kadri, it was probably all that grass... 2 pops' of walli's "ultra high quality" wild grass.
the size of the populations were way to big... it goes way off into the background, where it is'nt even visible in the render.
so i lowered the size of the grass pops, and checked clip to camera.
AA was 7, detail .9, GI details/surfaces turned off supersample off, raytrace object also off.
the render should be done by this noon or afternoon - it was rendering the bottom of the image when i checked on it this morning.