SUMMARY
There are very few studies on cabbage at different fertigation levels in the Marmara Region, where this study was conducted. In this respect, our study has a unique quality. This study was carried out in Bursa Uludag University Yenisehir Ibrahim Orhan College application greenhouses in 2014-2015 years. Five different irrigation treatments (T1: 100% (full irrigation), T2: 75%, T3: 50%, T4: 25%, T5: 0% (non-irrigated)) and two different fertigation treatments (F1.0: 100% (100:100:100 NPK fertigation and F0.5: 50% (50:50:50 NPK) fertigation) were combined together to determine the effects on yield and quality parameters of cabbages. The amount of irrigation water in 2014 and 2015 years varied between 0.0-620.0 mm and 0.0-660 mm, respectively, while evapotranspiration values varied between 150.0-700 mm and 180.0-710 mm, respectively. It was determined that irrigation water and fertigation levels, yield and quality parameters of cabbages were affected significantly. In both application years, the highest yield was obtained from T1F1.0 treatment as 73.2 and 68.4 tons ha-1 respectively, while the lowest yield was obtained from T5F1.0 treatment as 3.0 and 3.0 tons ha-1, respectively. In 2014 and 2015 years the crop response factor values of cabbage were calculated as 1.20-1.19 and 1.23-1.18, respectively. T2F1.0 and T2F0.5 treatments can be recommended as the most effective irrigation and fertilization levels of cabbage.