scholarly journals Nitrogen fixating ability of mungbean genotypes under different levels of nitrogen application

2016 ◽  
Vol 41 (1) ◽  
pp. 163-171 ◽  
Author(s):  
MA Razzaque ◽  
MM Haque ◽  
MA Karim ◽  
ARM Solaiman
Keyword(s):  
Nitrogen Fixation ◽  
Seed Yield ◽  
Biological Nitrogen Fixation ◽  
Yield Potential ◽  
Nitrogen Application ◽  
Culture Experiment ◽  
N Application ◽  
Biological Nitrogen ◽  
Different Levels ◽  
Pot Culture

A pot culture experiment was conducted at the Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur during kharif II, 2012 to evaluate the nodulation, biological nitrogen fixation and yield potential of genotypes of mungbean under varying levels of N application. There were 10 mungbean genotypes viz. IPSA 12, GK 27, IPSA 3, IPSA 5, ACC12890055, GK 63, ACC12890053, BU mug 4, BARI Mung 6 and Binamoog 5, each genotype treated with six levels of N (0, 20, 40, 60, 80 and 100 kg N ha-1) . Among the genotypes, the IPSA 12 at 40 kg N ha-1 produced the maximum number of nodules (14.54 plant-1) as well as the highest nitrogen fixation (2.684 mmol C2H4). This resulted in the highest seed yield (14.22 g plant-1). The genotype ACC12890053 recorded the lowest nodulation (6 plant-1), nitrogen fixation (1.134) and seed yield (7.33 g plant-1).Bangladesh J. Agril. Res. 41(1): 163-171, March 2016

scholarly journals Assessment of Nitrogen Uptake and Biological Nitrogen Fixation Responses of Soybean to Nitrogen Fertiliser with SPACSYS

2020 ◽  
Vol 12 (15) ◽  
pp. 5921
Author(s):  
Lu Wu ◽  
Thomas H. Misselbrook ◽  
Liping Feng ◽  
Lianhai Wu
Keyword(s):  
Nitrogen Fixation ◽  
Seed Yield ◽  
Biological Nitrogen Fixation ◽  
Management Practices ◽  
Nitrogen Addition ◽  
Application Rate ◽  
Nitrogen Budgets ◽  
Yield Increase ◽  
Biological Nitrogen ◽  
Scenario Testing

Chemical fertiliser nitrogen addition will inhibit biological nitrogen fixation (BNF) for soybean (Glycine max [L.] Merr) growth. The optimal balance of these two nitrogen input sources has been a key issue for sustainable development in Northeast China. We used the data collected from a four-year experiment with varied irrigation and fertiliser treatments from 2007 to 2010 to evaluate the SPACSYS (Soil-Plant-Atmosphere Continuum SYStem) model. The validated model was run to investigate the responses to different management practices in seed yield, BNF, protein yield and soil nitrogen budgets. Scenario testing showed average yield increase of 2.4–5.2% with additional 50–100 kg N/ha application. Irrigation at the reproductive stage improved seed yield in drier years with an increase of 12–33% compared with the rain-fed treatment. BNF was suppressed by fertiliser nitrogen application and drought stress with a decrease of 6–33% and 8–34%, respectively. The average nitrogen budget without fertilization indicated a deficit of 39 kg N/ha. To attain higher seed yield, applying fertiliser at 25–30 and 15–20 kg N/ha before sowing is advised in drier and wetter years, respectively. To achieve a higher seed nitrogen content, an application rate of 55–60 and 45–50 kg N/ha is recommended for drier and wetter years, respectively.

scholarly journals How Do Different Nitrogen Application Levels and Irrigation Practices Impact Biological Nitrogen Fixation and its Distribution in Paddy System?

2021 ◽  
Author(s):  
Yanhui Zhang ◽  
Tianlong Hu ◽  
Hui Wang ◽  
Haiyang Jin ◽  
Qi Liu ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Biological Nitrogen Fixation ◽  
Soil Depth ◽  
Soil Layer ◽  
Nitrogen Application ◽  
High Nitrogen ◽  
Fixed Nitrogen ◽  
Intermittent Irrigation ◽  
Biological Nitrogen ◽  
Labelling System

Abstract Background and aimsBiological nitrogen fixation (BNF) in paddy systems is impacted by nitrogen application levels and irrigation strategies, but the extents to which these factores influence BNF and its distribution in soil and rice were still largely unclear. This study investigates this influence.MethodsAn airtight transparent growth chamber 15N-labelling system were used to investigate how different nitrogen application levels (0, 125, 187.5 and 250 kg N ha-1) and irrigation strategies (flooding irrigation or intermittent irrigation) impact the amount of BNF and its distribution in soil and rice. ResultsNitrogen application at 125 ~ 250 kg N ha-1 reduced the amount of BNF by 81% - 86%. The inhibition effect of nitrogen application on BNF at a soil depth of 1-15 cm was greater than that at 0-1 cm. Relative to the continuous flooding irrigation, intermittent irrigation enhanced rice growth and promoted the transfer of fixed nitrogen from 0-1 cm soil layer to rice, but it did not change the total amount of BNF. ConclusionsThis study indicated that BNF supplied little nitrogen for rice production at the high nitrogen application levels, but the intermittent irrigation could promote utilization of biologically fixed nitrogen.

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