Shahed University

Effect of Drought Stress and Foliar Nutrition of Iron Nano-Chelate and Fulvic Acid on Grain Yield and Fatty Acids’ Composition in Seed Oil of Two Sesame Cultivars

Majid Amini Dehaghi | Niki Ayobizadeh | Ghanbar Laei | Jafar Masood Sinaki | Shahram Rezvan

Date :  2020/06/21
Publish in :    به زراعي کشاورزي - کشاورزي سابق

Keywords :محلولپاشي نانوکلات اهن و اسيد فولويک تر عملکرد دانه و ترکية اسيدهاي چرب

Abstract :
The effect of drought stress and foliar nutrition of iron nano-chelate and fulvic acid on grain yield and fatty acids composition in seed oil of two sesame cultivars was evaluated during a factorial split-plot experiment, based on randomized complete block design with three replicates in 2017 in the Research Farm Shahed University of Tehran. The experimental factors included drought stress in three levels: full irrigation as control, irrigation up to 50 seed ripping, and flowering, as well as four treatments of foliar nutrition by iron nano-chelate and fulvic acid in Dashtestan and Halil cultivars. Results show that the drought stress has reduced grain yield as well as seed oil content. The highest grain yield has been observed in full irrigation (2303.3 kg/ha) and the co-application of iron nano-chelate and fulvic acid (2246.4 kg/ha), with Halil cultivar having the highest mean of the total number of capsules (81.19), number of seeds per plant (4786.1), 1000-grain weight (3.21 g), grain yield (2172.7 kg/ha), and biological yield (13534.6 kg/ha), compared to Dashtestan. The highest oil and protein yield have been observed in full irrigation and irrigation up to 50 seed ripping. Irrigation cut off at 50 flowering and seed ripping have had the highest oleic and linoleic fatty acids, compared to the control. Nevertheless, the highest palmitic and stearic fatty acids belong to full irrigation treatment (10.86 and 10.73, respectively). Both Halil and Dashtestan cultivars have had the highest unsaturated and saturated fatty acids, respectively. Finally, it has been shown that severe drought stress reduces the grain yield, seed oil content, and unsaturated fatty acids that the co-application of iron nano-chelate and fulvic acid compensate for the negative effects of stress.

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