I have a lawn that was seeded in sept of 2001. Came in quite nice. The soil is predominalty clay and very hard. I had some areas that were not growing and begining to turn yellow. I went ahead a aerated those areas in middle may and now they are a georgous deep green. My question is this, should I aerated the rest of the lawn as well. The rest of the lawn is growing but has a slight yellow tinge to it, even with proper fertilization. Soil sample test is fine, ph is fine. Again, this is clay soil and it is compacted. Any suggestions?