Compost too potent?

[toxcrusadr]

I agree with that, most compost is in the 0.5% - 2% range on N, P and K. But it's hard to know what NPK levels actually are in your soil after adding it (and having your plants subtract it) over time. N goes up and down seasonally and is lost to leaching and atmospheric release as well as to plants...and K and micronutrients (Fe, Mn etc.) are subject to leaching...P is the only one that hangs around much because it sticks to the soil better.

Also, .5-.5-.5 sounds so low, but on the other hand, we add wheelbarrows of the stuff, so the total amount in pounds does add up.