Determination the Sensitivity of Different Growth Stages of Five Maize Hybrids to Drought Stress

Subject Areas : New Finding in Agriculture

C. Mansourifar ¹ , A. Fallah ² , S. H. Hossein Zade ³

1 - Assistant Professor Agronomy, College of Agriculture, Payame Noor University
2 - M.Sc. Student of Agronomy, College of Agriculture, Payame Noor University
3 - Ph.D graduated, Science And Research Branch, Islamic Azad University, Tehran, Iran

Received: 2015-12-23 Accepted : 2015-12-23 Published : 2016-01-21

Keywords: Grain yield, Maize, drought, growth stages,

Abstract :

Drought stress is one of the most important factors limiting maize growth and yield in world; which maize hybrids differently respond to drought stress. Growth stages, also, have different sensitivity to drought stress. In order to examine the effect of drought stress in different growth stage on growth, yield and yield components of five maize hybrids, a study was conducted as a completely randomized design, at 2014. The first factor was drought stress (without stress, stress at 8 leaf, tassel emergence, kernel filling), and the second factor was maize hybrids (singe crosses 704, 500, 524, 400 and 370).The results showed that most reduction due to drought stress on grain yield was in tassel emergence and kernel filling, on thousand grain weight was in kernel filling, on grain number in ear was tassel emergence and on days to physiologic rapping was in 8 leaf.  Furthermore, 704 hybrid had the highest yield, grain number in ear and days to rapping; 400 hybrid also had the highest thousand grain weight. On average, drought stress decreased grain yield by 36.70%. The finding of this research indicated that although drought stress in all growth stages decreased growth and yield and but for prevent economic loss must avoid drought stress; however in limited irrigation resources conditions, with a slight decrease in yield the saved water might be used for other crops.

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