This study aimed to discuss the optimal seeding and harvesting dates with growing degree days(GDD) via meta-data of whole crop maize(WCM). The raw data (n=3,152) contains cultivation year, cultivars, location, seeding and harvesting dates collected from various reports such as thesis, science journals and research reports (1982-2012). The processing was: recording, screening and modification of errors; Then, the final dataset (n=121) consists of seeding cases (n=29), and harvesting cases (n=92) which were used to detect the optimum. In addition, the optimal periods considering tolerance range and GDD also were estimated. As a result, the optimum seeding and harvesting periods were 14th April ~ 3rd May and 15th August ~ 4th September, respectively; where, their GDDs were 23.7~99.6℃ and 1,328.7~ 1,602.1℃, respectively. These GDDs could be used as a judge standard for selecting the seeding and harvesting dates.

ABSTRACT
Ⅰ. 서 론
Ⅱ. 재료 및 방법
    1. 자료출처
    2. 분석절차 및 방법
Ⅲ. 결과 및 고찰
    1. 표준화 전 파종 및 수확시기의 최적점 탐색
    2. 표준화 후 파종 및 수확시기의 최적점 탐색
Ⅳ. 요 약
Ⅴ. 사 사
Ⅵ. REFERENCES

• 조현욱(강원대학교 동물생명과학대학) | Hyun Wook Jo (College of Animal Life Sciences, Kangwon National University)
• 김시철(한국낙농육우협회) | Si Chul Kim (Korea Daily & Beef Farmers Association)
• 김문주(강원대학교 동물자원공동연구소) | Moon Ju Kim (Institute of Animal Resources, Kangwon National University)
• 김지융(강원대학교 동물생명과학대학) | Ji Yung Kim (College of Animal Life Sciences, Kangwon National University)
• 조무환(농어촌청소년육성재단) | Mu Hwan Jo (Foundation for the Rural Youth)
• 김병완(강원대학교 동물생명과학대학) | Byong Wan Kim (College of Animal Life Sciences, Kangwon National University)
• 성경일(강원대학교 동물생명과학대학) | Kyung Il Sung (College of Animal Life Sciences, Kangwon National University) Corresponding author