Evaluation of Some Drought Tolerance Criteria in Locally Gynoecious Cucumber (Cucumis Sativus L.)

A field experiment was carried out in an unheated plastic house in the College of Agriculture-University of Anbar/Ramadi – Iraq in the Autumn season 2018 and Spring season 2019, to evaluate some drought tolerance criteria for three locally hybrids of cucumber (H 2 , H 3 , H 4 ) compared with Local hybrid (H 1 ) Certified by Iraqi Ministry of Agriculture under three levels of soil moisture depletion (30%, 50%, 70%) were calculated on the basis of available water. Six criteria were used (Tol, MP, SSI, YSI, YI, GMP) to determine drought tolerance of planted cucumber hybrids. Results showed that the depletion level (30%) gave highest productivity in 2018 and 2019 (3.397, 5.190 Kg plant −1 ) on the respectively, whereas the lowest yield (3.061, 3.857 Kg plant −1 ) on the respectively for 70% depletion level. The hybrids H 1 and H 3 achive highest yield (3.488, 3.260 Kg plant −1 ) on the respectively in 2018, while the highest yield in 2019 was (4.782 and 4.758 Kg plant −1 ) for H 3 and H 1 hybrids on the respectively without significant differences. H 4 hybrid gave the lowest yield in the two seasons with significant difference in comparison to H 3 and H 1 . The results also showed that the locally producted hybrid H 3 distinguished in most drought tolerance criteria compared with registered hybrid (H 1 ) and was considered as a most tolerance to stress, whereas H 1 hybrid the most sensitive to stress