Two new issues of Royal Society of New Zealand journals are now online, with a feature article from each journal free to read until the end of the month.
In the New Zealand Journal of Agricultural Research, Treweek et al. compare the efficacy of two mitigation technologies for nitrous oxide emissions in dairy winter forage systems.
The abstract says:
Animal urine from grazing animals is responsible for the majority of New Zealand’s nitrous oxide (N2O) emissions. A field lysimeter study was conducted to determine the ability of the combination of the nitrification inhibitor dicyandiamide (DCD) and biochar to mitigate N2O emissions from a winter grazing forage crop soil. The results showed that over a 4 month period, applying cow urine at a rate of 700 kg N ha−1 increased N2O emissions from 0.7 kg N2O-N ha−1 to 14.7 kg N2O-N ha−1. The application of DCD at 20 kg ha−1 reduced total N2O emissions by 65%. The application of biochar at 5 t ha−1 had no significant effect on N2O emissions. The combination of DCD with biochar did not lead to greater N2O reductions than DCD alone. These results indicated that DCD was highly effective whereas biochar was ineffective in reducing N2O emissions in the winter forage soil.
The article can be found here: