This study was conducted to investigate the effect of seeding dates on grassland productivity and botanical composition in oversown pasture located in Cheonan of South Korea. Four treatment groups were established based on the seeding dates: 18th August, 1st September, 15th September and 29th September. Evaluation of seasonal changes in botanical composition of pasture showed that the highest ratios of grass in 18th August and 1st September (pasture species 93% and weeds 7%) and the lowest in 15th September (pasture species 75% and weeds 25%). In the plant length, there is no significantly different in 5% probability level. In the total dry matter yield of grass, 18th August (13,362 kg ha–1) and 1st September (13,988 kg ha–1) were higher than 15th September (11,883 kg ha-1) and 29th September (11,459 kg ha-1). The findings of the this study suggest that seeding by early September the most desirable results for botanical composition and grassland productivity in oversown pasture, Cheonan of South 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 목초의 생육특성 및 월동성 평가
 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)
• 김현섭(농촌진흥청 국립축산과학원) | Hyeon Shup Kim (National Institute of Animal Science, Rural Development Administration)
• 최기준(농촌진흥청 국립축산과학원) | Gi Jun Choi (National Institute of Animal Science, Rural Development Administration)