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- Author or Editor: Grant E.M. Matheke x
- HortScience x
Seeds of three Sanguisorba species native to Alaska were germinated in growth chambers with constant air temperatures of 5°, 10°, 15°, 20°, 25°, or 30°C and an irradiance of 150 μM·m–1·s–2 for an 18-hr photoperiod to identify optimum germination in relation to temperature and light. Four replicates of 100 seeds each were sown onto filter paper in petri dishes in each temperature treatment. At 20°C, four additional dishes per species were enclosed in foil to exclude light. Dishes were arranged at random by species in large clear plastic bags, and daily counts of radicle emergence were recorded. Germination of all three species was fitted to third-order polynomial equations by regression analysis. The predicted optimum germination temperature for Sanguisorba officinalis was 25°C; S. menziesii was 24°C; and S. stipulata was 25°C. Germination was most rapid (days to 50% germination) for each species in the 25°C treatment. S. stipulata did not germinate at 5°C, and both S. stipulata and S. menziesii showed less than 50% germination at 30°C. Seeds of all species germinated as well in darkness as in light.
Yields of `Quinault' everbearing strawberries were compared during three seasons for plants grown under eight different mulch treatments with or without polyethylene row covers. In 1987, yields using clear polyethylene mulch with or without row covers (3.81 kg/m2 and 3.45 kg/m2, respectively) were significantly greater than all other mulch, treatments. Yields ranged from 1.05 kg/m2 to 2.60 kg/m2 for black polyethylene; black over white two-sided, embossed polyethylene; black latex liquid; permeable landscape fabric; white over black two-sided, embossed polyethylene mulch, all with row covers or the unmulched control plot without a row cover. During the second year, yields using clear polyethylene mulch were significantly greater than all treatments except for black polyethylene (5.32 kg/m2 and 4.74 kg/m2, respectively). Yields for the other mulch treatments ranged from 3.55 kg/m2 to 3.85 kg/m2. The summer of 1988 was warmer than average which may account for the improved performance of the black polyethylene mulch. In 1989 results were similar to 1987 in which the clear polyethylene mulch had significantly higher yields (5.66 kg/m2) than all other mulches (2.12 - 4.31 kg/m2). Clear polyethylene mulch with or without row covers is recommended for everbearing strawberry production in Alaska,