Comparative study of morphological traits and productivity of alfalfa (Medicago media Pers) cultivated in pure sowing and in mixture with papilionaceous plants and grasses. Part II. Relationship between morphological traits of papilionaceous in l -st cutting

Plant samples at the and of 1-st cutting were collected from field experiment or from teaching collection in order to determine the degree of relationship of in pairs of traits. The degree of the relationship between investigated was estimated by linear or curvilinear regresion and only equations for which coeficient of determination R2 was greated than 0.5 were reported in the paper. Leave surface area from steams of compared species of papilionaceous depended to small degree on the shave of small leaves in this feature ( bird's foot trefoi1-15,2 > red clover-7,9 > sainfoin-5,1. Between the mass of the steam of single species and its length curvilinear relation was observed, which informs about above average influence of longer steams (>70 cm) on yield. Plant mass was poorly correlated with the total steam length. Among single plants (small, average, large) significant differences were observed in the mass of single steams. Share of separated groups of steams in the mass of tops varied greatly and was following: 25% of largest steams decided about the half of its yield. In turn 50% of steams (small and very small) formed only 25% of top yield