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Effects of different bud loads and irrigations applied at different leaf water potential levels on Kalecik Karası grape variety

The effects of two irrigation practices (RDI-I and RDI-II) and two bud load treatments on the yield and quality of the Kalecik Karası red wine grape variety were studied. The midday leaf water potential thresholds were used for irrigation timing, and those values were set as –10 bars until flowering, –13 bars between the berry set–veraison and the veraison–ripening periods, and –12 bars after harvest for both irrigation treatments. | Turkish Journal of Agriculture and Forestry Turk J Agric For (2015) 39: 887-897 © TÜBİTAK doi:10.3906/tar-1502-39 http://journals.tubitak.gov.tr/agriculture/ Research Article Effects of different bud loads and irrigations applied at different leaf water potential levels on Kalecik Karası grape variety 1, 1 2 Serpil TANGOLAR *, Semih TANGOLAR , Sevilay TOPÇU Department of Horticulture, Faculty of Agriculture, Çukurova University, Adana, Turkey 2 Department of Agricultural Structures and Irrigation, Faculty of Agriculture, Çukurova University, Adana, Turkey 1 Received: 08.02.2015 Accepted/Published Online: 07.06.2015 Printed: 30.11.2015 Abstract: The effects of two irrigation practices (RDI-I and RDI-II) and two bud load treatments on the yield and quality of the Kalecik Karası red wine grape variety were studied. The midday leaf water potential thresholds were used for irrigation timing, and those values were set as –10 bars until flowering, –13 bars between the berry set–veraison and the veraison–ripening periods, and –12 bars after harvest for both irrigation treatments. Water volumes applied in the irrigations of the RDI-I plots were 50% and 75% of the cumulative evaporation from a class A pan between the berry set–veraison and veraison–ripening growth stages, respectively, while those portions for the RDI-II treatment were vice versa. The effects of control (K) and two-fold increased bud loads (2K) based on mean pruning weight on the grape yield and quality were also investigated. Irrigation and higher bud load treatments considerably increased grape yield in both years of the study. The highest and lowest grape yields were obtained in the RDI-II and the nonirrigated treatments, respectively. The increase in grape yield of irrigated vines in relation to nonirrigated ones was 53.3% in the first year and 54.3% in the second year. With doubling the bud load, the achieved increases in grape yield were 37.8% and 45.1% compared to the traditional bud loads