Solubility of soil phosphorus in extended waterlogged conditions: An incubation study

• Published in: Heliyon 2023-02, Vol.9 (2), p.e13502-e13502, Article e13502
• Main Authors: Rupngam, Thidarat, Messiga, Aimé J., Karam, Antoine
• Format: Article
• Language: English
• Subjects: Available phosphorus; Dissolved organic carbon; Microbial activity; Reduction of ferric (Fe3+) to ferrous (Fe2+) iron; Soil pH
• ISSN: 2405-8440; 2405-8440
• DOI: 10.1016/j.heliyon.2023.e13502

Understanding how extended excess soil moisture exacerbated by extreme weather events affects changes in iron (Fe) chemistry is crucial for assessing environmental risk associated with soil phosphorus (P) in high P soils. The objective of our study was to assess the effects of three soil moisture regimes (field capacity, water saturation, and waterlogging), two Fe3+ nitrate level (Fe3+ nitrate addition and no Fe3+ nitrate addition), and the duration of incubation (0, 3, 7, 14, 21, 28, 35, 49, 63, 90, and 120 days) on the (i) reduction of ferric (Fe3+) to ferrous (Fe2+) iron, (ii) solubility of soil P, and (iii) soil microbial biomass and greenhouse gas emissions. Surface soils (0–20 cm) were collected from a maize silage field located in the Fraser Valley (British Columbia, Canada). Decreased redox potential (Eh) of 155 mV in waterlogged soils coincided with the reduction of Fe3+ to Fe2+ of about 1190 mg kg−1 and an increase in soil pH of 0.8 unit compared to field capacity regime at 120 days after pre-incubation (P