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Field bean bioassay
The additional, more sensitive, plant response test method has been developed by WRAP, using field bean (Vicia faba cv Fuego).
WRAP recommends that a new plant response test is used for all composts that are to be used in growing media mixes. The test has been developed following several years of research and development work with Stockbridge Technology Centre, prompted by reports from other countries of herbicide contamination in composts.
Whilst the current BSI PAS 100 plant response test, which uses the tomato plant, remains suitable for screening composts for use in agriculture and field horticulture, the evidence suggests that it is not sufficiently sensitive to detect herbicide concentrations of interest to the growing media sector.
The new test uses field bean plants which reliably detect herbicide contamination at the low levels that can have an impact on some plants in growing media. This gives confidence to growing media manufacturers and composters that their products will not harm customersâ plants. The methodology for the new test, which has been added as an Annex to the current OFW004-006 âÂÂPlant response and weeds test for composted materialâ can be downloaded from HERE.
Please note that composters on the Scheme are not required to test compost samples for the annex i.e. the annex is not mandatory.
For the time being, given that this test is not mandatory, REAL has decided not to take responsibility for appointing the labs to carry this test method.
If you have any questions please contact Justyna at justyna@qualitycompost.org.uk
The additional, more sensitive, plant response test method has been developed by WRAP, using field bean (Vicia faba cv Fuego).
WRAP recommends that a new plant response test is used for all composts that are to be used in growing media mixes. The test has been developed following several years of research and development work with Stockbridge Technology Centre, prompted by reports from other countries of herbicide contamination in composts.
Whilst the current BSI PAS 100 plant response test, which uses the tomato plant, remains suitable for screening composts for use in agriculture and field horticulture, the evidence suggests that it is not sufficiently sensitive to detect herbicide concentrations of interest to the growing media sector.
The new test uses field bean plants which reliably detect herbicide contamination at the low levels that can have an impact on some plants in growing media. This gives confidence to growing media manufacturers and composters that their products will not harm customersâ plants. The methodology for the new test, which has been added as an Annex to the current OFW004-006 âÂÂPlant response and weeds test for composted materialâ can be downloaded from HERE.
Please note that composters on the Scheme are not required to test compost samples for the annex i.e. the annex is not mandatory.
For the time being, given that this test is not mandatory, REAL has decided not to take responsibility for appointing the labs to carry this test method.
If you have any questions please contact Justyna at justyna@qualitycompost.org.uk
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