Predicting the Leaf Area and Leaf Dry Weight of Elaeagnus mollis in Shanxi Relationship between Main Chemical Components in Leaf and Leaf Length in Different Positions in Tobacco (Nicotiana tabacum L.) MEASURING LEAF AREA IN PEAR TREE USING REGRESSION EQUATION METHOD Effects of Nitrogen Application Amount and Planting Density on Angle and Length of Top Three Leaves in Double-Cropping Rice QTL Analysis for Flag Leaf Length in a Rice DH Population under Multi Environments Morphological Responses of Carex argyi to Water Fluctuation in Swan Islet Wetland Stress Tolerance of Poplar Ⅰ-72 Plantation for Domestic Wastewater