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DIVISION S-1—SOIL PHYSICS

Root-System Development and Water-Extraction Model Considering Hydrotropism

Division of Forest Science, Graduate School of Agriculture, Kyoto University, Oiwakecyo Kitashirakawa Sakyo-ku Kyoto-city Kyoto 6068502, Japan

^* Corresponding author (td3{at}kais.kyoto-u.ac.jp)

A two-dimensional model that combines root-system development and water extraction by roots is proposed to simulate the dynamic interaction between root growth and soil-water flow. Both of hydrotropism and gravitropism were considered as the controlling factors of root growth in the proposed root-system development model. The finite-element method was employed to compute the soil-water flow caused by water extraction, evaporation, and irrigation. We succeeded in simulating the plagiogravitropic elongations of lateral roots under a plane condition, and the asymmetric architecture of root system under a slope condition by the proposed model in which the root hydrotropism is considered. On the other hand, we cannot simulate such morphological characteristics of a root system by the use of the conventional model in which a random elongation factor is employed, and root hydrotropism is not considered. The results support the importance of hydrotropism in root-system development and the availability of the proposed model in which the hydrotropism is considered.

Abbreviations: ER, elongation rate

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