Autumn growth and seed-producing capacity of tillers of Poa pratensis "Levang" and "Leikra"
1996
Aamlid, T.S. (Planteforsk - Norsk Inst. for Planteforskning, Apelsvoll Forskingssenter, Grimstad (Norway). Avd. Landvik)
Plant height, tillering, leaf development, dry weight and rhizome formation of Poa pratensis L. were monitored in spaced plant trials at Landvik (58 degrees N) at fortnightly intervals during the autumn of 1987 and at monthly intervals during the autumn of 1988. The 1988 experiment also included labelling of tillers on 1 September, 1 October and 1 November in order to determine which tillers would produce panicles the following year. Compared with the subarctic cv. Lavang (origin 69 degrees N), plants of the temperate cv. Leikra (origin 61 degrees N) were taller and their height growth less influenced by sampling date. In both cultivars vigorous tillering and rhizome formation continued until the last sampling on 15 October 1987 and 1 November 1988, and there was no indication of a period with reduced tillering but with growth of already existing tillers. While 47-55 of the late summer and autumn-formed tillers of 'Lavang' developed panicles irrespective of month of formation, fertility in 'Leikra' decreased from 75 for tillers formed before September to 65 for tillers formed in September and 52 for tillers formed in October. In the latter cultivar, intravaginal tillers also had a much lower fertility rate (average:48) than tillers developed from rhizomes (average: 70). The results are discussed in relation to primary induction requirements and light competition in the two cultivars.
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