温度の上昇,下降が暖地型イネ科牧草の生育に及ぼす影響

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  • The Effect of Rising or Falling Temperature on the Growth and Development of Tropical and Subtropical Grass Species
  • オンド ノ ジョウショウ カコウ ガ ダンチガタ イネカ ボクソウ ノ セイイ

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To determine the effect of temperature changes with seasonal progress on the growth and development of dallisgrass, setaria and green panic, the experiment was conducted under the rising temperature regime (moving the plants from 15 to 25℃) or the falling temperature regime (from 25 to 15℃) in the natural and artificial light (long-day) condition. The rising temperature regime: The increased stem numbers and/or the higher distribution of dry matter to root delayed the increase in total dry matter and the advance in growth stage in the initial low temperature period. At the successive high temperature period, however, such growth responses took a turn favorable to the growth and development. The falling temperature regime: Leaf production which was accelerated by the initial high temperature ceased at the following low temperaure period, but the advance in growth stage and the increase in dry matter distribution to stem continued. For dallisgrass, the greater accumulation of total nonstructural carbohydrates was found in the stem part, while dry matter distribution to it was not so much.

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