Sheep Grazing Impacts on Soil Health and Pasture Quality at Commercial Solar Sites in Northeastern USA
Solar Sheep Grazing and Site Conditions
DOI:
https://doi.org/10.52825/agripv.v3i.1402Keywords:
Solar Grazing, Soil Health, Pasture Conditions, Ecosystem Health, Forage QualityAbstract
As solar sheep grazing continues to gain traction, it is important to emphasize soil health and pasture quality. Therefore, this study was performed to collect in-field data from 28 grazed and 3 non-grazed commercial solar sites to determine how grazing influences solar site health, associated ecosystem health, forage nutritive quality, and pasture conditions at Northeastern United States of America solar sites from 2022-2024. The majority of the selected sites were previously cropland. Construction of sites was between 2015-2020 with local graziers later joining the operation to create agrivoltaic systems. Sites were selected by their ability to contribute to the knowledge base over the duration of the study, provide relevant information about innovative co-location strategies and the willingness of all parties involved in the solar site maintenance to share information. Solar grazed sites tended to (p=0.06) have higher soil organic matter than non-grazed sites, with values of 4.14% and 3.70% respectively. Soil pH was significantly higher (p=0.01) in grazed sites, with an average of 6.20 compared to 5.81 in non-grazed sites, demonstrating the potential for solar grazing to improve solar site soil health. Crude protein was consistently significantly higher (p<0.001) in under panel areas for all seasons and years, while better digestibility was seen in under panel areas in Fall 2023. While not statistically significant (p=0.07), pasture condition scores increased between 2022 and 2023, suggesting that sheep grazing may have the potential to improve solar site pasture quality over time. Overall, solar sheep grazing helps to create a beneficial dual-use environment.
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References
F. J. M. M. Nijsse, J. F. Mercure, N. Ameli, F. Larosa, S. Kothari, J. Rickman, P. Vercou-len, and H. Pollitt, “The momentum of the solar energy transition,” Nat. Commun., vol. 14, no. 6542, Oct. 2023, doi: https://doi.org/10.1038/s41467-023-41971-7.
N. Kochendoerfer, and M. L. Thonney. “Grazing Sheep on Solar Sites in New York State: Opportunities and Challenges.” American Solar Grazing Association. https://solargrazing.org/wp-content/uploads/2021/02/Solar-Site-Sheep-Grazing-in-NY.pdf (Accessed Jan. 2025).
A. C. Andrew, C. W. Higgins, M. A. Smallman, M. Graham, and S. Ates, “Herbage yield, lamb growth and foraging behavior in agrivoltaic production system,” Front. Sustain. Food Syst., vol. 5, April, 2021, doi: https://www.frontiersin.org/articles/10.3389/fsufs.2021.659175. DOI: https://doi.org/10.3389/fsufs.2021.659175
K.T. Sharpe, B. J. Heins, E. S. Buchanan, and M. H. Reese, “Evaluation of solar photo-voltaic systems to shade cows in a pasture-based dairy herd,” Journal of Dairy Science, vol. 104, no. 3, pp. 2794–2806, March, 2021, doi: https://doi.org/10.3168/jds.2020-18821.
A. S. C. Maia, E. de A. Culhari, C. de F. C. Fonsêca, H. F. M. Milan, and K. G. Ge-bremedhin, “Photovoltaic panels as shading resources for livestock,” Journal of Cleaner Production, vol. 258, no. 120551, June, 2020, doi: https://doi.org/10.1016/j.jclepro.2020.120551.
N. Kochendoerfer, L. Hain, and M. L. Thonney. “The Agricultural, Economic and Envi-ronmental Potential of Co-Locating Utility Scale Solar with Grazing Sheep.” American Solar Grazing Association. https://solargrazing.org/wp-content/uploads/2021/02/Atkinson-Center-Full-Report.pdf (Accessed Jan. 2025).
“Natural Resources Conservation Service Guide to Pasture Condition Scoring.” United States Department of Agriculture. https://www.nrcs.usda.gov/sites/default/files/2022-06/National_Pasture_Condition_Scoring_Guide_and_Score_Sheet_-_January_2020.pdf (Accessed Jan. 2025).
“Submitting a Sample.” Dairy One. https://dairyone.com/services/forage-laboratory-services/submitting-a-sample/ (Accessed Jan. 2025).
“Testing Services.” Cornell Soil Health Laboratory. https://soilhealthlab.cals.cornell.edu/testing-services/ (Accessed Jan. 2025).
R. Yavari, D. Zaliwciw, R. Cibin, and L. McPhillips, “Minimizing environmental impacts of solar farms: A review of current science on landscape hydrology and guidance on stormwater management.” Environ. Res.: Infrastruct. Sustain., vol. 2, no. 3, Aug., 2022, doi: https://doi.org/10.1088/2634-4505/ac76dd.
C. H. Lin, M. L. McGraw, M. F. George, and H. E. Garrett, “Nutritive quality and morpho-logical development under partial shade of some forage species with agroforestry poten-tial,” Agroforestry Systems, vol. 53, pp. 269-281, Nov., 2001, doi: https://doi.org/10.1023/A:1013323409839.
B. D. Soane, “The role of organic matter in soil compactibility: A review of some practical aspects,” Soil and Tillage Research, vol. 16, no. 1-2, pp. 179-201, April, 1990, doi: https://doi.org/10.1016/0167-1987(90)90029-D
“Nutrient Management Guide (RB209); Section 1 Principles of nutrient management and fertiliser use.” Agriculture and Horticulture Development Board. https://ahdb.org.uk/knowledge-library/rb209-section-1-principles-of-nutrient-management-and-fertiliser-use (Accessed Jan. 2025).
“NRCS Soil Health Journey Factsheet.” National Resources Conservation Service. https://www.nrcs.usda.gov/sites/default/files/2022-08/NRCS%20Soil%20Health%20Journey%20factsheet_FINAL.pdf (Accessed Jan. 2025).
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Copyright (c) 2025 Alyssa Andrew, Lexie Hain, Jonathan Barter, Zachary Goldberg, Allison Desario, Kevin Antoszewski, Alissa White, Caro Roszell
This work is licensed under a Creative Commons Attribution 4.0 International License.
Accepted 2025-02-14
Published 2025-03-21