I do this for a living.. and have been doing it for 7 years now.
I won't say do or don't do it, totally up to the grower and landowner..
What I can tell you is this:
IN MICHIGAN:
If liquid it has to be injected and maintain a 98% coverage (However, I know in the upper peninsula on tree farms, with a special DEQ permit it can be "sprayed" and left)
If what is known as "cake" (a mostly solid product) it can be surface applied, but must be incorporated within 12 hours
We have to maintain a distance from ditches and wells (distance depends on type of bio-solids and type of well/ water source)
Most bio-solids are lime stabilized, which would make for a good lime source.
We, as the bio-solids applicator have to take soil samples, have them analyzed, notify the state DEQ, wait for their approval, then notify the county and township, and wait for their approval.
There are restrictions on growing produce behind bio-solids, root crops 3 years, crops with ground contact 2 years, and the rest 1 year
We can only apply once per "crop" (basically we can apply after a harvest.. no set time between applications.. could be done in spring and fall of same year, or every fall, or every spring.. whatever best suits the grower)
The family farm has been using bio-solids as a supplement to fertilizer for nearly 20 years now, and the only thing that has shown up so far is our phosphorus has gotten high at which point we can no longer take bio-solids until it comes back down. Our soil tests have not shown a rise in heavy metals.
As was said.. we have a lot of regulations, and for good reason no doubt.
And for the record, I don't lobby for people to join into this.. it is strictly upon one's choice, I just try to answer the questions from my standpoint and let the person asking decide. Some growers swear by it, others will have nothing to do with it.
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