Regarding your clay: you can determine exactly how much of your soil is clay by doing a Jar Test. Fill a straight sided jar half full with soil and take a picture of it with a ruler standing up beside so you know how many inches you have. Then fill the jar with water and a few drops of liquid soap. Then cap the jar and shake it like crazy to "dissolve" all the soil into the water. Set the jar down and watch your clock. At 2 minutes take another picture with the ruler beside it. At 2 hours take another picture with the ruler. Then at 2 days take the last picture. From the pictures you should be able to determine the amount of sand (whatever settled out in 2 minutes), silt (whatever settled out in 2 hours), and clay (whatever is left that did not settle in 2 days). If your water over top of the soil is relatively clear after 2 days, you have no clay at all.

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