Effect of flooding in the reproductive stage and Methods fertilization on growth and biological nitrogen fixation in soybeans

Subject Areas : Journal of Plant Ecophysiology

mohammad khadempir ¹ , سرالله گالشی ² , افشین سلطانی ³ , فرشید قادری فر ⁴

1 - داانشگاه علوم کشاورزی و منابع طبیعی گرگان
2 - دانشگاه علوم کشاورزی و منابع طبیعی گرگان
3 - دانشگاه علوم کشاورزی و منابع طبیعی گرگان
4 - دانشگاه علوم کشاورزی و منابع طبیعی گرگان

Received: 2014-12-16 Accepted : 2015-03-12 Published : 2016-01-01

Keywords: soybean, Leaf area, stress flooding, nitrogen nutrition, inoculated with bacteria,

Abstract :

To study the effect of waterlogging stress on dry matter accumulation, leaf area, number and nodule diameter nitrogen fixation in soybean (Glycine max (L.) Merr.) cultivar DPX. Experiment was done at the University of Agricultural Sciences and Natural Resources of Gorgan. The experiment was conducted in a completely randomized design in factorial with two factors. Factors included nutritional levels at three levels: (1 - inoculated with bacteria Japonicum bradyrhizobium 2 - non-inoculated plus nitrogen fertilizer (150 kg/ha urea) 3 - non-inoculated without nitrogen fertilizer) . The second factor was flooding stress periods (0, 5, 10 and 15 days). Flooding of soybean plants was in the reproductive growth stage (R2). The results showed duration flooding leaf surface and leaf dry weight were reduced by an average of 55% compared to control and root dry weight and root volume were increased by an average of 10 percent.Inoculation with bacteria form nodules were observed without fertilizer. With increasing duration of flooding stress nodes per plant, nodule diameter and nodule dry weight decreased. The nutritional levels of nitrogen fertilizer plus the non-inoculated into minimal impact from the flooding stress was . and nutritional parameters measured at the surface of the drop was less than control flooding stress have the greatest impact on nutritional levels had non-inoculated without fertilizerThe results indicate that it is desirable if soybean be fed by nitrogen fertilizer losses from the flooding will see fewer And the results showed a significant reduction of saturated nitrogen fixing nodules on soybean is .