This meeting was held on our farm site in Lakewood. We continued work on our second hugelkulture, and as usual unearthed more rocks and other stuff. The hugelkulture is now a mound of sticks and small logs. We have been sifting manure and coffee grounds into each layer as we build it, to help trap more water. At the next meeting we will add about three more feet of wood, and then top it off with layers of manure, soil, and wood chips.
We discussed ideas for our sign, and other ideas for future land development. And we got fluorescent tape and reflectors put up around our work area, to warn people and to avoid damage to the beds.
I have been researching hugelkultures a little more, and I have found that in a dry climate, large hugelkultures work better than small ones, since there is a balancing act between the core, which holds more water than a flat bed, and the mound surface, which tends to dry out faster that a flat bed. The small mound has too little core and too much surface area. So we will be building our hugelkultures larger then at first planned.
I have also found that bone char is the best way to supplement our soil’s phosphorus levels. Bone meal, phosphate rock, and soft phosphate tends to be unavailable in this pH, and the manure we are getting may be too leached. It is also a very dilute source. I got some advice from a more experienced permaculture gardener. Here is what he said:
(This comes form the Permies forum, which is a good source of information about various permaculture topics. However, I disagree with many of the philosophical and moral opinions voiced.)
“Phosphorus is a tricky element to work with; if the pH is below 6, it gets fixed by iron and aluminum, if it gets above 7.3, it gets fixed by calcium. However, plants and their beneficial fungi can be persistent and un-fix the phosphorus, perhaps with some acidic or basic root exudates and enzymes, depending on what is needed. It’s unlikely that phosphorus is completely absent from soil, all sorts of critters dropping dead and decomposing provide a fairly constant source from above. The big question is the availability, and that’s where things like bone char can help tremendously. A piece of burnt bone, once colonized by mycorrhizal fungi, can be an oasis of phosphorous in an otherwise phosphorus-fixed landscape.”
So, now I just have to find a source of bone char. We could make it ourselves, and we might do that, a little at a time. However, to get things started, I might buy some, if I can find a source without too much shipping costs involved.