Germination Time of Digitariaadscendens (H.B.K.) Henr. and Echinochloa crus-galli (L.) Beauv. as Influenced by Bare Ground or by Covering with Dactylis glomerata L. and its Cutting Treatments

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  • IKEDA Kentaro
    Division of Bioresource and Bioenvironmental Sciences, Kyushu University
  • GOTO Takafumi
    Kuju Agricultural Research Center, University Farm, Faculty of Agriculture, Kyushu University
  • TOBISA Manabu
    Division of Bioresource and Bioenvironmental Sciences, Kyushu University
  • SHIMOJO Masataka
    Division of Bioresource and Bioenvironmental Sciences, Kyushu University
  • MASUDA Yasuhisa
    Division of Bioresource and Bioenvironmental Sciences, Kyushu University

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Other Title
  • 地表部の植被と刈取りがメヒシバ(Digitaria adscendens (H.B.K.) Henr.)とイヌビエ(Echinochloa crus-galii (L.) Beauv.)種子の発芽時期に及ぼす影響
  • 地表部の植被と刈取りがメヒシバ(Digitaria adscendens (H.B.K.) Henr.)とイヌビエEchinochloa crus-galli (L.) Beauv.)種子の発芽時期に及ぼす影響
  • チヒョウブ ノ ショクヒ ト カリトリ ガ メヒシバ Digitaria adscendens H B K Henr ト イヌビエ Echinochloa crus galli L Beauv シュシ ノ ハツガ ジキ ニ オヨボス エイキョウ

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Abstract

Studies were carried out in the central highland area of Kyushu to observe the germination of Da (Digitaria adscendens (H.B.K.) Henr.) and EC (Echinochloa crus-galli (L.) Beauv.) as influenced by vegetation and cutting management. We made three-treatments plots using containers ; the plot without plant (bare ground plot), the plot planted with stubbles ofDactylis glomerata L. with cutting two times on July 4. and Aug. 15. (cutting plot) and without cutting (no cutting plot). The number of seedlings of both species and relative light intensity on the soil surface were investigated every two weeks from May 9. to Sep. 12. At the end of the experiment, the number of germinable buried seeds were counted. The soil surface temperature was measured during 3 days before and after each cutting. The total number of seedlings during the experimental period was in the order of the bare ground plot>the cutting plot>the no cutting plot. In the bare ground plot, the largest number of seedling was observed in the middle of June for Da and from the end of May to the middle of June for EC. In the cutting plot, many seedlings were observed in both species during the first two weeks following cutting. Intensive germinations were not observed in both species in no cutting plot. The number of germinable buried seeds of both species at the end of the experiment in the no cutting plot was significantly (p<0.05) larger than that of the cutting plot and the bare ground plot where no germinable buried seeds were found. It was considered that the increase in relative light intensity and the widened diurnal range of surface soil temperature after cutting induced the germinations in both species.

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