Study on seed biological characteristics of Gentiana crassicaulis Germination Test Standardization for Seeds of Artemisia Sphaerocephala Krasch and Astragalus Adsursens Pall Study on the Standard Methods of Germination Testing in Puccinellia distans Seeds A Preliminary Study on the Geographical Provenance of Zizyphus mauritiana Seed germination characteristics of Nicandra physaloides