Zur Eignung des Kornguts unterschiedlich stickstoffgedüngter Getreidebestände als Rohstoff für die Bioethanolproduktion

The Suitability of Grains from Cereal Crops with Different N Supply for Bioethanol Production
The properties of grains of different small grain cereals, produced under increasing N-supply levels, for conversion into bioerhanol were investigated. Grain material of winterwheat, -rye and -triticale, two cultivars each, was used At two locations, field experiments comprising several N-fertilization levels between 0 and 180 kg N/ha were conducted. The main parameters analysed were the bioethanol output (1 bioethanol/dt grain dry matter) and the bioethanol yield (1 bioethanol/ha), both under addition and without addition of technical enzymes. Furthermore, the falling numbers, the protein content and die autoamylolytic quotient (AAQ) were determined. AAQ means the autoamylolytic bioethanol output related to die output under addition of technical enzymes. With a rising N-supply, yields/ha and die protein contents of grain increased differently. Combined with increasing protein contents, decreasing bioethanol outputs were measured, particularly with wheat, to a smaller extent with triticale, and to an even lesser extent with rye. Only with wheat were die AAQ-values significantly reduced as a consequence of rising N-supply levels. In interaction with growing conditions, cultivars and N-levels, the bioethanol yields/ha of rye and triticale equalled or even surpassed the yields of wheat, particularly under autoamylolytic-conversion processing conditions.