Cress test

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The cress test is a bioindication procedure in which the seeds of garden cress ( Lepidium sativum ) are used. The normally rapid germinability of these seeds can be used to provide orientational information about air pollutants ( immissions ) or contamination of soil or water samples.

If air pollutants are to be detected , for example in the vicinity of an emitter , the cress seeds (for example 100 pieces) are laid out in suitable containers on filter paper and exposed to the outside air, ensuring even irrigation. Air pollutants partially dissolve in the water and may impair germination. After specified periods of time (max. 5 days), the root and shoot lengths are measured (and any non-germinated seeds are counted) and compared with an unpolluted sample. Soil or water samples can be examined in a similar way.

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