Root Research
Online ISSN : 1880-7186
Print ISSN : 0919-2182
ISSN-L : 0919-2182
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Volume 23, Issue 4
Displaying 1-2 of 2 articles from this issue
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Original Paper
  • Underlying causes of the low winter wheat yields inferred based on root system distribution and soil nitrogen dynamics in Konan, Kiyosato-cho
    Hirotake Itoh, Chiyo Yoshioka, Toshimitu Shibata, Fumihiro Satoh, Hozu ...
    2014 Volume 23 Issue 4 Pages 91-98
    Published: 2014
    Released on J-STAGE: December 20, 2015
    DOIhttps://doi.org/10.3117/rootres.23.91
    JOURNAL FREE ACCESS
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    Yields of winter wheat in Konan, Kiyosato-cho, were approximately 80-90% of the mean yield of the town, partly because of early die-off. This study assessed the factors affecting the low yields by examining the soil profile and root system in each field of that district. The results showed that pyroclastic flow deposits (Km-5a horizon) restricted root growth in the fields of the Konan area, and that shallow root systems have attracted a low yield in wheat yields. In Konan, significant correlations were observed between the grain yield and the root depth index. A survey of soil nitrate nitrogen also revealed that the soils of Konan fields tended to become severely nitrogen (NO3-N) -deficient. From these results, we suggest that shallow-rooted wheat and low nitrogen soil attracted a low yield.
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Opinion
  • Grasping root system architecture
    Shigenori Morita, Jun Abe
    2014 Volume 23 Issue 4 Pages 99-106
    Published: 2014
    Released on J-STAGE: December 20, 2015
    DOIhttps://doi.org/10.3117/rootres.23.99
    JOURNAL FREE ACCESS
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    We previously recommended the improved soil profile method to grasp root system morphology of field-grown crops. Root system morphology of rice plants can be characterized by total root length and its distribution in soil both of which are determined by the combinations of number, length and direction of roots, respectively. It is already known that direction and length of roots could be influenced with root diameter. These important traits, number, length and diameter of roots, might be determined by number and size of phytomers composing shoot. These results suggest the possible interrelationship between plant and root types. A root system model which has uniformly elongating roots was proposed as the standard to compare with. The model had been evolved into a more sophisticated root system model based on simple and reasonable conditions to analyze root system morphology in detail.
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