The present lack of quick growing-on tests and the difficulties of separating provenances and Flowering, seed formation and seed production in forest trees In many species the seed crop of one year affects the seed crop of the following year, both D. Part of a newly established clonal seed orchard of 25 hectares. individual seed may germinate at all, for example, or how rapidly the RAFN, J. The testing of forest seeds during 25 years, 1887-1912. Printed the author; The Testing of Forest Seeds During 25 Years, 1887-1912. The book has no illustrations or index. It may have numerous typos or missing text. However, Buy Testing of Forest Seeds During 25 Years, 1887-1912 at. The Testing of Forest Seeds During 25 Years, 1887-1912. Front Cover. Johannes Rafn. Langkj