Mychorrhizal fungi and Terra preta

I am very sure that fungi have something to do with the very strange phenomena of Terra preta soil increase.  The film says that the soil replenishes itself but there is some indication that compost is used to ameliorate the process. 
I have watched the film ( http://topdocumentaryfilms.com/secret-el-dorado/ ) several times now trying to glean all the information I can.
As I have said, this could be mychorrhizal fungi but yeast is another avenue to follow. I don't know where to get sour dough yeast from; however my local garden centre sells mychorrhizal fungi.
As to producing my own charcoal, I think that I am going to experiment with various commercial charcoals first and I am going to mix them with blood fish and bone in a solution of undiluted comfrey liquid to start with.
I have a particularly infertile area of soil on the allotment, (If you want to know why look on my allotment blog under benzo (a) pyrenes). I am going to set up a proper comparison plot with several sections. One with charcoal on its own, one with blood fish and bone on its own, one with comfrey on its own, one with blood fish and bone and comfrey one with comfrey and charcoal and finally one with all. I would like to check out fungi as well; however that might make it complicated :-)).
Trying to think of ways that the soil remakes itself may not be too problematic. The increase in microorganisms within such a fertile soil could cause it, if they are produced in enough numbers. Any nutrient from decomposition seems to be adsorbed by the charcoal and this also gives soil fungi a really good habitat. Together with an increase in the population of roots and leaf litter from above ground you are very likely to get an increase in volume of soil.

Found my previous blogs - or some of them.

Sweet Pea

 Just been out pinching out the growing tip buds of the sweet peas. No more damping off thank heavens. After the second leaf I take out the growing tip to encourage two good buds lower down to grow. You get much better flowers from these side shoots than you get if you let the leader grow on.

I am going to grow cordon sweet peas this year. I do not have enough canes to grow them up although they are probably the best things to use. I am going to set up the rows in a similar way to my runner beans with two rows of canes tied at the top with a horizontal cane to keep them in place. This is attached to a post at each end.With the sweet peas I am going to run strings from the horizontal top cane to the ground (plus a bit to bury). I will put some vertical canes every 3′ on both sides of the row. When I plant the sweet peas I will plant the string under them. I have done this several times and the string never pulls out. In fact it is quite difficult to get the string out at the end of the season because the sweet pea roots have grown around it. It looks better if you keep the string fairly taught.I only use nylon string because ordinary string will rot off.

Last year I grew sweetpeas and they were very good indeed. I watered them every week with a weak comfrey liquid. One of the allotment holders near me said that her dad used to grow championship sweet peas using only comfrey liquid and I can believe her.

It is getting cold again tonight so I will not be watering. I like to keep my seedlings just damp so that I do not get any more damping off.