Dave:
I agree.... trial and error. The fowl are enjoyed by us as we water bike around the lake and they follow or by observation from our house and backyard. If I can control their #'s there may be a strong benefit for their organic fertilization. But I really think the #'s per area should not exceed 4 or 5 birds. Time will tell but it seems an easy way to help fertilize our northern ponds but few people try this method it seems. Another side benefit is they are controlling my weed growth in the water as they circle the lake eating continuously. Has anyone else enjoyed this method for northern ponds????
Rowly