Effects of Fertilier,Variety and Planting Density on the Contents of Soybean Isoflavanones

Isoflavones in soybean seed are attached great importance for its physical functions for human health.To elucidate the change trend of isoflavone content under different fertilizer,single factor experiment of nitrogen,phosphorous,and potassium application level with sand culture condition was conducted.Results showed that N-application rate affected isoflavone content significantly,and isoflavone content in soybean seed were respectively increased 54.9% and 23.3% in the low(0.06 g·L-1)N-application rate than that in high(0.48 g·L-1)and middle(0.24 g·L-1)N-application rate.In 2007,these results were further verified in the field conditions.Moreover,effect of variety and planting density on soybean isoflavone content were also tested.The results suggested that variety,planting density,fertilization,and their interactions obviously affected soybean isoflavones content.The variation range of soybean isoflavones content was 5.97% for N-application rate,10.49% for planting densities,and 28.44% for different varieties.Considering the interaction among these three factors,we should pay attention to the optimized combination of three factors for low/high isoflavone production.