The Stem Density of Orchardgrass (Dactylis glamerata L.) Drilled into Kentucky Bluegrass (Poa pratensis L.) Sod Affected by the Seeding Time, Nitrogenous Fertilization and Post-sowing Trimming

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  • ケンタッキーブルーグラス(Poa pratensis L.)草床に追播したオーチャードグラス(Dactylis glolmerata L.)の茎数密度に及ぼす追播時期,窒素施肥及び播種後の刈払いの影響
  • ケンタッキーブルーグラス(Poa pratensis L.)草床に追播したオーチャードグラス(Dactylis glomerata L.)の茎数密度に及ぼす追播時期,窒素施肥及び播種後の刈払いの影響
  • ケンタッキーブルーグラス Poa pratensis L.ソウショウ ニ ハク

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An experiment was conducted to investigate the effects of three factors on the establishment of orchardgrass (Dactylis glomerate L.) by direct drilling into Kentucky bluegrass (Poa pratensis L.) sod at Kuju Agricultural Research Center of Kyushu University from August, 1986 to April, 1987. The factors were seeding time (Aug. 1, Sep. 1 and Oct. 1), nitrogenous fertilization (5 kgN/10 a of fast-release fertilizer, 5 kgN/10 a and 10 kgN/10 a of slow-release fertilizer) and post-sowing trimming frequency (none, once and twice). The seeds were sown in a groove of 6 cm depth and 8 cm width in the Kentucky bluegrass sod which had been established in a wooden box (37 × 58 × 23 cm). The results obtained were as follows : 1. Owing to the significantly higher seedling density two months after seeding, October seeding showed the highest stem density in the next spring (April 25) comparing with the other seeding times, although its overwintering rate of stems (the percentage of the number of stems on Feb. 25 to that on Nov. 30) was low. 2. The dressing of 5 kgN of slow-release fertilizer in August seeding was effective for more stems in spring. The treatment of 10 kgN of slow-release fertilizer application showed the highest overwintering rate of stems and stem density in the next spring in September seeding. With the low rate of application (5 kgN) of slow-release fertilizer, the increasing effects on the overwintering rate of stems and the stem density in the next spring were observed in October seeding. 3. In August seeding, post-sowing trimming significantly increased the relative light intensity in the sod, which increased the tillering in spring and the stem density in the next spring. The results suggested that October seeding with the application of slow release fertilizer of 5 kgN/10 a was the most effective for the establishment of orchardgrass by direct drilling into Kentucky bluegrass sward.

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