Since the first development of the high-yield variety ‘Tongil’ that led to the self-sufficiency of rice production in Korea, plant architecture has improved steadily to increase yield components. The purpose of this study was to analyze the chronicle shift of agronomic traits of high-yield rice, to provide future breeding goals. The culm length increased sharply from 65 cm in the 1970s to 80 cm in the 1990s, and then decreased slightly to 77 cm in the 2010s. The panicle length increased continuously from 22.8 cm in the 1990s, to 24.3 cm in the 2010s. The average number of seeds per panicle increased from 118 in the 1970s, to 142 in the 1990s, and decreased continuously to 119 in the 2010s. The ripening ratio increased from 75% in the 1970s to 83% in the 1980s, and decreased to 77% in the 1990s and after that, held steady at 85%. Thousand-grain weight was lowest in the 1980s at 20.9 g and sharply increased to 25.8 g in the 1990s, and decreased continuously to 23.3 g in the 2010s. The production of high-yield varieties increased significantly from the 1970s from 510 kg/10a to 769 kg/10a in the 2010s.

ABSTRACT
서 론
재료 및 방법
결과 및 고찰
    가. 주요 농업형질 변화 추이
    나. 수량구성요소 변화 추이
    다. 수량성 및 아밀로스 함량 변이
적 요
ACKNOWLEDGMENTS
REFERENCES

• 김기홍(경북대학교 농업생명과학대학 농산업학과) | Ki-Hong Kim (Dept. of Farm management, Kyungpook National University, Daegu, 41566, Korea)
• 이기환(경북대학교 농업생명과학대학 농산업학과, 경북대학교 농업과학기술연구소) | Gihwan Yi (Dept. of Farm management, Kyungpook National University,Institute of Agricultural Science and Technology, Kyungpook National University,) Corresponding author