I want to grow more watermelon than I have space for in my raised beds. But I have plenty of land. Only problem -- it's heavy clay soil. So here's my idea: I have a tractor based post hole digger and a 12 inch auger. What I was figuring is I can put the post hole digger on to the tractor, and then digging a bunch of 12 inch holes in the hard clay soil, about 10 to 14 feet away from one another. Then after I've dug a bunch of these holes in the ground, I figure on getting some bags of WalMart Organic Humus and dumping the organic humus in the holes. Then take a balanced organic fertilizer (probably GardenTone or PlantTone by www.espoma.com ) and fertilizing the top foot of soil in the hole. Then I will plant transplants of watermelon -- specifically, the Crimson Sweet variety. Any reason why this will not work? Do you have any suggestions for improvement, etc? I do not want to till the entire area (which I could do, theoretically, since I have a tiller for the tractor too). This land is not completely level, and tilling a large area will leave it subject to major erosion problems. Thank you in advance.