Relationship between Development of Spike Vascular Bundle and Sink Capacity of Ear and Kernel in Maize (Zea mays L.) Effect of rare earth on composition of bleeding sap of rice Effects of Planting Densities on Basal Stem Vascular Bundles and Root Bleeding Sap of Different Density-tolerant Maize Cultivars Effects of bleeding sap of sponge gourd on the respiration and storage qualities of post-harvest Pleurotus citrinopileatus Responses of Ethylene and ACC in Rice Grains to Soil Moisture and Their Relation to Grain Filling Effects of simulated acid rain on growth and bleeding sap amount of root in Quercus mongolica Effects of Potassium Application Rate on Stem Lodging Resistance of Summer Maize under High Yield Conditions