Abstract
Government priorities on provincial Nutrient Management Planning (NMP) programs include improving the program effectiveness for environmental quality protection, and promoting more widespread adoption. Understanding the effect of NMP on both crop yield and key water-quality parameters in agricultural watersheds requires a comprehensive evaluation that takes into consideration important NMP attributes and location-specific farming conditions. This study applied the Soil and Water Assessment Tool (SWAT) to investigate the effects of crop and rotation sequence, tillage type, and nutrient N application rate on crop yield and the associated groundwater \({\text{NO}_{3}}^{ - } {\text{-N }}\) leaching and sediment loss. The SWAT model was applied to the Thomas Brook Watershed, located in the most intensively managed agricultural region of Nova Scotia, Canada. Cropping systems evaluated included seven fertilizer application rates and two tillage systems (i.e., conventional tillage and no-till). The analysis reflected cropping systems commonly managed by farmers in the Annapolis Valley region, including grain corn-based and potato-based cropping systems, and a vegetable-horticulture system. ANOVA models were developed and used to assess the effects of crop management choices on crop yield and two water-quality parameters (i.e., \({\text{NO}_{3}}^{ - } {\text{-N }}\) leaching and sediment loading). Results suggest that existing recommended N-fertilizer rate can be reduced by 10–25 %, for grain crop production, to significantly lower \({\text{NO}_{3}}^{ - } {\text{-N }}\) leaching (P > 0.05) while optimizing the crop yield. The analysis identified the nutrient N rates in combination with specific crops and rotation systems that can be used to manage \({\text{NO}_{3}}^{ - } {\text{-N }}\) leaching while balancing impacts on crop yields within the watershed.
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The authors acknowledge funding for the research study from Agriculture and Agri-Food Canada (AAFC), under the Watershed Evaluation of Beneficial Management Practices (WEBs) project.
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Amon-Armah, F., Yiridoe, E.K., Ahmad, N.H.M. et al. Effect of Nutrient Management Planning on Crop Yield, Nitrate Leaching and Sediment Loading in Thomas Brook Watershed. Environmental Management 52, 1177–1191 (2013). https://doi.org/10.1007/s00267-013-0148-z
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DOI: https://doi.org/10.1007/s00267-013-0148-z