Soil microorganisms increase Olsen phosphorus from poorly soluble organic phosphate: A soil incubation study

作者：Ángel Velasco‐Sánchez, Nadia Bennegadi-Laurent, Isabelle Trinsoutrot‐Gattin, Jan Willem van Groenigen, Gabriel Y.K. Moinet · 发表于：Soil Use and Management · 年份：2023 · DOI：10.1111/sum.12960 · 被引用次数：12 · 研究领域：Phosphorus and nutrient management、Soil and Water Nutrient Dynamics、Soil Carbon and Nitrogen Dynamics

Abstract The potential shortage of mineral phosphorus (P) sources and the shift towards a circular economy motivates the introduction of new forms of P fertilizers in agriculture. However, the solubility of P in new fertilizers as well as their availability to plants may be low. In this experiment, we incubated an agricultural soil poor in P (28 mg P 2 O 5 kg −1 ) for 63 days in the presence of a range of organic and inorganic poorly soluble P forms commonly found in new fertilizers: hydroxyapatite (P‐Ca), iron phosphate (P‐Fe), phytic acid (P‐Org) and a combination of P‐Ca and P‐Org (P‐Mix). Cellulose and potassium nitrate (KNO 3 ) were added to stimulate microbial activity at the beginning of the incubation. We included a positive control with triple superphosphate (TSP) and negative controls with no P application (with and without cellulose and KNO 3 ). We assessed the fate of the different poorly soluble P forms in NaHCO 3 extracts (Olsen P) over time as a proxy for plant‐available P. Soil microbial biomass, fungal to bacterial ratio, soil respiration, enzymatic activities (β‐glucosidase, arylamidase and acid and alkaline phosphatase), N mineralization and soil pH were also monitored. At the beginning of the incubation, TSP showed the highest Olsen P across all treatments and P‐Fe showed higher levels of Olsen P than the other poorly soluble P forms ( p < .05). During the incubation, the levels of Olsen P decreased over time for TSP (positive control). Contrastingly, Olse...