STUDIES ON THE ACTION THRESHOLD OF RICE STRIPED BORER ON REGENERATE RICE A PATH ANALYSIS OF THE EPIDEMIC OF RICE NECK BLAST AND THE FORECAST MODEL A brief introduction of structural equation model and its application in ecology Risk division on winter wheat suffering from spring wet damages in Jiangsu Province Effects of nitrogen on agronomic traits and dry matter yield and their relationship in sweet sorghum Path Analysis on the Crown Characteristics and Growth of Manglietia yuyuanensis in Mixed Stands Effects of Cortical Thickness and Stele Diameter on Variations of Root Diameter in Fraxinus mandshurica and Larix gmelinii Effects of gap size on seedling natural regeneration in artificial Pinus tabulaeformis plantation. NATURAL REGENERATION OF ABIES FAXONIANA ALONG RESTORATION GRADIENTS OF SUBALPINE DARK CONIFEROUS FOREST IN WESTERN SICHUAN, CHINA Association Analysis between Seed Yield and Its Component Factors of Cichorium intybus L. Freeze resistance analysis of different wheat cultivars based on the relationships between physiological indices and grain yield. THE RELATIONSHIP BETWEEN CROWN CHARACTERISTICS AND STEMWOOD GROWTH OF NEW POPLAR CLONES A Study on Soil Suitablility for Growth of Rhizome of Curcuma longa L. Study on the adaptability of Eucalyptus grandis× E.urophylla in karst hills(Ⅰ):photosynthetic physiological ecology characteristics in spring Studies on Phenotypical Characteristics Gradient Variation of Melia azedarach Study on long-term experiment of crop rotation and fertilization in the loess plateau Ⅱ. Relationship between soil enzyme activities and soil fertility Analysis of variation in physio-biochemical characteristics and cold resistance in winter rapeseed F2 populations Path analysis of morphological parameters of Convolvulus tragacuthoiedes population and individual biomass modeling of subshrubs Correlation and Path Analysis on Main Agronomic Traits of Progeny from Space Mutation Maize Inbred Lines Effects of Stalk Cell Wall and Tissue on the Compressive Strength of Maize Genetic Variability and Interrelationships among Morphological and Agronomical Characteristics in Rhizome Lotus (Nelumbo nucifera Gaertn.ssp.nucifera) Germplasms