Univrsity of Tehran Press Iranian Journal of Field Crop Science 2008-4811 53 2 2022 06 22 Effect of mycorrhiza and superabsorbent application on corn growth traits and yield components under water stress condition Effect of mycorrhiza and superabsorbent application on corn growth traits and yield components under water stress condition 69 79 88204 10.22059/ijfcs.2021.322655.654823 FA Khosro Parvizi Department of Horticulture Crops Research, Faculty member of Hamedan Agricultural and Natural Resources Research and Education Center, AREEO, Hamedan, Iran. 0000-0002-6236-9204 Amin Farnia Department of Agronomy and Plant Breeding, College of Agriculture, Islamic Azad University, Boroujerd Branch, Iran Mohammad Karim Ghaderi Hamadan Agricultural Jihad Organization, Iran. Journal Article 2021 04 27 To investigate the effects of mycorrhizal fungus and superabsorbent on corn growth traits and yield components under water stress conditions, a factorial split plot experiment based on a randomized complete block design was conducted in Hamadan province in 2019. Low irrigation treatments including optimal irrigation (irrigation at -3bar soil water potential), moderate drought stress (irrigation at -7bar soil water potential) and severe drought stress (irrigation at -11bar soil water potential) were the main plots and mycorrhizal and superabsorbent polymer biofertilizer, their combination and control (no mycorrhiza and superabsorbent) were sub plots. . The results showed that plant height, leaf area index, ear length, ear periphery, row number per ear, number of seeds per row, 100 seeds weight, grain and biological yields and harvest index were significantly affected by superabsorbent and mycorrhizal application. By increasing the drought stress intensity, the growth and yield components decreased, but the decrease was significantly lower compared to the mycorrhiza and superabsorbent polymer applications. Mycorrhiza and superabsorbent applications in severe stress condition could increase biological yield by about 12% and 22% as compared to control. Lowest grain yield (4.25 t/ha) was obtained by severe stress without application of bio-fertilizer and superabsorbent. In general, mycorrhiza and superabsorbent applications had no significant effect on growth and biological and grain yields in the absence of stress and normal irrigationcorn; however under water stress conditions, it had significant effects on growth traits and yield, while with increasing stress intensity, this ability increased and with their combined application, these effects intensified. To investigate the effects of mycorrhizal fungus and superabsorbent on corn growth traits and yield components under water stress conditions, a factorial split plot experiment based on a randomized complete block design was conducted in Hamadan province in 2019. Low irrigation treatments including optimal irrigation (irrigation at -3bar soil water potential), moderate drought stress (irrigation at -7bar soil water potential) and severe drought stress (irrigation at -11bar soil water potential) were the main plots and mycorrhizal and superabsorbent polymer biofertilizer, their combination and control (no mycorrhiza and superabsorbent) were sub plots. . The results showed that plant height, leaf area index, ear length, ear periphery, row number per ear, number of seeds per row, 100 seeds weight, grain and biological yields and harvest index were significantly affected by superabsorbent and mycorrhizal application. By increasing the drought stress intensity, the growth and yield components decreased, but the decrease was significantly lower compared to the mycorrhiza and superabsorbent polymer applications. Mycorrhiza and superabsorbent applications in severe stress condition could increase biological yield by about 12% and 22% as compared to control. Lowest grain yield (4.25 t/ha) was obtained by severe stress without application of bio-fertilizer and superabsorbent. In general, mycorrhiza and superabsorbent applications had no significant effect on growth and biological and grain yields in the absence of stress and normal irrigationcorn; however under water stress conditions, it had significant effects on growth traits and yield, while with increasing stress intensity, this ability increased and with their combined application, these effects intensified. https://ijfcs.ut.ac.ir/article_88204_5a7bbdf4f19266db60da16c6d8457937.pdf