Dissolved organic carbon in leachate after application of granular and liquid N–P–K fertilizers to a sugarcane soil
Article
Article Title | Dissolved organic carbon in leachate after application of granular and liquid N–P–K fertilizers to a sugarcane soil |
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ERA Journal ID | 5853 |
Article Category | Article |
Authors | Pittaway, P. A. (Author), Melland, A. R. (Author), Antille, D. L. (Author) and Marchuk, S. (Author) |
Journal Title | Journal of Environmental Quality |
Journal Citation | 47 (3), pp. 522-529 |
Number of Pages | 8 |
Year | 2018 |
Publisher | John Wiley & Sons |
Place of Publication | United States |
ISSN | 0047-2425 |
1537-2537 | |
Digital Object Identifier (DOI) | https://doi.org/10.2134/jeq2017.11.0433 |
Web Address (URL) | https://dl.sciencesocieties.org/publications/jeq/abstracts/0/0/jeq2017.11.0433 |
Abstract | The progressive decline of soil organic matter (SOM) threatens the sustainability of arable cropping worldwide. Residue removal and burning, destruction of protected microsites, and the acceleration of microbial decomposition are key factors. Desorption of SOM by ammonia-based fertilizers from organomineral complexes in soil may also play a role. A urea- and molasses-based liquid fertilizer formulation and a urea-based granular formulation were applied at recommended and district practice rates, respectively, to soil leaching columns, with unfertilized columns used as controls. The chemistry of leachate collected from the columns, filled with two sandy soils differing in recent cropping history, was monitored over eight successive wet–dry drainage events. The pH, electrical conductivity, and concentration and species of N in leachate was compared with the concentration and aromaticity of dissolved organic C (DOC) to indicate if salt solutions derived from the two fertilizers extracted SOM from clay mineral sites. Cation exchange capacity and exchangeable cations in the soil were monitored at the start and end of the trial. Fertilizer application increased DOC in leachate up to 40 times above the control, but reduced aromaticity (specific ultraviolet light absorbance at 253.7 nm). Dissolved organic C was linearly proportional to leachate NH4–N concentration. Exchangeable Ca and Mg in soil from fertilized columns at the end of both trials were significantly lower than in unfertilized soil, indicating that ammonium salt solutions derived from the fertilizers extracted cations and variably charged organic matter from soil mineral exchange sites. Desorption of organic matter and divalent cations from organomineral sites by ammonia-based fertilizers may be implicated in soil acidification. |
Keywords | loss of soil organic matter, displacement of SOC |
ANZSRC Field of Research 2020 | 410604. Soil chemistry and soil carbon sequestration (excl. carbon sequestration science) |
410101. Carbon sequestration science | |
410601. Land capability and soil productivity | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | National Centre for Engineering in Agriculture |
University of Southern Queensland | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q49zw/dissolved-organic-carbon-in-leachate-after-application-of-granular-and-liquid-n-p-k-fertilizers-to-a-sugarcane-soil
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