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crop nitrogen

Catalogue: Ground Cover
An increased use of biofuels and biogas on-farm, along with more efficient fertiliser use, have been cited as the most likely ways for Australia's grains sector to reduce greenhouse gas (GHG) emissions... Options presented in the ABARES report include reduced tillage (already a well-advanced practice), optimising fertiliser use, and the production and use of biofuels and biogas as alternatives to fossil fuels... The biggest source of GHGs from cropping, according to the ABARES report, is nitrous oxide, produced by microbial activity in the soil breaking down nitrogen fertilisers (and nitrogen fixed by legumes) that have not been utilised for crop growth...
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Catalogue: Ground Cover
Trials have shown significant denitrification in summer after post-harvest mineralisation of crop residues such as chickpea crops and canola... In 'normal' dry years, losing soil nitrate through denitrification is a relatively small problem - a bigger issue now is the slowly declining soil nitrogen reserves across the region, especially after multiple above-average yields... Wet summers increase the potential to lose nitrogen through the natural process of denitrification, so the potential for losses is higher under those conditions...
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