講演・口頭発表等

国際共著
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
  • Aung Zaw Oo
  • ,
  • Yasuhiro Tsujimoto
  • ,
  • Njato Mickaël Rakotoarisoa
  • ,
  • Kensuke Kawamura
  • ,
  • Tomohiro Nishigaki

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.

リンク情報
URL
https://www.jssspn.org/2020/