Maintenance and other questions about your lawn or sod can be answered by using the following resources.

Keystone Sod ~ The cornerstone of a beautiful yard
Keystone Sod ~ Loren Soper, Owner
1650 Road East H North  Keystone, Nebraska 69144
click here for a map to our place
The UNL Extension Center has a lot of good information on how to care for your yard through the Backyard Farmer.
There is also some great downloads on Turfgrass on the UNL Agronomy and Horticulture page.