AI Article Synopsis
- The study explored how adding different amounts of KH2PO4 and ground wheat straw affected microbial biomass P in calcareous soil over 90 days.
- Increased inorganic P led to higher microbial biomass P and microbial P concentration, peaking at 71.37 and 105.34 mg x kg(-1) respectively.
- Combining inorganic P with wheat straw reduced microbial biomass P, especially in early stages, but both types of P had strong positive relationships with soil available P.
Article Abstract
In an incubation test, a calcareous soil with low concentration of available P was amended with KH2PO4 (0, 25, 50, and 100 mg P x kg(-1)) and ground wheat straw (5 g C x kg(-1)), and incubated at 25 degrees C for 90 days. The aim was to investigate the change patterns of soil microbial biomass P and microbial P concentration as well as their relationships with soil available P. The results showed that both soil microbial biomass P and microbial P concentration increased with increasing inorganic P addition, with the maximum being 71.37 and 105.34 mg x kg(-1), respectively. The combined application of inorganic P (except 100 mg P x kg(-1)) and wheat straw decreased the soil microbial biomass P and microbial P concentration, being most obvious at early incubation period. Soil microbial biomass P and microbial P concentration had significant positive correlations (P < 0.05) with soil available P (R2 = 0.26 and 0.40, n = 49, respectively). The applied P could rapidly transform into microbial biomass P. The maximum apparent contribution rate of applied P to microbial biomass P was 71%. The added wheat straw could further improve the apparent contribution rate.
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