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Big garden! And lots of work to can, freeze and preserve all that produce.
How are you watering your gardens...irrigation or sprinkler or Mother Nature?
Clumpy soil can indicate several things...
1) may have been disked when the soil was a little too wet which should have been made better when you tilled. If the clumps weren't broken before rain...they can remain big clods for a long time.
2) May need humus added....if you are tilling in the stubble from corn, beans, etc...and the soil is still clumpy might need to add straw bales. An easy way to do that in a smaller scale garden is to use the straw as mulch down the rows and till it in in the fall. For a garden that size, wheel barrow it in each time you go pick, then wheel barrow out the produce....or tractor. Composting in designated areas within the big garden will give you humus material to spread with the tractor and disk/till in in the fall or spring also.
3) Soil might need gypsum to "soften" the soil. A soil sample will show what other trace minerals might be needed. And will give you specific quantities. You'll have to ask the county extention office to figure the gypsum.
4) NC doesn't have too much clay soil like we have here, but if there is a lot of clay in the soil...a load of sandy loam...in your case...several loads might help next years garden.
