RE: Regarding pH levels and liming (for plots)....
i think it will bring the pH up very very slightly.
but it will release P and K.
a couple years ago a relative of mine was trying to burn off a stump in their front yard (5 acre yard, they live in the country). the fire got out of control and burned a what probably looked like a funnel shaped path of grass when viewed from the air. bottom of funnel being the stump. 2 acres probably burned. anyway, about 6 weeks later springtime was here. the area where the lawn was burned was noticeably greener and thicker than the nonburned portion.