Nitrogen oxides soil emission measuring methods

Poljoprivredni sektor drugi je najveći proizvođač stakleničkih plinova. Ugljični dioksid (CO2), metan (CH4) i dušikov (I) oksid (N2O) imaju izravan učinak na efekt staklenika, dok dušikovi oksidi (NO i NO2, zajednička oznaka NOX) iz poljoprivredne proizvodnje utječu na stvaranje ozona (O3) koji je također staklenički plin. Na poljskom pokusu u mjestu Potok, 2014. godine provedeno je istraživanje emisije dušikovih oksida korištenjem metode pasivnih sakupljača i statičkih komora razvijenih na Institutu za medicinska istraživanja i na Agronomskom fakultetu u Zagrebu. Cilj istraživanja bio je utvrditi prikladnost odabrane metode za mjerenje koncentracije NO2, izračunati emisiju N-NO2 u dvije fenofaze pšenoraži te utvrditi potencijalni utjecaj mineralne gnojidbe na emisiju N-NO2. Istraživanje je pokazalo da je korištena metoda prikladna za mjerenje koncentracije NO2 (izmjerene koncentracije bile su iznad granice detekcije). Nije utvrđena statistički značajna razlika emisije N-NO2 između dva promatrana tretmana (300 kg N i 0 kg N). Izmjerene dnevne vrijednosti emisije N-NO2 kretale su se u rasponu od 1,66 do 7,18 mg/ha na dan, ovisno o fenofazi i tretmanu. Prosječan kumulativan godišnji fluks iznosio je 1,15 g/ha godišnje, odnosno 1,55 g/ha godišnje, ovisno o tretmanu.Agricultural sector is the second largest producer of greenhouse gas emissions. Carbon dioxide (CO2), methane (CH4) and nitrogen oxide (N2O) directly affect the greenhouse effect, whereas nitrogen oxides (NO and NO2, commonly known as NOX) from agricultural production have an effect on the formation of ozone (O3) which is also greenhouse gas. Research of nitrogen oxide emissions was conducted in the field experiment in Potok in 2014. using passive samplers and static chambers developed at the Institute for Medical Research and Occupational Health and Faculty of Agriculture in Zagreb. The aim of the study was to determine the suitability of the selected method for N-NO2 concentration measurement, to calculate N-NO2 emission in two fenophases of triticale and to determine potential impact of mineral fertilization on the N-NO2 emission. Research has shown that the used method was suitable for N-NO2 concentration measurement (measured concentrations were above limit of detection). Statistically significant N-NO2 emission differences between two monitored treatments (300 kg N and 0 kg N) were not observed. Measured daily values of N-NO2 emission ranged from 1,66 to 7,18 mg/ha per day, depending on the phenophase and treatment. Average cumulative annual flux was 1,15 g/ha per year and 1,55 g/ha per year respectively, depending on the treatment