[R] Seeking help with trellis: log scales on xyplot

[hobie perry]

Good afternoon.

The basic plot function can automatically generate log scales as follows:

     plot(calcium ~ soil_ph, log="y")

Here is my basic model in xyplot...

     xyplot(calcium+magnesium ~ soil_ph|depth*region)

I would like the calcium and magnesium values to be reported on a log scale.
I have tried manipulating "scales" and "yscale.components" to no effect. 

Many thanks for your kind assistance,
Hobie Perry
US Forest Service
St. Paul, MN
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