Continuous Forage Production by Means of Rotating Cool- and Warm-Season Grasses : III. Performance of Italian ryegrass undersown among setaria stands in relation to the environmental condition

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  • 冬作牧草類と暖地型牧草との連続栽培に関する研究 : III.夏作セタリア立毛中に中播きしたイタリアンライグラスの発芽・生育環境について
  • 冬作牧草類と暖地型牧草との連続栽培に関する研究-3-夏作セタリア立毛中に中播きしたイタリアンライグラスの発芽・生育環境について
  • フユサク ボクソウルイ ト ダンチガタ ボクソウ ト ノ レンゾク サイバイ

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This experiment was conducted to find out suitable method of undersowing Italian ryegrass into Kazungula setaria (Setaria anceps cv. Kazungula) sward as an aftercrop of this annual warm-season grasses. Two early cultivars of Italian ryegrass (Lolium muttiflorum) i.e. Waseyutaka and Yamakei No.13 (abbreviated -1 and -13 respectively in Tables and Figures) were combined with 3 heights i.e. 0, 5 and 15cm above ground level (abb. 0-, 5- and 15- respectively) of final cutting of preceding setaria crop, which was practised immediately before the undersowing. Results are summarized as follows, 1) The height of ryegrass seedling surpassed that of setaria within one month after sowing in spite of reduced 50% light condition caused by the aftermath of the 15cm cut stubble of setaria comparing with 0cm cut plot, which was regarded as the control because no regrowth was resulted (Fig.1). 2) Undersowing environment was observed as compared with the control plot (0-1) as shown in Fig.2. Undersowing seemed to be favorable for germination process because of higher temperature and soil moisture caused by the aftermath, but no significant difference in the process was found between these plots (Table 1). 3) Extended plant height and checked development of root characterized the early growth of undersown ryegrass, but aboveground part was not significantly retarded in dry matter weight comparing with the control (Table 2). 4) Ryegrass cv. -1 was superior to cv. -13 in terms of the total yeild, though which was not significantly affected by the cutting height of preceding setaria (Fig.3). 5) Consequently, these cultivars of ryegrass are recognized to be capable of under-sowing condition of 50% reduced light for one month of duration.

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