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Light and Heavy Turfgrass Seeds Differ in Germination Percentage and Mean Germination Thermal Time

^a Forest and Landscape Denmark, Rolighedsvej 23, DK-1958 Frederiksberg C, Denmark
^b Dep. of Agricultural Sciences, Royal Veterinary and Agricultural Univ., Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark

View larger version (25K): [in a new window]   Fig. 1. Cumulative distribution of 1000-seed weight (TSW) within a seed lot of red fescue, perennial ryegrass, and Kentucky bluegrass, respectively. Lines indicate a normal distribution fitted according to Eq. [1].

View larger version (32K): [in a new window]   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.

View larger version (33K): [in a new window]   Fig. 3. Relationship between 1000-seed weight (TSW) and mean germination time (MGT) 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. [5] (see parameter estimates in Table 3). Broken lines indicate linear functions, fitted according to Eq. [7] (see parameter estimates in Table 5). Note that the scale on y axis differs among species.

View larger version (17K): [in a new window]   Fig. 4. Relationship between 1000-seed weight (TSW) and mean germination thermal time (MGTT) for seed weight fractions of red fescue, perennial ryegrass, and Kentucky bluegrass germinated at two temperature regimes. Lines indicate linear functions, fitted according to Eq. [9] (see parameter estimates in Table 6). Note that the scale on y axis differs among species.

View larger version (32K): [in a new window]   Fig. 5. Relationship between proportion of seed lot removed and germination percentage and mean germination time (MGT), respectively, at two temperature regimes for seed lots of red fescue, perennial ryegrass, and Kentucky bluegrass. The germination percentage and MGT are calculated as weighted means of the remaining seeds in the seed lots, when the lightest seeds are successively excluded.