Abstract
Outdoor hog-rearing operations are of interest for both producers and consumers due to high product quality, animal welfare status, and low input and potential environmental risks. However, hog manure is rich in phosphorus (P), an environmentally sensitive nutrient, and distribution of different P fractions down the soil profile in these production systems is not well understood. The objective of this study was to determine the spatial variability of soil P in different soil depth intervals following 1-year outdoor farrowing sows in a 0.5-ha paddock in cold-temperate climate of Eastern Canada. Soil samples were collected with 0–15, 15–30, and > 30 cm depth intervals (up to 60 cm or the depth that sampling was possible) in grazing/rooting, feeding, wallow, and farrowing hut areas. Soil samples were analyzed for Olsen P (Pol), organic P (PO), and total P (PT). Areas with more frequent presence of hogs showed 45–80% greater Pol concentrations, and movement of soluble PO down the soil profile was higher in these areas compared with the grazing/rooting area. The PO formed 80% of PT throughout the paddock, and the spatial distribution of PO was similar to PT in all soil depth intervals but different from Pol. Results also showed that PO concentrations in the paddock decreased at > 30 cm depth except for the feeding area. Findings of this study reveal that farrowing sow cycle in an outdoor hog-rearing farm setting can result in hot spots of P, which enhance the risk of environmental pollution.
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Acknowledgments
The in-kind support for this project from Harley Farms is highly appreciated. Dr. Mehdi Sharifi’s position was supported by Canada Research Chair Program of Canada Foundation for Innovation at the time of conducting this experiment and by Agriculture and Agri-Food Canada during the preparation of this manuscript. Authors appreciate the geostatistical support by Dr. Majid Ramazani. We thank Melissa Johnston for the technical assistance.
Funding
The funding for this study was provided by the Natural Sciences and Engineering Research Council of Canada (NSERC) Engage program.
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Sharifi, M., Messiga, A.J., Asefpour Vakilian, K. et al. Spatial distribution of soil phosphorous fractions following 1-year farrowing sows in an outdoor hog-rearing farm in Eastern Canada. Environ Monit Assess 192, 322 (2020). https://doi.org/10.1007/s10661-020-08260-y
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DOI: https://doi.org/10.1007/s10661-020-08260-y