Factor Analysis and Comprehensive Assessment of Phenotypic Selection of Officinal Neem Superior Trees Criteria for Selecting Superior Trees of Paraserianthes falcataria Study on Grafted Tissue Rejuvenation Technology and Rapid Propagation of Paulownia fortunei Superior Trees STUDY ON MOLECULAR GENETIC VARIATION OF SUPERIOR TREES IN CHINESE FIR(CUNNINGHAMIA LANCEOLATA(LAMB.)HOOK. STUDY ON MATERIALS SELECTION FOR ESTABLISHING ORCHARD OF UTILIZING GINKGO BILOBA LEAF Superior tree selection of Chinese date Zhongyang muzao in Jiaxian County,Shaanxi Study on the Main Traits Genetic Analysis and Superior Tree Selection of Hybrid Offsprings of ‘Lvling’ Walnut Research on Superior Tree Selection with the Method of Dominant Contrast and Estimation of the Corresponding Gain Research on Grafting Techniques of Superior Acacia mangium and Its Hybrid Study on Criterion for Selecting Betula alnoides Superior Trees