I had a garden in sandy loam and put a pickup load of manure in it and Okra was up to 8-9 ft, cucumbers all over he place, tomatoes etc. This was years ago but I remember crawling under all the growth to harvest vegetables. I had so much that I was ging produce to all the neighbors. It was really something but I see where you are coming from.I haven't done it but have read that cow manure from the pasture will be full of seeds that will grow in your garden. Most have regretted using it. ( just from what I have read on the interwebs)