Three years of research were conducted (1983-1985) at Stoneville, MS, on a Dundee very fine sandy loam (Aeric ochraqualf) to evaluate urea, urea-ammonium nitrate (UAN) solution (32%), sulfur-coated urea, ammonium sulfate, ammonium nitrate and calcium nitrate for use in cotton production. The nitrogen materials were applied preplant incorporated (100 lbs N/A) or as a split application of preplant (50 lbs N/A) and sidedress (50 lbs N/A) with the sidedress application made at early squaring. Evaluations were also made of some of the materials as sidedress sources alone by holding the preplant source (UAN solution) constant. Seed cotton and lint yields were lower for some sources in both 1983 and 1984 when compared to urea preplant. After three years, there was no difference between urea and UAN solution when these materials were applied preplant. When the split applications were made, there was no significant difference in the nitrogen sources and no advantage to the split applications. Preplant nitrogen applications are preferred for cotton production on this soil and similar soils with the results from these studies showing no advantage to the split applications. In general, the yields were reduced where the applications were split with the exception of ammonium nitrate. From these results and others reported in the literature for the sandy loams and silt loams of the Mississippi Delta, nitrogen applications should be made prior to planting using the most cost effective source.