  We used Lemur Toolkit, an open source toolkit designed for Information
Retrieval (IR) research, for our automated indexing and retrieval experiments
on a TREC-like test collection for Turkish. We study and compare three
retrieval models Lemur supports, especially Language modeling approach to IR,
combined with language specific preprocessing techniques. Our experiments show
that all retrieval models benefits from language specific preprocessing in
terms of retrieval quality. Also Language Modeling approach is the best
performing retrieval model when language specific preprocessing applied.
