2010 Fiscal Year Final Research Report
A study on the crop ecological and agronomical factors that cause growing yield gap between Japanese and US soybean production
| Project/Area Number |
20405021
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Crop science/Weed science
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| Research Institution | Kyoto University |
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Principal Investigator |
SHIRAIWA Tatsuhiko Kyoto University, 大学院・農学研究科, 教授 (30154363)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIHIRA Taiki 酪農学園大学, 酪農学部, 教授 (50240346)
TANAKA Tomoyuki 京都大学, 大学院・農学研究科, 准教授 (50224473)
HOMMA Koki 京都大学, 大学院・農学研究科, 助教 (60397560)
KATSURA Keisuke 京都大学, 大学院・農学研究科, 助教 (20432338)
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| Project Period (FY) |
2008 – 2010
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| Keywords | ダイズ / 収量 / 気象 / 多収性 / 栽培技術 |
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| Research Abstract |
The factors for the growing yield gap between Japanese and US soybean production were analyzed in reference to meteorological resources, genetic potential of cultivars and development of crop management technologies. Meteorologically determined yield limit in USA was higher in USA than in Japan by higher solar radiation, while the trend of yield increase in USA was attributed to technological development. US cultivars showed consistently greater yield than Japanese ones and the difference was resulted from different dry matter productivity. The US cvs. exhibited high leaf stomatal conductance to gas exchange as compared to Japanese cvs. and this seemed a reason for the greater dry matter productivity in the US cvs.. Based on the field surveys, it was considered that the contribution of genetic improvement was relatively greater in the midwest region, which the contribution of crop management was greater in the midsouth and south regions.
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