A Study on the Classification of Seed and Seedling Vigour of Larix gmelini

Seed vigour of Larix gmelini Rupr. has been studied by vertical plate germinator. (1) Height of seedling were measured,germination index and vigour index were caculated. (2) Seedlings were classified into five classes according to the radicle, seedling height and seminal leaf. To avoid the error caused by subjective judgment, the author has classified the seedling height by its standard deviation, as a result strong seedling percent and seedling stand percent were determined. In consequence the seedling classification was improved. (3) The most suitable pretreatment methods for raising Larix gmelini seed vigour were screened out.