Legume straw

As Leguminosenstroh the after are harvest various agriculturally grown legume referred to in the field remaining crop residues. These occur as stalk-like biomass . The straw of the broad bean is particularly relevant for agriculture , while peas , lupins and vetches are usually used as whole plants in animal feed.

Emergence and recovery

The grain-to-straw ratio of broad beans, which are grown on around 23,000 hectares in Germany, is around 1: 2.0. The theoretical ratio for the lupine is 1: 1.7 and for the pea 1: 1.4. Correspondingly, with an average bean yield of around 4.1 t per hectare and year, 8 t of crop residues in the form of straw can theoretically remain on the field. It can be assumed that the recovery rate will be significantly lower than with other straw goods, but no corresponding experience is available.

use

Field bean straw has a relatively high water content when it is harvested, which means that it would have to be re-dried for use in the field. Field bean straw is not used on a relevant scale due to the water content and the high ash content of 8% and other properties that are disadvantageous for combustion.

literature

• Stalk-like biomass: Maisstroh In: Martin Kaltschmitt, Hans Hartmann, Hermann Hofbauer (Hrsg.): Energy from biomass. Basics, techniques and procedures. Springer Verlag, Berlin and Heidelberg 2009; P. 153. ISBN 978-3-540-85094-6 .