Effect of Transplanted - Seedling Age on the Herbicidal Phytotoxicity and Yield in Machine-Transplanted Rice

기계이앙재배(機械移秩栽培)에서 묘령(苗令)의 차이(差異)가 제초제(除草劑)의 약해(藥害), 생육(生育) 및 수량(收量)에 미치는 영향(影響)

Initial crop injury, plant growth and yield of machine-transplanted rice of seedlings different in plant age (8-, 20-, and 35-day-old seedlings) after application of herbicides were investigated in field. The herbicides employed were butachlor, dithiopyr, pyrazolate(applied only for 8-day-old seedling), dithiopyr+pyrazolate, dithiopyr+ bensulfuron methyl), and butachlor+bensulfuron methyl(applied only for 20-and 35-day-old seedlings). There was no significant difference in plant growth, yield components and yield between the different-aged seedlings of the untreated check, except for the heading date, The heading date of 8-day-old seedling was delayed for 2 and 6 days as compared with those of 20-and 35-day-old seedlings, respectively. A very slight initial crop injury was found with the tested herbicides for all the different-aged seedlings. No significant differences in plant height and tiller number occurred between different-aged seedlings and the respective untreated check. All the herbicides used gave a good weeding effect. Yield components and yields were not affected by different-aged seedlings after application of the herbicides.

동일(同一) 포장(圃場)에 벼를 묘령별(苗令別)(8일묘(日苗), 20일묘(日苗), 35일묘(日苗))로 재식(栽植)한 후(後) butachlor, dithiopyr, pyrazolate 등의 각단제(各單劑) (pyrazolate는 8일묘(日苗)에만 사용(使用)) 및 dithiopyr+pyrazolate, dithiopyr+benzulfuron - methyl, butachlor+beansulfuron methyl(20일묘(日苗) 및 35일묘(日苗))에만 사용(使用)등의 제초제(除草劑)를 처리(處理)하여 초기약해(初期藥害) 및 생육(生育), 수량(收量)등을 조사(調査)한 결과(結果)는 다음과 같다. 1. 묘령별(苗令別)로 각(各) 실행구(實行區)의 생육(生育), 수량구성요소수량(收量構成要素收量), 비교조사(比較調査)한 바 유의차(有意差)가 없었다. 단(但) 출수일자(出穗日字)는 8일묘(日苗)가 20일묘(日苗) 보다 2일(日) 늦고 35일묘(日苗) 보다는 6일(日) 늦었다. 2. 각(各) 묘령구(苗令區) 모두 공시제초제(供試除草劑)에 대하여 약해(藥害)는 동일(同一)하게 경미(輕微)하였고, 그후의 초장(草長), 분얼수(分蘖數) 모두 실행구(實行區) 대비(對比)(56 DAT시(時)) 유의차(有意差)가 없었다. 3. 제초효과(除草效果)는 공시제초제(供試除草劑) 모두 우수 하였다. 4. 각(各) 수량구성요소(收量構成要素), 수량(收量) 모두 각(各) 묘령별(苗齡別)의 실행구(實行區)에 비(比)하여 유의차(有意差)가 없었다.