similar content of three exogenous amino acids (phenylalanine, isoleucine, valine) as well as two endogenous amino acids (alanine and serine). Chenopodium quinoa is distinguished from Chenopodium album by higher biological value of protein in the green matter, measured with the essential amino acid index (EAAI). The analyzed species are characterized by high yields of exogenous and endogenous amino acids in cultivation for green matter. Chenopodium quinoa as a crop plant is characterized by higher forage value than Chenopodium album. Small proportion of Chenopodium album in Chenopodium quinoa canopy will not significantly affect the change of quality of the produced green matter.

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