Hay infusion

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Hay infusion after 2 weeks

The Heuaufguss is a popular method for microscopic purposes microorganisms to breed. This was already practiced in the 17th century. Permanent stages of various microorganisms ( infusoria ) adhere to the dead plant parts or in the earth , which return to their active state when water is supplied.

Organisms

The following can be enriched in a hay infusion:

Manufacturing

For a hay infusion, use a larger glass (e.g. 1000 ml beaker or mason jar) and a handful of hay . The hay is placed in the jar along with about 400 ml of water (preferably from a natural body of water such as a pond ) and sealed in order to reduce evaporation. Then the hay infusion is left to stand at room temperature (approx. 20-25 ° C). Putrefaction processes quickly set in, in which the bacteria multiply quickly. These and the remains of the hay in turn serve as food for the various unicellular organisms. The use of tap water results in a significantly lower species diversity of the microorganisms.

After one or two days, you can find numerous microorganisms, especially on the surface of the hay infusion ( scum ) and on the surface of stalks and leaves.

In general, it is important to pay attention to hygiene when handling hay infusions , as pathogens can also multiply among the microorganisms.

Instead of hay, lettuce leaves can also be used - preferably organically grown lettuce (to avoid pesticides). Certain interesting organisms also multiply if you add a little soil or moss to the hay infusion .

The hay infusion, which then often smells noticeably, should be disposed of in the sink after 4 weeks at the latest.

literature

  • Norbert Sapper, Helmut Widhalm: Simple biological experiments. A manual - not just for biologists. Stuttgart 2001, ISBN 3-12-031080-8 .
  • Christian Wendel: Basic biological experiments S I. Vol. 1, botany. Cologne 2001, ISBN 978-3-7614-2297-7

Web links