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Preliminary study on intraspecific hybridization of Cerasus pseudocerasus and interspecific hybridization with C. avium STUDIES ON SEED SETTING PERCENTAGE OF HYBRID RICE Relationships Between the Fruit-bearing Characters of Leymus chinensis Population and Annual Climatic Variations in Natural Meadow in Northeast China A Preliminary Study on Self-incompatibility of Leymus chinensis Influences of row spacing on fertile tillers and characters of seed yield of Elymus sibiricus cv. Chuancao No.2 Screening Parent Resources of Hybrid Rice in New Cytoplasm Male Ste- rile System (CMS-FA) The Stigma Observation on Foxtail Millet (Setaria italica Beauv.) Male-sterile Line “81-16” with High Outcross Seed Setting DETERMINATION OF POLLINIZERS FOR MAJOR GROWN CULTIVARS OF CHINESE SOUTHERN PEAR