延边朝鲜族自治州位于吉林省东部山区。全年无霜期一百二十天到一百三十天。土质肥沃,水源充沛,适合于水稻生产。但因低温冷害,影响水稻栽培,出现水稻产量不高不稳现象。为了战胜低温冷害,提出了培育早育壮秧问题。经过多年实践证明,早育壮秧是水稻高产稳产的基本条件之一。 Yanbian Korean Autonomous Prefecture is located in the eastern mountains of Jilin Province. Frost-free period throughout the year from one hundred twenty days to one hundred and thirty days. Fertile soil, abundant water, suitable for rice production. However, due to cold damage, affecting rice cultivation, there is not high and unstable rice yield. In order to overcome the chilling injury, raised the issue of nurturing and early breeding strong seedlings. After many years of practice, early seedling is one of the basic conditions for high and stable yield of rice.