I just attended a farm tour Sunday where the farmer did this very thing! And he did it in one field and not another as a means of comparison. He stated there was no comparison as the treated field was scads more productive and healthy! However, his method seemed a bit different than what was stated here. He'd bury the manure filled horn all winter but in the spring, retrieve it, mix the contents with water and apply it to the fields at a rate of one tablespoon per acre.