Field trials were initiated in 1992 in seven fields in three states to evaluate the effects of foliar applications of Foliar Sure-K on petiole %K, lint yield and fiber quality of cotton. Foliar Sure-K is uniquely formulated with a nitrogen:phosphate:potash ratio of 3:1:2 which closely reflects that of cotton leaves and stems. Treated areas receiving foliar applications of Foliar Sure-K averaged 5.7% more lint per acre than untreated areas. All seven tests resulted in higher yields, while five of six tests resulted in higher %K in the petiole after two applications. Evaluations for fiber quality at one site indicated no significant treatment effect on micronaire and fiber strength and length.