T‐R ratio - T‐R ratio (English spelling)

Japanese: T‐R率 - ティーアールりつ(英語表記)T‐R ratio
T‐R ratio - T‐R ratio (English spelling)
Abbreviation for top/root ratio, it is the ratio of the weight of the above-ground part of a crop to the weight of the underground part. There are various types of crops, some of which use the above-ground parts and some of which use the underground parts, and in order to achieve good production, it is directly necessary to increase the ratio of these parts that are used, but at the same time, it is important to properly balance the growth of both. The T-R ratio is considered to be an effective indicator of the relationship between these two. The T-R ratio is affected by the environment. If there is less sunlight, the production of carbohydrates decreases and the growth of the underground parts is more restricted, and if the supply of soil moisture and nitrogen increases, the growth of the above-ground parts will be greater, so the T-R ratio will increase.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
top/root ratioの略で,作物の地上部重量と地下部重量との比率。作物には地上部を利用するものや地下部を利用するものなどさまざまなものがあり,優れた生産をあげるためには,直接的にはこれらの利用部位の比率を高めることが必要であるが,同時に両者の生長のバランスを適正に保つことが重要である。T‐R率はこれら両者の関係を知るための有効な指標とされている。T‐R率は環境によって影響を受ける。日照が減れば炭水化物の生成は減り地下部の生育のほうがより制約されるため,また,土壌水分や窒素の供給が増加すれば地上部の生育がより大きくなるため,T‐R率は大きくなる。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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