Influence of Daily Temperature Range on Seedling Emergence and Establishment of Direct-Seeded Rice under Submerged Conditions in Cold-Climate Areas

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  • 寒冷地における気温日較差が湛水直播水稲の出芽・苗立ちに及ぼす影響
  • 寒冷地における気温日較差が湛水直播水稲の出芽・苗立ちに及ぼす影響 : 低温条件下で異なるコーティング種子を用いた解析
  • カンレイチ ニ オケル キオンビ カクサ ガ タンスイ ジカマキ スイトウ ノ シュツガ ・ ナエ タチ ニ オヨボス エイキョウ : テイオン ジョウケン カ デ コトナル コーティング シュシ オ モチイタ カイセキ
  • –Analysis using Different Coated Seeds under Low Temperature Conditions–
  • －低温条件下で異なるコーティング種子を用いた解析－

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Abstract

Previously, we investigated seedling emergence and establishment of direct-seeded rice under different air temperature and daily temperature range conditions using pregerminated seeds. Our results showed that the influence of daily temperature range after seeding was greater under low than under high temperature conditions. Furthermore, the growth under low temperature conditions after seeding was promoted when the daily temperature range was wider. In the present study, we investigated seedling emergence and establishment of direct-seeded rice grown under different daily temperature ranges in low temperature conditions using calcium peroxide-coated, iron-coated, and non-coated seeds in an incubator. Calcium peroxide-coated seeds had the highest seedling emergence and establishment rates that were least influenced by the daily temperature range. In all types of seeds, the growth under low temperature conditions after seeding was better under a wider daily temperature range condition. Furthermore, seedling emergence rate estimated by the Arrhenius equation well simulated the measured value.

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