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Development of field methods for evaluating acquisition of potassium by rice plants

Research Project

Project/Area Number 25870340
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Plant nutrition/Soil science
Environmental agriculture(including landscape science)
Research InstitutionKyoto University

Principal Investigator

MORITSUKA Naoki  京都大学, (連合)農学研究科(研究院), 助教 (10554975)

Project Period (FY) 2013-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywords水田土壌 / カリウム / 根域 / 空間変動 / 固定容量 / 空間変動解析 / 根域土壌 / 局所施肥 / 水田 / 非交換態 / 局所施用
Outline of Final Research Achievements

Experiments were attempted to find how rice plants acquire potassium (K) in a paddy field. I obtained the following results.
1) In a field experiment where planted and unplanted plots were equipped, it was found that exchangeable K in soil decreased from planting to full heading stages and increased thereafter. 2) At a greater scale covering five paddy fields, only a weak relationship was found between exchangeable K and boiling HNO3-extractable nonexchangeable K. The former and the latter fractions were regulated by organic matter and clay contents, respectively. 3) The K-fixation capacity was quantified by saturating a soil sample with KCl, which was followed by repeated extraction of fixed K with NH4OAc and HCl. The K-fixing capacity thus evaluated was found to increase, when the soil was located around plant roots or it was subjected to flooding.

Report

(3 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • Research Products

    (2 results)

All Other

All Remarks (2 results)

  • [Remarks] 京都大学教育研究活動データベース

    • URL

      https://kyouindb.iimc.kyoto-u.ac.jp/view/

    • Related Report
      2014 Annual Research Report
  • [Remarks] 京都大学教育研究活動データベース

    • URL

      http://kyouindb.iimc.kyoto-u.ac.jp/view/

    • Related Report
      2013 Research-status Report

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Published: 2014-07-25   Modified: 2019-07-29  

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