To reduce the calcium defficiency which produces severe apical fruit rot in tomatoe, a reseach was developed in Montería (Colombia, Córdoba State) on a soil classified as Tipyc-üstipssament, ustic humidity regime and máximum temperature of 34°C. The soil pH was 5.5, sandy-loam texture, and a low contení of phosphorus, organic matter, calcium, magnesium and sulphur. A randomized complete block design was utilized, with three replications of 30 m2 to evalúate the calcium effect on yield and some quality parameters.The variety of tomatoe utilized was Milano and the treatments were 1 ton/ha of dolomitic lime, foliar application of calcium nitrate and edafic dolomitic lime, edafic application of 100-200-300-400 kg/ha of calcium nitrate, and a check to calcium application. The lime was applied 15 days before planting, and the edafic calcium nitrate was split at planting, flowering and production. When the fruit had 2 mm diameter and than every week the foliar calcium nitrate was applied. The maximun quality of fruits per plant and less fruit damage was found with the application of 100 kg/ha of calcium nitrate. The maximun yield of good quality, 17000 kg/ha) was found with this treatment; the less, 1050 kg/ha, was obtained in the check. With this calcium nitrate level a Benefit:Cost realationship of 2.44 was found indicating a profit of $1.44 with the investion of $1.00. These results indícate that edafic application of 100 kg/ha of calciun nitrate is a good method to reduce calcium defficiency in tomatoe under the conditions of this research.