ÇÖMLEKÇİOĞLU, Nuray Eskişehir Osmangazi Üniversitesi - Ziraat Fakültesi - Bahçe Bitkileri Bölümü, Turkey , ŞİMŞEK, Mehmet Harran Üniversitesi - Ziraat Fakültesi - Tarımsal Yapılar ve Sulama Bölümü, Turkey

Effects of Gibberellic Acid (GA3) Applied on Fruit Set in Processing Tomato Grown at Different Irrigation Levels and under High Temperature Conditions

38690

High-temperature and drought stresses frequently occur in the field simultaneously and usually adversely affect plants growth and development. In this study, irrigation was applied in three-day intervals, at ratios of 133 % (T133), 100 % (T100) and 66 % (T66), as determined from the amount of total irrigation (IW)/total evaporation (CPE) under high temperature conditions. GA3 was applied to flower at 0, 25 and 50 ppm doses. Total amount of irrigation volumes supplied for T133, T100 and T66 were recorded as 1 651, 1 321 and 961 mm, respectively. Fruit set rate (FSR) was determined as 2.86 % under high temperature and low irrigation level (T66) without GA3 application. FSR has increased to 57.36 % ratio by T133 irrigation and 50 ppm GA3 application. Fruit yield, which was recorded as 34.7 tons ha^-1 for treatment of T66- 0 ppm GA3 increased to 113.5 tons ha^-1 in T133- 50 ppm GA3 treatment. Experimental results showed that both GA3 applications and irrigation levels would be compensated with substantially the inhibition of fruit set and decrease in yield caused by high temperature and drought. GA3 application led to significant increase in the yield even at the highest level of irrigation.

270

Tomato (Solanum lycopersicum) , Gibberellic acid , Drought , Fruit set , High , temperature stress

Yuzuncu Yil University Journal Of Agricultural Sciences

279