My theory is that the microbes would at least accelerate the breakdown of the grass residues, to which the Aminopyralid is bound. This could be tested on a batch of contaminated manure, split in two. Batch one treated with the innoculum, batch two left untreated. The broad bean test then performed at intervals in each batch.
In the interest of scientific rigour the untreated batch would have to be watered with the same quantity of water as the treated batch, just sans innoculum. Both would need to be chlorine free water.
