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Fertilizer efficiency in wheat is reduced by ozone pollution

Artikel i vetenskaplig tidskrift
Författare Malin Broberg
Johan Uddling
Gina Mills
Håkan Pleijel
Publicerad i Science of the Total Environment
Volym 607-608
Sidor 876-880
ISSN 0048-9697
Publiceringsår 2017
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 876-880
Språk en
Länkar https://doi.org/10.1016/j.scitotenv...
Ämnesord Nitrogen, Nitrogen translocation, O3, Phosphorus, Potassium, Triticum aestivum
Ämneskategorier Biologiska vetenskaper, Geovetenskap och miljövetenskap

Sammanfattning

Inefficient use of fertilizers by crops increases the risk of nutrient leaching from agro-ecosystems, resulting in economic loss and environmental contamination. We investigated how ground-level ozone affects the efficiency by which wheat used applied nitrogen (N) fertilizer to produce grain protein (NE P , N efficiency with respect to protein yield) and grain yield (NE Y , N efficiency with respect to grain yield) across a large number of open-top chamber field experiments. Our results show significant negative ozone effects on NE P and NE Y , both for a larger data set obtained from data mining (21 experiments, 70 treatments), and a subset of data for which stomatal ozone flux estimates were available (7 experiments, 22 treatments). For one experiment, we report new data on N content of different above-ground plant fractions as well as grain K and P content. Our analysis of the combined dataset demonstrates that the grain yield return for a certain investment in N fertilizer is reduced by ozone. Results from the experiment with more detailed data further show that translocation of accumulated N from straw and leaves to grains is significantly and negatively affected by ozone, and that ozone decreases fertilizer efficiency also for K and P. As a result of lower N fertilization efficiency, ozone causes a risk of increased N losses from agroecosystems, e.g. through nitrate leaching and nitrous oxide emissions, a hitherto neglected negative effect of ozone. This impact of ozone on the N cycle implies that society is facing a dilemma where it either (i) accepts increased N pollution and counteracts ozone-induced yield reductions by increasing fertilization or (ii) counteracts N pollution under elevated ozone by reducing fertilization, accepting further yield loss adding to the direct effect of ozone on yield.

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