Abstract:

In this study, the effect of phosphorus on the content of dietary fiber in different soybean varieties was analyzed. The best phosphorus level of different genotype soybean varieties was explored, in order to increase the content of dietary fiber and improve their qualities. Three soybean varieties (‘heinong-48’, high-protein cultivar; ‘heinong-37’, middle cultivar; and ‘heinong-44’, high-oil cultivar) were investigated. The soybean seeds were planted in pots and fertilized with 0.033 g of nitrogen (N) and potassium oxide (K2O) per kilogram soil. Four levels of phosphorus (P) treatments were designed, which were P1, P2, P3 and P4 (i.e., 0, 0.033, 0.067, 0.100 g of phosphorus pentoxide (P2O5) per kilogram of soil). The content of dietary fiber in different soybean varieties was determined by Enzyme-gravimetric method. In the same variety of soybean, the content of total dietary fiber under the P3 treatment was significantly higher than that of P1, P2 and P4 treatments. The content of total dietary fiber under the P3 treatment in the three soybean varieties (‘heinong-37’; ‘heinong-44’; ‘heinong-48’) compared to the control group was increased by 6.45%, 4.86%, 7.65%, respectively. It showed that the content of total dietary fiber in ‘heinong-44’ was the highest under the same treatment in different soybean varieties. Significant difference was observed in the content of dietary fiber between the three varieties and levels of P treatments. In the 12 treatments combinations, the content of total dietary fiber in ‘heinong-44’ was the highest under the P3 treatment. These findings suggest that phosphorus affects the total content of dietary fiber in the three soybean varieties, and appropriate amounts of P fertilization might contribute to improving the content of dietary fiber.