Clay soil burning
I have a small piece of land. A small 4 meter x 4 meter part of it is of the best clay soil, perhaps the best in the world for making pottery: hard as a rock when dry and like chewing gum when wet. When dry that soil laughs at my pickaxe and when wet it glues my pickaxe to the soil. Not even grass can grow there. However, I am not interested in pottery industry, but growing my plants there.
I read a lot about clay soils and about composting them. Recently I found an article in an very old magazine here http://chestofbooks.com/gardening-horticulture/Journal-2/How-To-Improve-Stiff-Clay-Soils.html#.UmUDnvnxrZ . At the end of the article, it mentions that there is an explanation on how to burn clay: "For the process of burning clay, see Horticultural vol. ii. p. 442, and vol. iii. p. 184. Ed."
However I cannot find the mentioned article on clay burning. Seems like when clay is burnt it will become a bit more porous and will not aggregate any more. This would facilitate draining and also adding compost to it. However, there should be the cons which perhaps were not taken into consideration 130 years ago: burning the clay would perhaps destroy nutrients? And if I burn clay and then add compost to 'refill' nutrients into the burnt clay? It would be bad if from clay that piece of soil becomes as sandy as the Sahara.
I made research, contacted the owner of the website that hosts the above book, nobody knows about clay burning. It seems clay burning is kind of a subject lost in history. I never found anything on that and there is no explanation on how to do it. As my piece of land is small, I would be willing to try clay burning and adding compost, provided it will not destroy the soil.
All your ideas, suggestions and information on the clay burning subject are welcome.