Q: I read that one of best things to do for your lawn is to add humate, a soil conditioner. Do you know anything about it.

A: Despite many glowing claims from promoters, very little unbiased, university-based research supports the use of humate on a lawn.

see
http://www.extension.org/faq/38428

http://aggie-horticulture.tamu.edu/extension/newsletters/hortupdate/jun02/art4jun.html