نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی سابق کارشناسی ارشد د دانشگاه شهید چمران اهواز
2 عضو هیئت علمی
3 عضو هیات علمی دانشگاه شهید چمران اهواز
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
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.
کلیدواژهها [English]
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