This evening I did a soil application of TKO Phosphite 0-29-26 with a little nitrate nitrogen. Betsy of the RMGVG gave me the TKO a few years ago, but I've not had much of a chance to use it because of the move and problems in the patch the years previous. TKO is high phosphite and potassium. It is easily absorb-able into the plants, strengthens cell walls, increases systemic response and has anti-fungal properties.
I can't figure out if TKO is a good source of phosphorous however. I read different opinions on that. From what I can figure out, phosphites are somewhat different than phosphorous so that is why it has some of its unique attributes, but it doesn't completely replace phosphorous. It sounds like phosphites might be a great way to help a plant that is phosphorous deficient however because it can be absorbed quickly because it doesn't get bound up in the soil like phosphorous does.
I purposefully made sure the TKO was only put on the soil, because I did a foliar application of multi-mineral earlier in the week and the copper in multi-mineral and TKO don't mix nicely.