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Nitrous oxide, carbon dioxide and oxygen concentrations in soil air influenced by organic and inorganic fertilizers and soil compaction


, : Nitrous oxide, carbon dioxide and oxygen concentrations in soil air influenced by organic and inorganic fertilizers and soil compaction. Norwegian Journal of Agricultural Sciences 7(1): 1-10

The soil air composition under ley was studied during the fifth year of a field experiment carried out in a humid climate and with different fertilization and soil compaction treatments. The fertilization treatments were: NPK fertilizer (220 kg NH-4 NO-3-N ha-1); cattle slurry (CS) (189 kg total N ha-1); Cs (131 kg total N ha-1); CS (84 kg total N ha-1); and an unfertilized treatment. The soil was experimentally compacted by two passes with a tractor, wheel by wheel, shortly before fertilization. Soil air at a depth of 7-12 cm was sampled through stationary soil air samplers. NPK fertilization resulted in consistently higher N-2O concentrations than in the other treatments. Cattle slurry applications did not significantly affect the N-2O concentrations. The soil compaction resulted in higher N-2O concentrations especially for NPK-fertilized treatments (max concentration 563 ppm). Compacted soil had lower O-2 concentrations and higher CO-2 concentrations than the uncompacted soil. There was no effect of fertilization on the concentrations of O-2 and CO-2 in soil air.

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