Prediction of Seedling Emergence and Early Growth of Eleocharis kuroguwai Ohwi under Evaluated Temperature = 상승된 온도 조건에서 올방개(Eleocharis kuroguwai)의 출아 및 초기생장 예측

국문 초록 (Abstract)

기온상승 조건을 부여하기 위해 재식시기를 달리하여 재식 한 올방개의 출아와 초기생장을 평가하고 이들과 유효적산온도간의 관계를 수학적 모델로 해석하기 위한 포트 및 포장평가를 수행하였다. Gompertz 모델을 이용하여 이들의 관계를 비선형회귀로 분석한 결과, 파종일자 및 재식 토양심도에 상관없이 유효적산 온도로 누적출아율 및 초기생장을 양호하게 설명하였다. 올방개의 최대 출아율의 50% 도달에 필요한 유효적산온도는 올방개 괴경 재식심도 1, 3 및 5 cm에서 54.5, 84.0 및 118.0℃이었으며 5엽기에 이르는데 필요한 유효적산온도는 각각 155.3, 188.5 및 215.5℃이었다. 본 연구에서 개발된 모델식을 이용하여 계산한 결과 평균기온이 2℃ 상승한 조건에서 올방개의 50 % 출아는 심도에 따라 약 1 - 2일 빨라지고, 5엽기에 도달하는 날짜도 약 2 - 3일 빨라질 것으로 예측되었다. 따라서 2℃ 기온상승 조건에서 올방개를 효과적으로 방제하기 위해서는 현재의 제초제 처리시기보다 약 2 - 3일 빨라져야 할 것으로 판단된다.

다국어 초록 (Multilingual Abstract)

Field and pot experiments were conducted to investigate seedling emergence and early growth of Eleocharis kuroguwai panted on different dates. Non-linear regression analyses of observed data against effective accumulated temperature (EAT) with the Gompertz model showed that the Gompertz model works well in describing seedling emergence and early growth of E. kuroguwai regardless of planting date and soil burial depth. EATs required for 50% of the maximum seedling emergence of E. kuroguwai planted at 1, 3 and 5 cm soil burial depth in the pot experiment were estimated to be 54.5, 84.0 and 118.0℃, respectively, and 56.7℃ when planted at 1 cm in the field experiment. EATs required for 50% of the maximum leaf number of E. kuroguwai planted at 1, 3 and 5 cm soil burial depth in the pot experiment were estimated to be 213.3, 249.0 and 291.6℃, respectively, and 239.5℃ when planted at 1 cm in the field experiment. Therefore, models developed in this study thus predicted that if rotary tillage with water is made on 27 May under +2℃ elevated temperature condition, dates for 50% of the maximum seedling emergence, 5 leaf stage and 5 cm plant height of E. kuroguwai buried at 3 cm soil depth were predicted to be 2 June, 10 June and 12 June. These dates are 1 day earlier for the seedling emergence and 3 days earlier for the early growth as compared with current temperature condition, suggesting that earlier application of herbicides is required for effective control of E. kuroguwai.

목차 (Table of Contents)

• ABSTRACT INTRODUCTION MATERIALS AND METHODS RESULTS AND DISCUSSION 요약 REFERENCES

참고문헌 (Reference)

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