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I am astounded that caliche dust would be or would be thought to be toxic. I have never seen the abundant limestone dust from quarries or limestone roads suspected of the least harm except as a nuisance. Is it so dry there that you somehow have a high sodium content?

Caliche=sodium nitrate et al--toxic to humans, animals and plants. It took me six months and way more than I can afford to get hair back on my dogs--all 4 get meds daily. The road in question was a dead end with no traffic & less than 75' from my home, plus I am downwind. Exceptional drought here.

Don't know if this will help, but here's info from Arizona Master Gardener Manual
http://ag.arizona.edu/pubs/garden/mg/soils/caliche.html

Here is a link that might be useful: caliche from Arizona Master Gardener Manual

I'll be darned. I see now that half the definitions of "caliche" refer to the calcium carbonate soil zone I knew about and half refer to the sodium nitrate type. I can see how that would be a problem. You could never get sodium nitrate to dry here, even in drought: it would pull the moisture right out of the air to dampen itself (at least at night even in drought).

Are these trucks driving on dirt roads? If so, I'm wondering why the oil company can't be required to pave [oil] the road. Also can you document [with video or still pictures] the daily accumulation of caliche dust? Are other people being adversely affected? If so, combining your efforts to contact health dept, state,county,fed officials might prove effective. Good luck!

gonebananas:
Yes, and pulls the moisture right out of the plants.

borderbarb:
I have contacted everyone but Obama! Dealing with Big Oil, remember? Raping the land & then will move on. In the midst of extreme drought, they take as much water as they want to frack. I haven't given up, but I need a way to protect what's left of what took years to create. No, I have not given them an oil lease on this place & called the law (3x) when they came over my fences--barbed wire and hotwire--anyway. Fortunately, I have 4 security dogs.

I'm not familiar with the problem, but would covering the plants with something like mosquito netting help at all? Then go by and shake them as you're coughing behind your respirator?

Sue