THE SUITABILITY OF GRAINS FROM CEREAL CRO PS WITH DIFFERENT N SUPPLY FOR BIOETHANOL PRODUCTION

The properties of grains of different small grain cereals, produced un der increasing N-supply levels, for conversion into bioethanol were in vestigated. Grain material of winterwheat, -rye and -triticale, two cu ltivars each, was used. At two locations, field experiments comprising several N-fertilization levels between 0 and 180kg N/ha were conducte d. The main parameters analysed were the bioethanol output (1 bioethan ol/dt grain dry matter) and the bioethanol yield (1 bioethanol/ha), bo th under addition and without addition of technical enzymes. Furthermo re, the falling numbers, the protein content and the autoamylolytic qu otient (AAQ) were determined. AAQ means the autoamylolytic bioethanol output related to the output under addition of technical enzymes. With a rising N-supply, yields/ha and the protein contents of grain increa sed differently. Combined with increasing protein contents, decreasing bioethanol outputs were measured, particularly with wheat, to a small er extent with triticale, and to an even lesser extent with rye. Only with wheat were the AAQ-values significantly reduced as a consequence of rising N-supply levels. In interaction with growing conditions, cul tivars and N-levels, the bioethanol yields/ha of rye and triticale equ alled or even surpassed the yields of wheat, particularly under autoam ylolytic-conversion processing conditions.