Impact of Biologically Active Substances of Biosolids on Poa pratensis L. Growth under Drought Stress Influence of Applying Slow Release Nitrogen Fertilizers in Autumn on Cold Resistant Turf-type Bluegrass(Poa pratensis L.) Study on Plant Regeneration from Midnight Ⅱ Effect of Vegetation Concrete on the Leaf Epidermis Cell of Two Varieties of Poa pratensis L. Taming breeding of Rhizom-type Forage Variety Poa pratensis L. var. Gaud. cv. Qinghai in Alpine Area Influence of Potassium on Heat Resistance of Kentucky Bluegrass Protoplasts Culture and Fusion from Callus of Poa pratensis L. PROTEOMIC ANALYSIS OF A WINNKLE-LEAF MUTANT IN Poa pratensis L.INDUCED BY AEROSPACE ENVIRONMENT MUTAGENTIC EFFECTS OF AEROSPACE ON Poa pratensis L.Ⅱ——PHOTOSYNTHESIS CHARACTERS AND CHLOROPHYLL CONTENTS A Study on the Technique of Plant Regeneration from Mature Seed Embryo of Kentucky bluegrass in vitro Resistance Against Brown Patch of Different Poa pratensis Cultivar Leaf Epidermis Ultra-Microstructure Associated with Drought Resistance In Poa Pratensis Cultivars Germplasm Resources of Genus Poa L.in Beijing Area Effects of NaCl and Drought Stress on Quality and Chlorophyll Fluorescence Parameters of Kentucky Bluegrass RESEARCH ON APOMIXIS IN KENTUCKY BLUEGRASS