I have read that it has been recommended as a good agricultural practice for minimizing the release of rice herbicides on receiving water canals. But why we need to calculate if DT50 is already discussed?
There are few specific situations where DT90 values are additionally calculated, viz.,
- Repeated use of same chemical
- Possibility of groundwater contamination (shallow water table)
- Aquatic ecosystem etc
The following links may be helpful for comprehensive idea
http://ec.europa.eu/food/plant/pesticides/guidance_documents/docs/wrkdoc11_en.pdf
http://ec.europa.eu/food/fs/sfp/ph_ps/pro/wrkdoc/wrkdoc10_en.pdf
https://books.google.co.in/books?id=8Elz548LAjoC&pg=PA154&lpg=PA154&dq=DT90+value+is+determined+specifically&source=bl&ots=61QZfJiOGp&sig=qi8nULGccS22-HjI_a60Wt68uvs&hl=en&sa=X&ved=0ahUKEwj6yOrY1NDLAhXOTY4KHXqzDD4Q6AEIGzAA#v=onepage&q=DT90%20value%20is%20determined%20specifically&f=false
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It would be nice if you could attach some research papers for reference as well. Thank you in advance.
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