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Soil nitrogen mineralization and its prediction in winter wheat-summer maize rotation system Modeling and Verification of Sandwich Beam with Wooden Skin and Honey-Comb Core Subjected to Transverse Loading KINETICS OF NATIVE POTASSIUM RELEASE AND POTASSIUM SUPPLYING CHARACTERISTICS TN SELECTED SOILS Determination of Total Alkaloids in Luotuopeng Tablets by First Order Derivative Spectrophotometry Determination of Anthranilic Acid in the leaves of Isatidis indigotica by First Order Derivative UV Sperctrophotometry