When I lived in Tennessee I often though of doing something like the pit. One year I dug a hole and lined it with bricks like they do a hand dug well it stayed full of water all winter. With 300 days of rain every year in TN the garden was often covered with 2" of water for 6 months. During cold 15 degree weather the water and soil would freeze 8" deep. Not much snow in TN but plenty of cold and rain. I never tried the pit I did not want to risk loosing my crop in all that water. I can see how the pit will work fine in a geographical location with less rain and well drained soil.jal_ut wrote:
The "PIT", is just that. Dig a pit and put your taters and carrots in it and cover it up with soil. OK to put some leaves over it too to help keep the cold out.
The temperature of the ground a foot underground remains pretty constant all winter. The moisture in the soil keeps the produce from dehydrating. Potatoes and carrots will keep till spring in a pit. You can dig some up anytime you want if weather permits. I have kept cabbage in a pit too. I like to wrap it in paper then put it in the pit. If you have a piece of canvas or carpet that you can put over the veggies before throwing the dirt on, it makes it a bit easier to get some from the pit when you dig it up.
Any root crops keep well in a pit.
I am sorry, but the term "Clamp", near as I have been able to tell describes a pile of potatoes on top of the ground and covered with straw and plastic. Unfortunately such a set up will not keep the potatoes from freezing in climates like I have here. The winters are cold with temps down to minus twenty or lower some years and I have seen it be below zero for three weeks at a time. The frost penetrates when this happens. Water lines are put over 3 feet below grade in this country to prevent freezing.The fancy agricultural term for this is a "clamp".