Chemical and isotopic characterization of nitrate retained and leached from soil after manure fertilization-by lysimeter experiments

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Abstract

Increase of soil fertilization produces an increase of N exported to the hydrosphere. The amount of nitrate that reaches the aquifers is controlled by processes affecting N-species within the soils. The most relevant processes are nitrification, denitrification, assimilation, mineralization, and immobilization. This work studies the fate of N compounds in soil after manure application in a lysimeter study. To this end the isotopic composition of N and O of dissolved nitrate (δ15N-NO and δO-NO) was studied coupled with the evolution of N-compounds retained and leached from the soil. Results showed an increase in the δ15N-NO of the leached nitrate towards values similar to the δ15N-NH 4 from the applied manure. The highest δ15N-NO values were measured after 100 days of manure application, and thereafter, values decreased progressively towards the initial δ15N-NO of the soil before manure application.

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Otero, N., Llovet, A., Carrey, R., Ribas, A., Domene, X., Mattana, S., … Soler, A. (2019). Chemical and isotopic characterization of nitrate retained and leached from soil after manure fertilization-by lysimeter experiments. In E3S Web of Conferences (Vol. 98). EDP Sciences. https://doi.org/10.1051/e3sconf/20199812016

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