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Studies on Premature Heading and Its Prevent Methods for Early Season Culture and Planting of Extremely Early Rice Cultivars in Warm South-west Japan

Research Project

Project/Area Number 14560012
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 作物学
Research InstitutionKochi University

Principal Investigator

YAMAMOTO Yoshinori  Kochi University, Faculty of Agriculture, Professor, 農学部, 教授 (00093956)

Co-Investigator(Kenkyū-buntansha) YOSHIDA Tetsushi  Kochi University, Faculty of Agriculture, Professor, 農学部, 教授 (10145112)
MIYAZAKI Akira  Kochi University, Faculty of Agriculture, Associate Professor, 農学部, 助教授 (00304668)
SAKATA Mototaka  Kochi Agricultural Experiment Station, Department of Agriculture and Horticulture, Senior Scientist, 作物園芸部, 主任研究員
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2002: ¥1,900,000 (Direct Cost: ¥1,900,000)
KeywordsPremature heading / Extremely early rice cultivar / Effective cumulative temperature / Thermo-sensitivity / Photo-sensitivity / Basic vegetative growth / Nursery condition / Brown rice yield and quality / 玄米品質 / 収量 / 剪葉処理 / 苗の種類 / 有効精算温度 / 幼穂分化 / 移植時期 / 施肥量 / 苗の葉齢 / 日長 / 播種量 / 積算温度 / 育苗温度 / 窒素追肥 / 移植後の温度 / 土壌還元
Research Abstract

The premature heading of ‘Tosapika', an extremely early rice cultivar bred in Kochi Prefecture occurred in many farmer's fields in the first year of planting (1988). This study was conducted to clarify the factors related to premature heading of the cultivar ‘Tosapika', and to establish a method of cultivation that would prevent premature heading.
1.The effective cumulative temperature (base temp. 10℃) after sowing to flag leaf expansion was lower in ‘Tosapika' due to the fewer number of final leaves on the main culm in comparison with the cultivars bred in Hokkaido. The panicle differentiation and development was scarcely influenced by daylength in the seedling of ‘Tosapika' and the panicle formation stage was observed at 301-348℃ days from sowing. These results were suggested that the thermo- and photo-sensitivities and basic vegetative growth of ‘Tosapika' were comparatively small.
2.Yield in the premature-heading group (PMHG) was 9-15% lower than that in the control group (CG). In the PMHG the number of spikelets per unit area was lower than in the CG, due to the markedly lower number of spikelets per panicle. The decrease in the number of spikelets, together with the lower percentage of filled grains on the tillers, was considered to be the reason for the lower yield in the PMHG. The apparent quality of the brown rice was low in the PMHG because of the presence of a lot of green rice kernels.
3.As the methods of cultivation that would retard premature heading of ‘Tosapika', it was suggested that nursery management such as not topdressing nitrogen after 200℃days from sowing (after 3.5 leaf age) and higher sowing rates for the lowering dry weight/plant height ratio were necessary to retard young panicle differentiation in ‘Tosapika' seedlings as well as an increased basal nitrogen application for the nursery box and leaf cutting treatment during nursery period.

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (14 results)

All 2004 2003 2002 Other

All Journal Article (11 results) Publications (3 results)

  • [Journal Article] 西南暖地における早期栽培用・極早生水稲品種とさぴかの出穂特性-日長,温度と幼穂分化,発育-2004

    • Author(s)
      坂田雅正
    • Journal Title

      日本作物学会記事 73・2

      Pages: 189-196

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 極早生水稲品種とさぴかの異常(不時)出穂の発生とその後の生育,収量および玄米品質2004

    • Author(s)
      坂田雅正
    • Journal Title

      日本作物学会記事 73・4

      Pages: 443-449

    • NAID

      110001725930

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Heading characteristics of the extremely early rice Cultivar ‘Tosapika' in warm south-west district in Japan-Effects of daylength and temperature on the differentiation and development of the young panicle.2004

    • Author(s)
      Mototaka Sakata
    • Journal Title

      Japanese Journal of Crop Science 73・2

      Pages: 189-196

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effects of premature heading on growth, yield and brown rice quality in extremely early rice cultivar ‘Tosapika'.2004

    • Author(s)
      Mototaka Sakata
    • Journal Title

      Japanese Journal of Crop Science 73・4

      Pages: 443-449

    • NAID

      110001725930

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 西南暖地における早期栽培用・極早生水稲品種「とさぴか」の出穂特性-日長,温度と幼穂の分化,発育-2004

    • Author(s)
      坂田雅正
    • Journal Title

      日本作物学会紀事 73・2

      Pages: 189-196

    • NAID

      110001726123

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 極早生水稲品種「とさぴか」の異常(不時)出穂の発生とその後の生育,収量および玄米品質2004

    • Author(s)
      坂田雅正
    • Journal Title

      日本作物学会紀事 73・4

      Pages: 443-449

    • NAID

      110001725930

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 育苗時の温度,箱当たり播種量,基肥窒素施用量が極早生水稲品種とさぴかの幼穂分化,発育程度に及ぼす影響2004

    • Author(s)
      坂田雅正
    • Journal Title

      日本作物学会紀事 73・別2

      Pages: 76-77

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 西南暖地における早期栽培用・極早生水稲品種とさぴかの出穂特性-温度に対する出穂反応-2003

    • Author(s)
      坂田雅正
    • Journal Title

      日本作物学会記事 72・2

      Pages: 163-170

    • NAID

      110001742615

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Heading characteristics of the extremely early rice cultivar ‘Tosapika' in warm south-western district in Japan-Effects of temperature on the heading2003

    • Author(s)
      Mototaka Sakata
    • Journal Title

      Japanese Journal of Crop Science 72・2

      Pages: 163-170

    • NAID

      110001742615

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 早期栽培用・極早生水稲品種とさぴかに発生した異常(不時)出穂-発生状況とその形態および要因2002

    • Author(s)
      坂田雅正
    • Journal Title

      日本作物学会記事 71・4

      Pages: 446-454

    • NAID

      110001725516

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Premature heading of extremely early rice cultivar ‘Tosapika'-Condition of occurance and related factors2002

    • Author(s)
      Mototaka Sakata
    • Journal Title

      Japanese Journal of Crop Science 71・4

      Pages: 446-454

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] 和田貴士: "育苗時の箱当たり播種量,基肥窒素施用量が極早生水稲品種とさぴかの幼穂分化,発育程度に及ぼす影響"日本作物学会四国支部会報. 40号. 20-21 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 坂田雅正: "極早生水稲品種とさぴかの出穂変動に関する研究-主稈出穂日の変動とそれにともなう形態変化-"日本作物学会記事. 71・別1. 10-11 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 坂田雅正: "西南暖地における早期栽培用・極早生品種とさぴかの出穂特性-温度に対する出穂反応-"日本作物学会記事. (印刷中). (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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