. The Canadian field-naturalist. 40 60 80 Saod Age (MonltB). Sead Age (Uonltn) Figure 2. Regression lines for total germination (%) and degree-days to 50% of final germination (base tem- perature is 0°C) for the Eagle Hills, Kemen Prairie and Sonningdale collections of Plains Rough Fescue seeds collected in central Saskatchewan in 1988. Each symbol (solid squares for total germination and open squares for degree-days to 50% of final germination) is the mean of 16 replicates and verti- cal bars are 95% confidence limits. Germination was essentially nil at 91 and 80 months for the 1987 and 1988
. The Canadian field-naturalist. 40 60 80 Saod Age (MonltB). Sead Age (Uonltn) Figure 2. Regression lines for total germination (%) and degree-days to 50% of final germination (base tem- perature is 0°C) for the Eagle Hills, Kemen Prairie and Sonningdale collections of Plains Rough Fescue seeds collected in central Saskatchewan in 1988. Each symbol (solid squares for total germination and open squares for degree-days to 50% of final germination) is the mean of 16 replicates and verti- cal bars are 95% confidence limits. Germination was essentially nil at 91 and 80 months for the 1987 and 1988 collections, respec- tively. Sixty-seven to 94% of the variability associat- ed with total germination was accounted for by seed age (Table 1). Degree-days to 50% of final germination in all Table 1. Regression equations describing correlation of seed age with total germination and degree-days to 50% of final germination for seven collections of Plains Rough Fescue. Year and Collection Regression Equation R2 Total Germination (%) 1987 Allan Hills Kemen Prairie Strawberry Hills Radisson 1988 Eagle Hills Kemen Prairie Sonningdale Y^='' Y= Y= Y= Y= Y= Y= Degree-days to 50% of final germination 1987 Allan Hills Kernen Prairie Strawberry Hills Radisson 1988 Eagle Hills Kemen Prairie Sonningdale Y^= Y= Y= Y= Y= Y=228-^ Y= ^Y is total germination (%). ''X is seed age in months. "^Y is degree-days to 50% of final germination (base tem- perature is 0°C). collections increased linearly as seeds aged with 61 to 87% of the variation accounted for by seed age (Figures 1-7, Table 1). For each month that seeds were stored, about to degree-days were required to reach 50% of final germination. When first tested, the 1987 collections required 221-247 degree-days to reach
Size: 2004px × 1246px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorottawafi, bookcentury1900, bookdecade1910, bookyear1919
