The effect of nitrification inhibitors on nitrous oxide flux from haplic luvisol soil of DASA® 26/13 and ENSIN® fertilisers in a laboratory experiment.

The aim of the paper was to compare the effects of two very similar fertilisers on nitrous oxide (N 2O) flux from soil to the atmosphere in laboratory conditions. The following fertilisers were used: granulated nitrogenous fertiliser DASA® 26/13 with the nitrogen content of 26%, sulphur content of 13%, and nitrogen fertiliser ENSIN® with the nitrogen content of 26%, sulphur content of 13% and nitrification inhibitors dicyandiamide DCD and 1, 2, 4-triazole (TZ). Both fertilisers are produced by the same man ufacturer, DUSLO, Inc., Sala, Slovakia. For both fertilisers, there variants of experiments were carried out for application rates equivalent to 0, 250 and 500 kg ha -1 . The amount of the N 2O emissions released from soil to the atmosphere was measured by a photo-acoustic field gas monitor INNOVA 1412 connected to a multipoint sampler INNOVA 1309. The experiments were conducted for 30 days in laboratory conditions. The fertiliser was incorporated into the soil in sampling tubes to a depth of 80 mm after 24 hours of measurement. Subsequently, after every 24 hours of measurement, another 48 hours was carried out, and this measuring cycle was repeated 10 times. The results of our experiment have confirmed that the fertiliser application rate and type of the fertiliser used have a significant effect on N 2O flux and have confirmed the importance of accurate and uniform application of fertilisers in field conditions in order to eliminate the negative environmental effects.