Amount of nitrogen in cattle manure
2016
Aplocina, E., Latvia Univ. of Agriculture, Jelgava (Latvia) | Aboltins, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Priekulis, J., Latvia Univ. of Agriculture, Jelgava (Latvia)
To develop the Latvian National Inventory reports on greenhouse gas emissions it is necessary to have data on the amount of nitrogen (N) in livestock manure. Such data are available in the Regulations of the Latvian Cabinet of Ministers No. 834. Still, these data can be also obtained from the available literature or calculated according to the methods given in the 2006 IPCC Guidelines, or determined in experimental investigations of the farm manure samples taken on the farms and analysed in laboratories. Therefore, the aim of the present research is to compare the data from literature (L), calculations (T), the Regulations of the Cabinet of Ministers (MK) and the experimental research (E) on the amount of N emitted with cattle manure and to evaluate further suitableness of application of the above mentioned methods. In Latvia, different farm animals are bred, but in the previous research it has been stated that approximately 75 % of the total greenhouse gas emissions created by animal breeding are caused by cattle. Therefore, in the present article the amount of N in manure is analysed for six groups of cattle: dairy cows, their calves and young stock, other (beef) cattle, their calves and young stock. In the research it has been found that all the above described methods give correct research results. But the amount of N in cattle manure is a variable value as it depends on the productivity of the animals, live weight, feeding and other factors. Because of this reason it is necessary to specify the amount of N emitted with cattle manure regularly, and the method of theoretical calculations is the most suitable in the given case. This method can be employed using the statistical data and zootechnical information, but special developed software programme can be used for calculation.
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