벼 철분코팅종자의 발아 특성 및 담수깊이에 따른 초기입모 영향 = Seed Germination and Effect of Water Depths on Seedling Establishment of Iron-coated Rice Seeds

다국어 초록 (Multilingual Abstract)

Germination characteristics, seedling emergence, and early seedling growth of iron-coated rice seeds, cultivars Daebo and Samdeokbyeo, under different water depths were compared with those of non-coated seeds (control) and the results evaluated to obtain basic information for establishing stable seedlings in direct water seeding. The total germination percentage of the two seed treatments was similar, but iron-coated seeds had slightly faster germination and shorter mean germination time than non-coated seeds. Water absorption rates of iron-coated seeds were lower than that of non-coated seeds during seed germination.
The germination percentage of the two iron-coated rice seed cultivars showed a significant decline of 15-22% after one year of storage under natural conditions. The seedling emergence percentage and uniformity of the two rice cultivars were significantly higher in the iron-coated seeds at 1-13 cm water depths but the percentage of floating seedlings was lower in iron-coated seeds than in non-coated seeds. The iron-coated seeds had a high seedling emergence percentage of 91.3-93.3% at all flooding depths whereas the non-coated seeds had a significantly low seedling emergence percentage of 57.7-71.7% at a water depth of 13 cm.
Moreover, the shoot dry weight and seedling health score of iron-coated seeds were significantly higher than those of non-coated seeds, while root dry weights were similar in iron-coated and non-coated seeds, regardless of water depth. These results suggest that iron-coated seeds are more appropriate for stable seedling establishment in direct water seeding than are non-coated seeds.
Keywords : direct water seeding, dry matter, iron-coated seed, seed germination, seedling emergence

국문 초록 (Abstract)

본 연구는 벼 무논 및 담수직파 시 입모향상을 위해 철분코팅종자와 일반종자에 대한 발아특성 및 담수깊이에 따른 초기 입모영향을 구명한 결과를 요약하면 다음과 같다. 철분코팅종자는 일반종자보다 발아초기에는 발아율이 높았으나 후기에는 일반종자의 발아율과 비슷하였다. 그 결과철분코팅종자가 일반종자에 비해 발아속도가 빠르고 평균발아일수가 짧았다. 철분코팅종자를 상온종자창고에 보관시 1년이 지난 후 발아율은 보관당시보다 15.3∼21.6% 감소되어 가능한 철분코팅 종자는 1년 이내에 사용하는 것이바람직하였다. 또한 담수직파조건에서 철분코팅 종자는 일반종자에 비해 깊은 수심에도 출아율이 높고, 뜬묘비율도낮을 뿐만 아니라 모 충실도가 높아 담수직파 시 철분코팅종자를 사용하는 것이 초기입모를 향상시킬 수 있는 방법이 될 수 있다.

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