The effects of different irrigation levels and absicic acid applications on yield and morfo-physiology

In this thesis, the effects of four different irrigation regimes (IR125, IR100, IR75 and IR50) and Absisic Acid application (ABA use and control) on some pumological characteristics (TSS, fruit meat hardness, fruit weight, pH, color properties), leaf area, number of stems, number of fruits, yield per plant, plant nutrient analysis in fruits and EcoPhysiological characteristics of strawberries were investigated under long Spanish tunnels. ABA, was applied three times starting from March to May via foliar application, as 20 μmol L-1. From the beginning of the treatment to the end of the experiment, a total of 712, 575, 438 and 301 mm of water were applied to treatments IR125, IR100, IR75 and IR50 respectively. In addition to the increase in the yield of strawberry with increasing amount of irrigation water, the average fruit weight also increased significantly from 16.9 (IR50) to 27.6 g (IR125). ABA applications have also increased by 6% and determined that they have a positive effect on fruit weight. As expected, the amount of Total Soluble Solid (TSS) has increased significantly with reduced irrigation water. ABA application has determined that it has a positive effect on TSS and the value ranged from 7.8 to 8.4%. Even if the effect of irrigation levels and ABA aplication on the fruit hardness is insignificant, it is determined that the increasing irrigation water and ABA has a positive effect on the hardness of the fruit. Furthermore, the pH of the fruit juice decreased with the rise of the irrigation water and no significant effect of ABA were detected on pH. Consequently, the most effective agricultural application with consedering pomological factors IR100 with ABA aplication is quite accepteble. However, it is important to evaluate this judgment economically in order to be offered to the producer. Keywords: Leaf area, Yield, Eco-Physiological measurements, Pomological analyzes, Rubygem.