Effects on Blossom-End Rot of Tomato Seedling Growing in Calcium Sulphate and Calcium Hydroxide Added Media

In this study, it was aimed to decrease the ratio of blossom-end rot (BER) in fruits, investigate the effect on yield and yield characteristics by increasing the calcium content of tomato plants. The study in which processing tomato cultivar (Lycopersicon esculentum L., Rio Grande) was used as plant material is composed of two steps. In the first step, tomato seedlings were grown by different calcium sources (Ca(OH)2 and CaSO4) and Ca doses (0, 100, 200 ve 300 gCa. m-2). In the second stage, this seedling was planted to the pot and the vegetation experiment was carried out in which the base fertilizer was applied with triple super phosphate, potassium sulphate, calcium ammonium nitrate and calcium nitrate as the top fertilizer. It has been determined that the addition of calcium sulphate in seedling growing stage increases the fruit weight, fruit diameter, fruit length. It was also determined that the number of fruits increased, the formation of fruit was faster after the flowers were opened, and the harvesting period started early and lasted longer. Although the addition of calcium sulphate at a dose of 100 g. m-2 Ca reduced the number of fruits seen in the BER, no fruit was found in the calcium hydroxide applied seedlings and the plant height was found to increase. However, it has been determined that the adverse effect of calcium hydroxide on yield should be considered. If there is calcium deficiency in tomato growing areas; the application of calcium sulphate at a dose of 100 g. m-2 Ca in grown seedlings resulted in a reduced likelihood of the occurrence of BER in fruits