Correlation Between FDA Enzyme Activity and Soil Fertility Under Combining Application Organic and Nitrogen Fertilizer in Facility Vegetable Field Correlation Between FDA Enzyme Activity and Soil Fertility Under Combining Application Organic and Nitrogen Fertilizer in Facility Vegetable Field Studies of physiological and biochemical bases of Lanthanum on increasing seed vigor of rice Degeneration of Nucleus and Ultracytochemical Localization of Hydrolytic Enzymes during Starchy Endosperm Development in Rice Remobilization of Carbon Assimilates in the Stems during Grain Filling and its Physiological Mechanism in Dry-cultivated Rice