Einfluß des Standortes, der N‐Düngung, der Sorte und des Erntezeitpunktes auf den Ertrag an fermentierbaren Zuckern bei Topinamburkraut und ‐knollen

Abstract

Abstract Effect of location, N‐fertilization, variety and harvest date on the yield of fermentable sugars of Jerusalem artichoke tops and tubers In the past, the production of fermentable sugar with Jerusalem artichoke (Helianthus tuberosus L.) resulted nearly exclusively from tubers.It should be investigated to what extent the tops can be used beside tubers as a source of fermentable sugars, connected with studies about diverse components of yield and morphological characteristics.In field trials at three locations in the south‐west of Germany in 1983 and 1984 yields of “Total Fermentable Sugars” (TFZ) with Jerusalem artichoke tops up to 6.7 t/ha were achieved according to variety, N‐fertilization and harvest date. While harvesting Jerusalem artichoke tubers yields of TFZ up to 8.3 t/ha had been feasible.The presented correlations between components of yield and morphological plant characteristics refer to interesting mechanisms of reaction and dependence on the formation of yield with this crop. The high yield level of Jerusalem artichoke and its adaptability to different locations also present this crop as an interesting renewable biomass crop for the south‐west of Germany.