Effect of Cutting Height and Growth Season on the Regrowth of Orchardgrass, Dactylis glomerata L

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  • オーチャードグラスの再生長に及ぼす刈取り高さと生育季節の影響
  • オーチャードグラス ノ サイセイチョウ ニ オヨボス カ トリダカ サ ト セイイク キセツ ノ エイキョウ

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A study was conducted in three different harvest-year swards to clarify the effect of cutting height and growth season on the regrowth of orchardgrass. The defoliation levels were 3, 6 and 12cm, and the process of regrowth was investigated weekly or fortnightly except winter-time. The seasonal changes of the vertical distribution of leaf, stem and total available carbohydrate were also investigated. With the higher level of defoliation, plant height, leaf area index, light interception and dry matter yield increased promptly, and the curve of yield marked the peak at an earlier stage, thereafter declining rapidly. Whereas, with the lower defoliation level, the regrowth was retarded and the curve of yield ascended gradually to the ceiling point, declining slowly thereafter. The difference of regrowth between the higher and the lower cutting heights was remarkable in summer. Dry weight and TAC concentration of stubbles reduced rapidly and their recoveries were retarded as the defoliation was severe. It was observed that dry weight and TAC content of leaf and stem at the base of the stubbles were especially scant in summer. The results suggest that the higher cutting height of orchardgrass must be associated with frequent defoliation and might be suitable especially when carbohydrate reserves are deficient.

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