This study aimed to investigate the impacts of extreme weather on the dry matter yield (DMY) of silage maize in South Korea. The maize data (n=3,041) were collected from various reports of the new variety of adaptability experiments by the Rural Development Administration (1978-2017). Eight weather variables were collected: mean temperature, low temperature, high temperature, maximum precipitation, accumulated precipitation, maximum wind speed, mean wind speed, and sunshine duration. These variables were calculated based on ten days within seeding to harvesting period. The box plot detected an outlier to distinguish extreme weather from normal weather. The difference in DMY between extreme and normal weather was determined using a t-test with a 5% significance level. As a result, outliers of high-extreme precipitation were observed in July and August. Low-extreme mean temperature was remarkable in middle May, middle June, and late July. Moreover, the difference in DMY between extreme and normal weather was greatest (5,597.76 kg/ha) during the maximum precipitation in early July. This indicates that the impact of heavy rainfall during the Korean monsoon season was fatal to the DMY of silage maize. However, in this study, the frequency of extreme weather was too low and should not be generalize. Thus, in the future, we plan to compare DMY with statistical simulations based on extreme distributions.

ABSTRACT
Ⅰ. 서론
Ⅱ. 재료 및 방법
    1. 자료 수집 및 변수생성
    2. 통계적 분석방법
Ⅲ. 결과 및 고찰
    1. 사료용 옥수수의 생장 기간을 고려한 연도별 기상변수
    2. 사료용 옥수수의 건물 수량에 미치는 극단기상의 효과
Ⅳ. 결론
Ⅴ. 요약
사사
Ⅵ. 참고문헌

• 김문주(강원대학교 동물생명과학연구소 연구원) | Moonju Kim (Researcher, Institute of Animal Life Science, Kangwon National University, Chuncheon 24341, Korea)
• 최재성(강원대학교 동물생명과학대학 대학원생) | Jae-Sung Choi (Graduate student, Department of Animal Life Science, Kangwon National University, Chuncheon 24341, Korea)
• 성경일(강원대학교 동물생명과학대학 교수) | Kyungil Sung (Professor, Department of Animal Life Science, Kangwon National University, Chuncheon 24341, Korea) Corresponding author