Effects of pgpr usage on yield and quality of different head lettuce (Lactuca sativa Var. Capitata)

This study was carried out in the greenhouses and application area of Department of Horticulture, Faculty of Agriculture, Van Yil University. The present study consited of two part as open and protected cultivation, and the effects of three varieties of head lettuce and three different PGPR isolates were investigated on the plant growth, yield and quality. In field trial Great, Kıvırcık and Iceberg varieties; In the greenhouse environment, Chianti, Defne and Bombolo varieties were studied. PGPR isolates (Control, FZB42: Bacillus amyloliquefaciens, CC44: Pseudomonas fluorescens and CC37/2: Pantoea agglomerans) were used in both periods. According to the results of the present thesis, it was observed that the variation in had lettuce varieties had a significant effect on the studied traits, while PGPR applications had significant differences on some traits (esperially head weight, head diameter and pH).