Effect of plant growth promoting bacteria in the development of tulip (Tulipa L.) grown in si̇i̇rt ecological conditions

This study was carried out in Kurtalan-Siirt ecological conditions to show the effects of NPK and various beneficial bacteria strains on the development and flowering of Tulipa 'Van Eijk' cultivar. N:P2O5:K2O commercial fertilizer was applied to the tulip bulbs as an inorganic fertilizer with the calculation of 16:5:15 kg/da in the study, which was carried out in field conditions with 3 replications and 12 plants in each replication according to the randomized plots trial design. As bioorganic fertilizer, bacteria with 1) nitrogen fixing + phosphate dissolving + ACC deaminase production: Pseudoalteromonas tetraodonis (TV126C), 2) bacteria with nitrogen fixing + phosphate dissolving + ACC deaminase production + siderophore production: Paenibacillus xylanilyticus (KF63C), 3) Bacillus megaterium (TV61C) bacteria with phosphate dissolving + ACC deaminase production feature were used alone and together with NPK. In the study where phenological observations and morphological measurements were made, first leaf emergence and first flowering times, number of leaves, leaf length, leaf width, plant height, flower height and width and stem thickness were examined in tulips. The high average values obtained at the end of the study, 47.12 days at first leaf emergence (control), 96.13 days at first flowering time (TV126C + NPK), (96.13 days), 3.30 leaf count (TV61C), leaf length 85.09 mm (TV61C + NPK), leaf width 40.48 mm (NPK), plant height 263.95 mm (TV61C + NPK), flower height 65.37 mm (TV61C + NPK), flower width 55.92 mm (TV61C + NPK), stem thickness 5.31 mm (TV61C + NPK) have been obtained. The difference between the applications was found to be statistically significant at the level of 1% in terms of the effects on the first leaf emergence time and the number of leaves. In the study carried out under ecological conditions in Kurtalan district of Siirt province, TV61C + NPK application for tulip cultivation had a more positive effect than other applications in terms of the parameters examined. Keywords: Bioorganic fertilization, flowering, Tulipa L., inorganic fertilization, PGPB