Özet:

Aims: The purpose of this study was to determine sensitivity of okra against water stress, and also examined plant growth, yield components, water consumption and water use efficiency under water stress conditions. Methods and results: Different water amounts were applied to determine response of okra (Abelmoschus esculentus L. Akköy 41) to water stress in a study conducted in Tokat/Turkey. The irrigation treatments consisted of the applications of 100%, 75% and 50% of depleted water from root zone of okra. The experiment was designed according to randomized block with three replications. Soil moisture along okra growing season was monitored by gravimetric method. Water consumption and fresh fruit production were found 664 mm and 28690 kg/ha, 596 mm and 24691 kg/ha and 506 mm and 20554 kg/ha for I100, I75 and I50 treatments, respectively. Fresh fruit yield and total dry biomass above ground were significantly affected from water stress but fruit numbers and fruit yield per plant, mean fruit weight, dry fruit yield, harvest index, irrigation water use efficiency and water use efficiency were not affected significantly. Conclusions: Okra was found sensitive against water stress for fresh fruit yield with yield response factor of 1.22 while it was found tolerant for dry fruit yield with yield response factor of 0.71. Dry matter ratio of fruit increased from 15.1% for I100 to 18.0% for I50 treatment. It can be concluded from the results that okra under water stress promoted fruit yield against vegetative growth because of its increasing harvest index. Significance and impact of the study: When okra grown under full irrigation conditions it should be marked as fresh to obtain higher profits. When okra exposed to water stress it should be marked after drying to prevent profit lost.

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