Significant ( p < 0.05) and highly significant ( p < 0.01) differences between different treatment groups are identified by lowercase letters (a, b, c, d, e, f, etc.) and uppercase letters (A, B, C, D, E, F, etc.), respectively.
In addition, during the fermentation culture, the rise in the soluble phosphorus content in the fermentation broth slowed down in some stages ( Figure 2 A–C), and some treatment groups even showed a decreasing trend ( Figure 2 A,C).
With the increase in temperature, the ACP activity of the fermentation broth increased gradually ( Figure 3 B) (peak value of 0.392 ± 0.009 μmol/min/mL at 37 °C), and the activity of NP and AKP showed a trend of first decreasing and then increasing.