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In order to investigate the integrated management of chemical and biological fertilizers under drought stress and its effect on yield and qualtiative characteristics of black cumin (Nigella sativa L.) a split-plot experiment was conducted based on randomized complete block design with 4 replications at Research Field of Kurdistan University during 2016 spring. In this experiment, irrigation levels including non drought stress (irrigation in the amount of 100% water requirement of the plant) and drought stress (irrigation in the amount of 70% water requirement of the plant) combined as the main factor and levels of combined use of chemical and biological fertilizers including application of 100% chemical fertilizers, 80% chemical fertilizer + biologic fertilizer, 60% chemical fertilizer + biologic fertilizer, 40% chemical fertilizer + biologic fertilizer and without any fertilizer were considered as a sub factor. Leaf relative water content, cell membrane stability, membrane lipid peroxidation, proline, carbohydrates and proteins of soluble leaf, leaf chlorophyll, plant height, number of lateral branches and flowering branches, yield and grain yield components, oil and essential oil yield, protein, phosphorus and potassium of grain were measured. The results of analysis of variance showed that different ratios of chemical + biological fertilizers and drought stress had a significant effect on studied traits. Irrigation in the amount of 70% water requirement of the plant reduced the grain yield, biological yield and 1000 grain weight by 27, 21.29, and 7.49 percent, respectively, compared to irrigation in the amount of 100% water requirement of the plant. The highest grain yield and biological yield, 1000 grain weight, potassium and phosphorus elements were obtained 60% chemical fertilizers + biofertilizers consumption. The results showed that combined application of 60% chemical fertilizers + biofertilizers compared to the use of chemical fertilizers alone, increased the grain yield by 7.5 percent. The highest grain protein by 24.85% were obtained irrigation in the amount of 70% water requirement of the plant and 60% chemical fertilizers + biofertilizers consumption. The stress of water deficit caused an increase in the essential oil content although it decreased essential oil and oil yield. The results showed that combined application of chemical fertilizers + biofertilizers compared to the use of chemical fertilizers without biofertilizers, increased the grain and oil yield and essential oil.
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