Physiological and Ecological Studies on the Regrowth of Herbage Plants : 17. Relation of the chemical composition of root and stubble, and the state of tillers to the regrowth of several herbage grasses with the development of stage

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  • 牧草の再生に関する生理・生態学的研究 : 第17報数種イネ科牧草の生育段階別再生量と株・根の化学成分および分けつとの関係
  • 数種イネ科牧草の生育段階別再生量と株・根の化学成分および分けつとの関係
  • スウシュ イネカ ボクソウ ノ セイイク ダンカイ ベツ サイセイリョウ ト カブ ネ ノ カガク セイブン オヨビ ワケツ ト ノ カンケイ

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Abstract

In order to study the mechanism of regrowth with the development of stage, the reserve carbohydrate of root and stubble, and nitrogen content of stubble at defoliation were measured. It was found that the changes in dry weight of regrowth with the development of stage was similar to those of nitrogen percentages in stubble. From the result, it was supposed that the stage which was suitable for regrowth meant the stage which contained large numbers of nitrogen rich tillers, i.e., young tillers. For this reason, the state of tiller at defoliation was investigated. Results obtained were as follows. 1) In case of oats and Italian ryegrass, stem internodes elongated simultaneously, and new tillers stopped to initiate after heading stage. So, the vegetative tillers decreased with the development of stage. As a result, the dry weight of regrowth of oats and Italian ryegrass decreased with the development of stage. 2) In case of timothy and orchardgrass, stem internodes elongated simultaneously, and new tillers stopped to initiate at heading stage, but after that, initiated again. As a result, the dry weight of regrowth of timothy and orchardgrass was least at the heading and ripening stage, and was great before and after these stages. 3) In case of perennial ryegrass and Rhodesgrass, stem internodes elongated simultaneously, but new tillers initiated constantly over all stages. As a result, the dry weight of regrowth of perennial ryegrass and Rhodesgrass was least at the heading and ripening stage, and was great before and after these stages. 4) In case of bahiagrass, stem internodes did not elongate simultaneousely, and new tiller initiated constantly over all stages. As a result, the dry weight of regrowth of bahiagrass increased with the development of stage. 5) In case of Dallisgrass, stem internodes did not elongate simultaneously, and new tiller stopped to initiate at late period of growth. As a result, the dry weight of regrowth of Dallisgrass increased at middle period of growth, and was small before and after this period.

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