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Phosphorus drawdown rate following cessation of repeated manure application to annual crops

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Nutrient Cycling in Agroecosystems Aims and scope Submit manuscript

Abstract

Repeated nitrogen (N)-based manure application to meet crop N requirements could result in phosphorus (P) accumulation to potentially detrimental levels in aquatic environment. A 3-year (2016–2018) field study was conducted to evaluate the rate of P drawdown from cereal-oilseed rotation plots that previously received annual applications of N-based rates of solid (SP–N) or liquid (LP–N) pig manure for 7 years (2009–2015). Plots were fertilized with urea at 91–141 kg N ha−1 with no additional P. At harvest, crop above-ground biomass was sampled to assess yields and P uptake. Soil was sampled each spring and fall to determine Olsen soil test P (STP). During the 3 years of cropping, cumulative dry matter yield was similar in SP–N (24.4 Mg ha−1) and LP–N (24.2 Mg ha−1) plots. However, cumulative P uptake was significantly greater in SP–N (64.4 kg P ha−1) than LP–N (49.0 kg P ha−1) plots. A first-order decay equation showed similar P drawdown rates in SP–N (15%) and LP–N (12%) plots but absolute STP decline was greater in SP–N (35.3 mg kg−1) than LP–N (16.3 mg kg−1) plots. Based on the P drawdown rate, it would require 9 and 6 years to reduce elevated STP levels in SP–N and LP–N plots, respectively to the level prior to manure application (23.8 mg kg−1). Greater soil P buildup with SP–N than LP–N plots, with similar P drawdown rates after cessation of manure application, requires a longer period to bring the STP to an accepted level from SP–N than LP–N soils.

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Acknowledgements

The authors would like to appreciate Justin Soucie for his technical support in plot management. We also acknowledge the Manitoba Livestock and Manure Management Initiative for partial funding of the study.

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Correspondence to Olalekan O. Akinremi.

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Lasisi, A.A., Akinremi, O.O., Kumaragamage, D. et al. Phosphorus drawdown rate following cessation of repeated manure application to annual crops. Nutr Cycl Agroecosyst 125, 63–75 (2023). https://doi.org/10.1007/s10705-022-10255-9

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  • DOI: https://doi.org/10.1007/s10705-022-10255-9

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