2020年9月8日
P-dipping of rice seedlings increases applied P use efficiency in high P-fixing soils
日本土壌肥料学会2020年度岡山大会
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- 開催年月日
- 2020年9月8日 - 2020年9月10日
- 記述言語
- 英語
- 会議種別
- 口頭発表(一般)
- 主催者
- 日本土壌肥料学会
- 開催地
- 岡山大学
- 国・地域
- 日本
Applied phosphorus (P) use efficiency is generally low due to the low mobility of P in soil and its affinity to form insoluble complexes. Localized P application nearby the root zone is a potential approach to overcome this issue in crop production. However, the interaction with soil conditions is little understood, which results in less effective application of this approach. Using root-box experiments and changing P-retention capacity of soils, we revealed that applied P use efficiency of rice can be substantially improved by dipping seedlings in P-enriched slurry at transplanting (P-dipping) even in highly P-fixing soils. Spatial analysis of soluble P in soils indicated that P-dipping creates a P hot spot as P was transferred with the slurry attached to seedling roots and eventually induced vigorous surface root development, facilitating P uptake from the spot. In contrast, the effect of conventional P incorporation depended on P-retention capacity of soils; no increases in soluble P content in soils or plant P uptakes were observed when P-retention capacity was high. Our finding of significant interaction between localized P application and a specific soil property should help improving applied P use efficiency and achieving sustainable lowland rice production against depleting P fertilizer resources.
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