Root nutrient foraging of morphological plasticity and physiological mechanism in Callistephus chinensis The Relationships between Spikelet-Root-Activity and Grain Filling and Ripening in Rice (Oryza sativa) Seasonal dynamics of root respiration of Fraxinus mandushurica Rupr. seedlings with different nitrogen rates Effects of Nitrogen Fertilizer on Rice Seedling Growth and Caryopsis Development and Grain Quality Effect of Nitrogen on Amino Acid and Protein and Protein Component Contents in the Grains of Different Types of Maize Effects of Nitrogen Treatments on Dry Matter Production and Photosynthetic Characteristics of Summer Maize (Zea mays L.) under Super-high Yield Conditions Morphological and Anatomical Responses of Fraxinus mandshurica Seedling Roots to Different Nitrogen Concentrations Effects of nitrogen levels on the morphology characteristics of grain and plant of summer maize (Zea mays L.) under super-high yield conditions