Help with texturing a large mesh terrian

[hh3000]

Hi,
At the moment I want to texture a 256 by 256 meter terrian, which will be used for the Opensim platform I did split the terrian up into 16 pieces and found the texture less blurry than my other attempts. So I was wonder do I have to split the mesh up into smaller pieces and if so how many? I know this will be a pain so is there a much more simpler way to do this.
Thanks