Abstract
The ability of seven Kentucky bluegrass (Poa pratensis L.) cultivars to compete against annual bluegrass (Poa annua L.) under greenhouse and growth chamber conditions was evaluated. Under natural long days from June to November in the greenhouse and under a 15-h daylength in the growth chamber, annual bluegrass produced significantly more tillers than each of the Kentucky bluegrass cultivars. Under short day condition (10 h) in the growth chamber, the number of innovations produced by Sydsport Kentucky bluegrass was not significantly different from annual bluegrass. Under natural daylength of February and March in the greenhouse, the number of innovations produced by Baron, Glade and Sydsport Kentucky bluegrass cultivars was not significantly different from that produced by annual bluegrass. A method to evaluate the competitive ability of Kentucky bluegrass under daily 2-cm mowing height is described.
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