The effect of soil moisture at application on the behaviour of four nitrogen fertilisers in the presence of 3,4-dimethylpyrazole phosphate

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A laboratory soil incubation experiment was conducted using the nitrification inhibitor 3,4-dimethylpyrazole phosphate in conjunction with four different agriculturally relevant nitrogenous fertilisers to examine the effects of soil moisture at application on inhibitor behaviour. Soil moisture influenced the mineral N concentrations of the nitrogen fertilisers. Fertilisers that were applied to moistened soils recorded significantly higher mineral N concentrations than when they were applied to dry soils. Of the four fertilisers applied to a moistened soil, urea had the lowest NH4+ and NO3- concentrations after a week of incubation.
However, in dry soils both urea and UAN recorded significantly lower mineral N concentrations. Losses were attributed to volatilisation which occurs as urea is converted to NH4+. Regardless of the soil moisture conditions, DMPP effectively suppressed nitrification for all fertilisers. Fertilisers without DMPP recorded higher NO3- concentrations as the NH4+ was oxidised as part of the nitrification process. Experimental results demonstrate that different soil moisture conditions can influence the behaviour of nitrogen fertilisers but not DMPP.
Original languageEnglish
Title of host publicationProceedings of the 19th Australian Agronomy Conference
Place of PublicationWagga Wagga
PublisherAustralian Society for Agronomy
Number of pages4
Publication statusPublished - 2019
Event19th Australian Agronomy Conference - Wagga Wagga Civic Theatre, Wagga Wagga, Australia
Duration: 25 Aug 201929 Aug 2019 (proceedings) (proceedings)


Conference19th Australian Agronomy Conference
Abbreviated titleCells to Satellites
CityWagga Wagga
OtherThe 19th Australian Agronomy Conference will be held in Wagga Wagga, NSW from
25 – 29 August 2019. In the heart of the Riverina, Wagga Wagga has a range of rural industries across the region. Wagga has everything to offer the agronomy conference being surrounded by a mixed farming zone with irrigation to the west and permanent pasture enterprises to the east.
The conference theme Cells to satellites highlights the integrative nature of agronomy. Each of us work across a range of disciplines to optimise crop or pasture production for productivity and profitability. We have an increasing number of tools available to increase the precision and accuracy of our work; whether it is at the “cellular” level where DNA is mapped and biochemistry is unravelled or using “satellites” for remote sensing or guidance. The opportunities for enhancing our agronomy research is boundless.
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