Phosphorus Dynamics in Boreal Podzols Converted from Forest to Agriculture
Phosphorus (P) stands as a non-renewable, essential element crucial for sustaining all life forms, particularly in agriculture, where it ranks as the second most limiting nutrient after nitrogen. The dynamics of global and regional soil P pools and fluxes and the underlying biogeochemical processes exhibit considerable variation influenced by factors such as soil types, vegetation, and management practices.
Despite its significance, a notable gap exists in our understanding of phosphorus fluxes and pool dynamics within the natural and agricultural Podzols of boreal regions of Canada, impeding informed decision-making regarding optimal management strategies. To bridge this knowledge gap, this study pursued the following objectives:
(a) Examined the levels and status of phosphorus in Newfoundland (Nfld) farm soils and investigated their correlation with recommended fertilizer rates across diverse locations and management practices.
(b) Evaluated the effectiveness of different phosphorus extraction and analysis tests (P-test) in assessing phosphorus extractability in natural grassland, forested areas, and agricultural soils.
(c) Determined phosphorus adsorption isotherms for forested and agricultural soil horizons.
(d) Investigated the phosphorus adsorption capacity of soils under long-term management practices.
(e) A greenhouse trial was conducted to assess plant phosphorus uptake from soil layers relevant to areas converted from forested to agricultural use.
This comprehensive investigation aims to contribute valuable insights into phosphorus dynamics in natural and agricultural ecosystems of Nfld and other regions with similar soil and environmental factors, thereby aiding in developing more informed and effective soil management strategies.
Area of Research Interests
- Phosphorus biogeochemistry in the natural and managed environment mainly soil, sediment and water.
- Environmental factors (erosion, freeze-thow cycle, increase temperature and extended grow season) and agricultural managments (such as tillage, fertilizer types, cropping systems) effects on the soil phosphorus dynamic.
- Evaluation of soil tests and analyses and nutrient recommendation protocols.
- Organic waste managment (composting and direct utilization) for soil health enhancement, food production, and environmental protection (phosphorus and carbon sequestration).
