you can just burn some sticks. Won't take a lot for like 1 tbsp/gal soil. I believe hardwood like oak or mesquite is preferable to soft woods like pine and conifers. You definitely want to use untreated wood... no wolmanized 2x4's, etc.

Make sure the wood ash stays dry until mixing into your soil. In other words, don't build a little fire, put out the coals with h2o and then use the resulting ash. If it becomes wet, soluble minerals in the ash runoff, deposit and become unevenly distributed or lost.

If you use the blood and bone meal and then get some guano/manure tea action going (switching from high N guano to high P guano during flower) for your supplemental feeds you may not have to add any other stuff except maybe mag sulfate a couple times.

That's the way I'm growing my next tomato plant. :thumbsup: