Effect of Gibberellin Seed-Spray on Seedling Emergence and Growth in Dry-Seeded Rice

벼 건답직파재배에서 Gibbrellin의 종자분무처리가 출아 및 초장신장에 미치는 영향

Seedling emergence and .stand establishment in dry-seeded rice is unstable at present due to deep seeding, low temperature at seeding time, excessive drought or raining etc. This experiment was conducted to elucidate the effect of gibberellic acid(GA$_3$) on the seedling emergence and growth in dry-seeded rice. GA$_3$, IBA and Metalaxyl were treated by seed-soaking or-spray. Hwaseongbyeo, a japonica rice, was used. The seed-soaking treatment with GA$_3$ significantly increased the seedling emergence and plant height as compared with untreated seed. However, no difference was observed in IBA and Metalaxyl treatment. The optimum concentration of GA$_3$ to promote the seedling emergence and growth in dry-seeded rice was about 100ppm for seed-soaking and about 200ppm for seed-spray treatment. The seed-spray treatment of GA$_3$ with 200ppm promoted earlier and faster seedling emergence and elongated seedling height as compared with untreated seed.

식물생장조절제가 벼 건답직파재배시 출아 및 초기생육 촉진에 미치는 효과를 구명하기 위하여, 화성벼를 공시하고 3가지 약제를 사용하여 종자침종 또는 종자분무처리하였을 때 이들의 출아 및 초장신장에 대한 효과를 조사하여 다음과 같은 결과를 얻었다. 1. Gibberellin (GA$_3$ 4% 액제)은 건답직파재배에서 벼의 출아 및 초장신장 촉진에 현저히 효과가 없었다. 2. GA$_3$ 종자침종처리의 적정 농도는 약 100ppm이었고, 종자분무처리의 적정 농도는 약 200ppm이었다. 3. GA$_3$(200ppm)의 종자분무처리는 무처리에 비하여 출아를 1～2일 단축시켰고, 출아율이 높았으며 초장신장 효과가 인정되었다. 4. GA$_3$의 종자처리는 묘의 초엽과 엽신 및 엽초의 신장을 촉진시켰다.