The effect of prolonged stratification and shading on the emergence of Pseudotsuga menziesii (Mirb.) Franco seedlings

The Douglas fir has been cultivated in Europe since the mid-19th century, but its artificial regeneration leads to a low yield of seedlings. It could be improved by prolonged pre-sowing treatment (cold stratification seeds) or early shading sowings, so that their effect on five seed lots and emergence growth seedlings were analysed. One lot came from USA; four Czech Republic. germination capacity rate analysed for without after 21-day 49-day stratification. was tested variants (shaded unshaded treatment) autumn sowing (unshaded treatment). results show maximal full seeds is achieved increases rate, especially with lower vitality. biggest seedlings, terms length biomass above-ground part root system, emerged sown autumn. combination 3-week spring can accelerate seedling increase seedlings; achieve more part, system compared stratified seeds. Comparable better sowing.