我县位于湘西南部,属山区。县制种基地海拔510多米。1981年全县统一连片制种5250余亩,平均亩产215.3斤,居全省首位。1982年全县制种5061.9亩,平均亩产252.4斤。制种夺高产,花期相遇是关键。解决花期相遇问题,目前一般靠时差和叶差作依据。由于年份间气候和栽培条件的差异,每年 My county is located in southern Hunan, a mountainous area. County seed base more than 510 meters above sea level. In 1981 the county unified contiguous seed production more than 5250 acres, an average of 215.3 kilograms per mu, ranking first in the province. In 1982 the county planted 5061.9 acres, the average yield 252.4 kg. Seed production to win high yield, flowering is the key to encounter. To solve the problem of flowering encounter, the current generally based on time difference and leaf difference. Due to differences in climate and cultivation conditions between years, each year