Stability of Six Soybean Isoflavones Solution Effects of Legumes Intercropping with Oat on Photosynthesis Characteristics of and Grain Yield Genetic Analysis and QTL Mapping of Isoflavone Contents and Its Components in Soybean Development and Utilization of CAPS/dCAPS Markers Based on the SNPs Lying in Soybean Cyst Nematode Resistant Genes Rhg4 Key Components of Eating Quality and their Dynamic Accumulation in Vegetable Soybean Varieties [Glycine max (L.) Merr.]