Shading/Lightning problem

Thats the thing. i cant find anywhere what to u, i hope u guys can helpme

as you can see, the grass of the stadium is correctly rendered, but the rest of it ist not. the grass came with a template so thats why it works, but everything i did from scratch is no shaded well. i compared settings in both materiales (the grass and the resto of the stadium) and its all the same

any thoughts??

thanks in advance.