نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه زراعت، دانشکده تولید گیاهی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان
2 گروه زراعت، دانشکده تولید گیاهی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران
3 دانشکده تولید گیاهی، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Background and objectives: Today, due to natural and human factors, many of which are the result of climate change, soil flooding, salinity, and the combination of both stresses occur. Irrigation with high salinity groundwater increases soil salinity and sodium concentration and leads to soil permeability problems. Low soil permeability and poor drainage cause waterlogging stress and decrease in crop production, so this experiment aims to investigate the simultaneous effect of salinity and Flooding stress and their mutual effect on some agricultural traits, yield and yield components of two wheat varieties was done.
Materials and methods: The experiment was carried out in pots at the Gorgan University of Agricultural Sciences and Natural Resources and factorially in the form of a completely random design in the agricultural year 2015-2016. The experimental treatments included different periods of Flooding at four levels (zero, 7, 14, and 21 days), salinity levels at three levels (zero, 100, and 200 mM NaCl), and wheat cultivars (Marvarid and Kohdasht). A total of 24 treatments were cultivated in 6 replications with 10 plants in each pot. In this experiment, traits such as plant height, stem and leaf dry weight, nitrogen percentage, number of spikes per plant, number of seeds per spike, weight of 1000 seeds, seed yield, biological yield and harvest index were measured. The test data were analyzed using SAS software.
Results: The results showed that the effect of salinity stress on stem and leaf dry weight, plant height, yield and yield components, harvest index, and seed protein percentage was significant at the probability level of 1%. With the increase in salinity, the characteristics of stem and leaf dry weight, plant height, grain yield and yield components, harvest index, and seed protein percentage decreased. The effect of Flooding stress was significant only on leaf dry weight and seed protein percentage at the probability level of 1%. The amount of leaf dry weight decreased due to waterlogging stress and this decrease intensified when these two stresses were applied simultaneously. With the increase of salinity stress, the amount of grain yield and biological yield of wheat decreased, and this decrease was less in Kohdasht variety than Marvarid variety. Also, the correlation results showed that the number of seeds in the spike has the highest correlation with the grain yield, which indicates that with the decrease in the number of seeds in the spike, the seed yield also decreases with the same ratio.
Conclusion: In general, based on the results of this experiment, it can be stated that the simultaneous occurrence of Flooding and salinity stress causes much more damage than the occurrence of each salt and Flooding stress alone, and the Kohdasht variety was more resistant to Flooding and saltwater stress than the Marvarid variety.
کلیدواژه‌ها [English]
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