湛水直播水稲の出芽・苗立ち向上に向けて  [in Japanese] Improvement of Seedling Emergence and Establishment of Rice Direct Seeded in Flooded Paddy Fields  [in Japanese]

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Abstract

現在,我が国の水稲移植栽培では,育苗および田植え作業が労働時間の1/4を占めているため,直播栽培の導入によって稲作の省力・低コスト化が進むことを期待されている.しかしながら,現在,直播栽培の普及面積は水稲栽培全体の約1%であり,一般的な技術として普及していない.この原因として,水田に直接播種することによって出芽・苗立ちが不安定になりやすいことが大きな要因になっていると考えられる.本稿では,播種後落水の効果,播種後落水を効率よく行うための圃場条件,過酸化カルシウム剤・鉄コーティングおよび種子予措の効果,播種後の気象条件,良出芽となる品種が持つべき特性および育種への利用,出芽・苗立ちに関与する種子の糖代謝についての知見を整理して,今後の研究方向を論じる.

In our country, the work of raising seedlings and transplantation occupies one-quarter of the working hours for growing rice. Introduction of direct seeding culture is expected to reduce the cost and labor for rice farming. However, direct seeding culture is not widespread and is used for only about 1% of the land for rice cultivation. The main reason is thought to be the unstable seedling emergence after direct seeding. In this paper, studies on the factors related to seedling emergence and establishment including the effect of drainage after seeding, the field conditions required for efficient drainage after seeding, the effects of calcium-peroxide and iron-coating of seeds and seed pretreatment, the meteorological conditions after seeding, the characteristics necessary for excellent seedling emergence and its use for breeding, and the sugar metabolism in the seed related to seedling emergence are reviewed. The direction of future research is also discussed.

Journal

  • Japanese Journal of Crop Science

    Japanese Journal of Crop Science 78(2), 153-162, 2009

    CROP SCIENCE SOCIETY OF JAPAN

Codes

  • NII Article ID (NAID)
    130004461788
  • Text Lang
    JPN
  • ISSN
    0011-1848
  • Data Source
    J-STAGE 
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