2016年4月
Effects of different phosphorus-efficient legumes and soil texture on fractionated rhizosphere soil phosphorus of strongly weathered soils
BIOLOGY AND FERTILITY OF SOILS
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- 巻
- 52
- 号
- 3
- 開始ページ
- 367
- 終了ページ
- 376
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s00374-015-1082-4
- 出版者・発行元
- SPRINGER
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 on fractionated rhizosphere soil P in two contrasting textured soils of Tanzania, i.e., strongly weathered soils. We conducted a 30-day pot experiment, where white lupin (Lupinus albus L.; WL), cowpea (Vignaungui culate L.; CP), and pigeon pea (Cajanus cajan L.: PP) were grown with and without N application (0 and 50 kg N ha(-1)). Plant growth, P uptake, rhizosphere pH, and fractionated soil P were investigated. Plant P uptake decreased in the following order: WL > CP > PP in clayey soil and CP > PP > WL in sandy soil. 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 contents of less labile inorganic P fraction (NaOH-P-i) was significantly different between legumes; NaOH-P-i contents of WL was significantly lower than those of CP and PP. All legumes substantially increased the less labile organic P fraction, and its ratio was significantly higher in sandy soil. Our results suggest that WL had different P mobilization characteristics from CP and PP and that the effect of P-efficient legume cultivation on soil P availability should be more important in the inherently P poor sandy soil than in clayey soil.
- リンク情報
- ID情報
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- DOI : 10.1007/s00374-015-1082-4
- ISSN : 0178-2762
- eISSN : 1432-0789
- Web of Science ID : WOS:000373441700009