Die Korrektur des Trockensubstanzgehaltes von Grassilagen als Substrat für Biogasanlagen

During the process of determining DM content in silages, volatile compounds (fermentation acids and alcohols) are lost. Therefore, the DM content measured in the conventional way has to be corrected afterwards. If uncorrected or incompletely corrected, calculations on nutrient contents, as well as specific biogas yields will give false results, causing experimental data to be misleading [2, 3]. A sufficiently exact calculation of the volatile compounds is only possible with a full chemical analysis of all the fermentation acids and alcohols contained in the silages. After an equation for corrected DM values for maize silages is proposed [6], an improved and substrate specific equation for DM correction for grass silage is recommended here.