Effect of irrigation management with saline water on some agronomic and physiological traits of maize hybrid 704

Document Type : Research Paper

Authors

1 MSc student, Shahid Chamran University of Ahvaz

2 Faculty member, Shahid Chamran University of Ahvaz

Abstract

In order to evaluate the effect of three irrigation methods including surface irrigation (I1), daily sprinkler irrigation (I2), post-irrigation sprinkling with fresh water (I3), and different levels of salinity including 2.9 (control), 3.5, 4.1, 4.7 and 5.3 dS.m-1 on agronomic and physiological traits of maize, a field experiment as factorial was carried out based on randomized complete block design with three replications during 2013-2014 in College of Irrigation science, Shahid Chamran University of Ahvaz. To apply salinity, a sprinkler irrigation system was used to establish minimum and maximum salinity levels on two parallel pipelines on both sides of field. Overlapping sprinklers led to establish a linear salinity gradient. Irrigation methods I3 and I2 with 4750 and 4160 kg h-1 had higher and lower amounts of grain yield, respectively. Water salinity significantly decreased stomatal conductance, chlorophyll index, leaf area index, K+ concentration and ratio of potassium to sodium, and higher reductions in these traits was observed in sprinkler irrigation. Daily sprinkler irrigation and surface irrigation showed the higher and lower Na+ concentration, 18.2 and 15.1 mg kg-1, respectively. These findings showed that, the threshold value of salinity for most traits and all irrigation methods was found to be ~4.1 dS.m-1. With the given water resources limataion and saline water resources in Iran, post-irrigation sprinkling with fresh water might be used for irrigating row crops such as maize with a lower yeild loss.

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Main Subjects

References

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Iranian Journal of Field Crop Science
Volume 49, Issue 1
June 2018
Pages 143-154

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History

  • Receive Date: 21 April 2017
  • Revise Date: 23 July 2017
  • Accept Date: 23 July 2017
  • Publish Date: 22 May 2018

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