Hal, it is not the drakes fault that they don't nest two or more times a year. They seem more than willing to mate and do their part. Sad to think that the hens miss such a great chance to improve their kinds population.
On the farm we had a lot of quail which would nest twice in a good year. Often the second nest was near or in one of our tomato field because I suspect the combination of cover and bugs was prime for them. We had standing orders that if a picker found a nest it was to be left alone. My father would rather lose a few tomatoes than a nest of bob whites.