Fig. 2. Relationship between 1000-seed weight (TSW) and germination percentage at two temperature regimes for seed weight fractions of red fescue, perennial ryegrass, and Kentucky bluegrass. Full lines indicate nonlinear functions, fitted according to Eq. [4] (see parameter estimates in Table 2). Broken lines indicate linear functions, fitted according to Eq. [6] (see parameter estimates in Table 4). Note that the scale on y axis differs among species.