This study was conducted to find out the effects of seed mixture using new domestic grass varieties orchardgrass ‘Onnuri’ and tall fescue ‘Greenmaster’ on botanical composition and dry matter productivity from 2015 to 2018 in oversown hilly pasture, the central northern area of Korea. This experiment was consisted of 4 mixed grasses (Treatment 1 : tall fescue oriented mixture with imported varieties; Treatment 2 : orchardgrass oriented mixture with imported varieties; Treatment 3 : orchardgrass oriented mixture with domestic varieties, Treatment 4 : tall fescue oriented mixture with domestic varieties). Evaluation of seasonal changes in botanical composition of pasture showed that orchardgrass was the highest in all treatments, ranging from 46 to 89% and Kentucky bluegrass was the second highest in all treatments. Treatment 3 (7,633 kg ha-1) and Treatment 4 (7,570 kg ha-1), mixed grasses using domestic varieties, were showed the highest dry matter yield than Treatment 1(6,950 kg ha-1) and Treatment 2 (6,934 kg ha-1), which were mixed grasses using introduced varieties. Therefore, these results showed that the orchard grass oriented grasses mixture with domestic varieties was good for grassland vegetation and productivity in oversown hilly pasture, the central northern area of Korea.

ABSTRACT
Ⅰ. 서 론
Ⅱ. 재료 및 방법
    1. 시험지
    2. 시험 설계 및 수행
    3. 조사항목
    4. 통계분석
Ⅲ. 결과 및 고찰
    1. 시험대상지 평균기온 및 강수량
    2. 초기 생육특성 및 월동성 평가
    3. 초지 식생변화 및 생육특성 평가
    4. 목초의 건물생산성 변화
Ⅳ. 요 약
Ⅴ. 사 사
Ⅵ. REFERENCES

• 정종성(농촌진흥청 국립축산과학원) | Jeong Sung Jung (National Institute of Animal Science, Rural Development Administration) Corresponding author
• 최기춘(농촌진흥청 국립축산과학원) | Ki Choon Choi (National Institute of Animal Science, Rural Development Administration)
• 김원호(농촌진흥청 국립축산과학원) | Won Ho Kim (National Institute of Animal Science, Rural Development Administration)
• 최기준(농촌진흥청 국립축산과학원) | Gi Jun Choi (National Institute of Animal Science, Rural Development Administration)