Relationship Between the Development of the Root System and Initial Growth of Sugarcane

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  • サトウキビ初期生育における根の種類・量と生育量に関する研究
  • 形態 サトウキビ初期生育における根の種類・量と生育量に関する研究
  • ケイタイ サトウキビ ショキ セイイク ニ オケル ネ ノ シュルイ リョウ ト セイイクリョウ ニ カンスル ケンキュウ

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Abstract

Sugarcane (Saccharum spp.) is often damaged by a meteorological disaster in the initial growth stage; consequently its yield is decreased. To solve this problem, we performed studies to develop a deeper root system as rapidly as possible. In the present study, 6 varieties of sugarcane were grown in a 1m-deep pots for 40 days to examine the relationship between the development of root system and initial growth rate. The primary root number, and root weight density, and root depth index (RDI) were measured, and growth analysis was conducted. In 0-30cm soil depth, shoot root number was significantly correlated with root weight density, but not in a deeper layer of the soil. The ratio of shoot root number to total root number did not significantly correlate with RDI, but with the relative growth rate (RGR). The results show that the development of shoot roots increases the root-weight density, and the ratio of shoot root number to total root number, resulting in the increase in RGR in the initial growth stage.

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