Willamette Valley, Oregon | Disagree with your statement about never raising soluble Ca with gypsum.
Here's a graph from my dissertation where I applied gypsum at 10 ton/acre in 1 ft wide bands on 10-ft spacing (so 1 ton/ac on a whole field basis) on highbush blueberries with dual drip irrigation lines placed adjacent to the plant crown, or 8" on either side of the crown. The narrow line placement flushed gypsum away from the rootzone, and wide lines concentrated it in the rootzone. This was for Phytophthora control, which requires very high soluble Ca to suppress the zoospores. Soil solution was sampled with mini lysimeters.
Edited by Yeoman 8/28/2014 13:38
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 Gypsum.gif (52KB - 59 downloads)
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?? for Brad at lawfarms (and others) about gypsum
