This experiment was carried out to determine effects of seed rate of native grasses, called native summer forage crops (NSFC), on their growth characteristics and yields in no-tillage paddy fields in central provinces. NSFC cultivation was performed according to the agricultural guidelines of the Rural Development Administration (RDA) during 2020 to 2022. Echinochloa crusgalli ‘Jeju native’, Setaria viridis ‘Korean native type’, Digitaria sanguinalis ‘Korean native type’) were sown by various seed rate in the experimental field (3m × 4m plot) of Department of Animal Resources Development, Seonghwan–eup, Cheonan, Korea in late-May or early-June for 3 years and harvested in middle-September. Dry matter yields (DMY) in Echinochloa crusgalli and Setaria viridis increased as increasing seed rate. DMY in 40 kg ha-1 of Echinochloa crusgalli was the highest and DMY in 60 kg ha-1 of Setaria viridis was the highest. However, All treatments of Digitaria sanguinalis showed similar DMY. Yields of NSFC were the order of Echinochloa crusgalli (9,681~11,092 kg ha-1) > Digitaria sanguinalis (8,311~9,023 kg ha-1) >etaria viridis (3,145~4,749 kg ha-1). The contents of crude protein in NSFC were the order of Digitaria sanguinalis > Echinochloa crusgalli > Setaria viridis. The contents of ADF and NDF in NSFC were the order of Echinochloa crusgalli > Digitaria sanguinalis > Setaria viridis. As shown in above results, we suggest that introduction of NSFC is one of the most important skills in order to stably increase yields of forage crops for utilization of the double cropping system in no-tillage paddy fields.

ABSTRACT
Ⅰ. 서론
Ⅱ. 재료 및 방법
    1. 하계 자생사료작물 수집 및 시험포 조성
    2. 사료가치 및 통계 분석
    3. 시험지역 토양특성 및 기후
Ⅲ. 결과 및 고찰
    1. 하계 자생사료작물 의 파종량에 따른 생육특성
    2. 하계 자생사료작물 의 파종량에 따른 건물수량
    3. 하계 자생사료작물 의 파종량에 따른 사료가치
Ⅳ. 요 약
Ⅴ. 사사
Ⅵ. REFERENCES

• 정종성(국립축산과학원) | Jeong Sung Jung (Grassland and Forages Division, National Institute of Animal Science, Rural Development Administration)
• 최보람(국립축산과학원) | Bo Ram Choi (Grassland and Forages Division, National Institute of Animal Science, Rural Development Administration)
• 이세영(국립축산과학원) | Se Young Lee (Grassland and Forages Division, National Institute of Animal Science, Rural Development Administration)
• 오미래(국립축산과학원) | Mirae Oh (Grassland and Forages Division, National Institute of Animal Science, Rural Development Administration)
• 박형수(국립축산과학원) | Hyung Soo Park (Grassland and Forages Division, National Institute of Animal Science, Rural Development Administration)
• 최기춘(국립축산과학원) | Ki Choon Choi (Grassland and Forages Division, National Institute of Animal Science, Rural Development Administration) Corresponding Author