Abstract
There are concerns about the impact of maize cultivation with high applications of nitrogen (N) and phosphorus (P) on water quality in surface waters in Mediterranean Central Chile. This study estimated the contribution of N and P from maize fields to nearby drainage channels and evaluated the effects in water quality. An N and P budget was drawn up for three fields managed with a maize-fallow system, El Maitén (20.7 ha), El Naranjal (14.9 ha) and El Caleuche (4.2 ha), and water quality variables (pH, EC, dissolved oxygen, total solids, turbidity, NO3-N, NH4-N, PO4 3−, COD, total N, total P and sulphate) were monitored in nearby drainage channels. The N and P balances for the three fields indicated a high risk of N and P non-point source pollution, with fertiliser management, soil texture and climate factors determining the temporal variations in water quality parameters. Elevated levels of NH4-N and PO4 3− in the drainage channels were usually observed during the winter period, while NO3 − concentrations did not show a clear tendency. The results suggest that excessive slurry application during winter represents a very high risk of N and P runoff to drainage channels. Overall, great emphasis must be placed on good agronomic management of fields neighbouring drainage channels, including accurately calculating N and P fertiliser rates and establishing mitigation measures.
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We thank Professor María Adriana Carrasco, Dr. Julio Haberland and Dr. Víctor García de Cortázar from the University of Chile for giving valuable advice and suggestions on the manuscript.
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This study was funded by FONDECYT de Iniciación 2011 project N°11110464 and by Universidad de Chile project U-Inicia 11/09.
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The authors declare that they have no competing interests.
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Corradini, F., Nájera, F., Casanova, M. et al. Effects of maize cultivation on nitrogen and phosphorus loadings to drainage channels in Central Chile. Environ Monit Assess 187, 697 (2015). https://doi.org/10.1007/s10661-015-4919-2
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DOI: https://doi.org/10.1007/s10661-015-4919-2