| Project/Area Number |
25850040
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Plant nutrition/Soil science
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| Research Institution | Tokyo University of Agriculture and Technology (2015)
Kyushu University (2013-2014) |
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Principal Investigator |
Sugihara Soh 東京農工大学, (連合)農学研究科(研究院), 准教授 (30594238)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | リン / 難溶性リン / シロバナルーピン / 半乾燥熱帯アフリカ / 土壌肥沃度 |
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| Outline of Final Research Achievements |
Phosphorus (P) deficiency is one of the largest constraints to crop production in tropical Africa, so, it is necessary to better exploit soil P resources through increasing labile soil P using P-efficient plants. The aim of this study was to evaluate the effect of various P-efficient legumes (especially for white Lupin; Lupinus albus L.) on fractionated rhizosphere soil P in two contrasting textured soils of Tanzania. We conducted a 30-day pot experiment, where white lupin (WL), cowpea (Vignaungui culate L.; CP) and pigeon pea (Cajanus cajan L.: PP) were grown. We observed clear effects of all legumes on the rhizosphere soil P dynamics of all fractions in both soils, except for the labile P fraction in clayey soil. The effect of legume growth on the less labile inorganic P fraction (NaOH-Pi) was different between legumes; WL decreased the NaOH-Pi, while CP and PP increased it. Our results suggest that WL had different P mobilization characteristics from CP and PP.
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