The effect or botanical composition of six spring grain (wheat, triticale) + legume (peas, vetch, and field peas) mixture, with variable contribution of legume plants (15 and 30%) on grain and seed yield and its amino acid composition, was studied in the years 1990-1992. A negative relationship between yielding of mixtures and actual contribution of legume plants, and a positive one, between contribution or legume plants to total yield and total protein content in the yield, were found. The highest yield was recorded for the mixture of wheat + vetch (5.67 ha^-1 ; with 1.24% vetch), and the lowest for the mixture of triticale + held peas (4.70 t ha^-1 ; with 5,95% field peas). Variable contribution or legume plants to the mixtures (15 and 30%) had no significant effect on grain and seed yield nor on protein yield. In contrast, the weather affected significantly grain and seed yield and protein yield of (he mixtures. The most favourable and the least favourable year was 1990 and 1992, respectively. The highest values of chemical score (CS) and exxential amino acid index (EAAI) were obtained for the mixtures of triticale + field peas. The protein of these mixtures was characterized by a high content of Lys, lie and Thr.
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