scholarly journals Conservation Agriculture in Zambia: Effects on Selected Soil Properties and Biological Nitrogen Fixation in Soya Beans (Glycine max (L.) Merr)

2014 ◽  
Vol 3 (3) ◽  
pp. 28 ◽  
Author(s):  
Jane Muchabi ◽  
Obed I. Lungu ◽  
Alice M. Mweetwa
Keyword(s):  
Nitrogen Fixation ◽  
Glycine Max ◽  
Soil Respiration ◽  
Soil Properties ◽  
Biological Nitrogen Fixation ◽  
Management Practices ◽  
Conservation Agriculture ◽  
Crop Productivity ◽  
Conventional Tillage ◽  
Biological Nitrogen

<p>Conservation agriculture has been promoted in Zambia as a strategy to mitigate some of the negative effects arising from conventional tillage practices. Conservation agriculture offers several potential benefits on soil properties. However, these benefits and impacts vary across agro ecological regions and management practices. This study investigated changes, over time, associated with the practice of conservation agriculture in selected soil chemical, physical and biological properties, including an assessment of the effects on soil respiration, nodulation and biological nitrogen fixation in soya beans (<em>Glycine max </em>(L.) Merr). Six paired soil samples were collected from conservation agriculture and conventional tillage fields. Fields under conservation agriculture were 4, 7 and 16 years old while those under conventional tillage had been cultivated for over 18 years. Changes in soil properties due to conservation agriculture practice were determined using published laboratory procedures and compared using the paired t-test at 95% confidence level. The results indicated significantly higher soil pH, soil organic carbon, nodulation and biological nitrogen fixation under conservation agriculture than conventional tillage after seven years of practice. The study also showed significantly higher total porosity, soil microbial biomass, soil respiration and lower soil bulk density after sixteen years of practice. Based on these results, the practice of conservation agriculture has potential to improve crop productivity by improving the different aspects of soil fertility, the length of time before this is realized notwithstanding. Further studies that compare several conservation agriculture systems are recommended in other agro-ecological zones of the country to validate these findings.</p>

scholarly journals Biological nitrogen fixation and agronomic features of soybean (Glycine max (L.) Merr.) crop under different doses of inoculant

2018 ◽  
Vol 67 (2) ◽  
pp. 297-302 ◽  
Author(s):  
Alessandro Pedrozo ◽  
Nelson João Girelli de Oliveira ◽  
Odair Alberton
Keyword(s):  
Nitrogen Fixation ◽  
Glycine Max ◽  
Biological Nitrogen Fixation ◽  
Bradyrhizobium Japonicum ◽  
Glycine Max L ◽  
Agronomic Features ◽  
Biological Nitrogen ◽  
Different Doses

La soya es uno de los cultivos más importantes del mundo y presenta una gran versatilidad. Este estudio tiene como objetivo investigar el efecto del inoculante Bradyrhizobium japonicum a 0, 600 y 1200 ml ha-1 en cultivo de soya, con y sin 1 L ha-1 calcio (Ca 41%) + 0,4 L ha-1 boro (B 14 %). Las plantas se cultivaron durante 90 días en macetas de plástico con 3 kg de arena y vermiculita (v / v) tratadas en autoclave a 121°C durante 1 h. El experimento se realizó en un diseño completamente aleatorizado con cinco repeticiones en un invernadero. Se evaluaron los parámetros de rendimiento de soja, tales como, peso seco del brote, raíz y total; altura de la planta, nitrógeno en el brote; número y peso seco de los nódulos; índice de clorofila en las hojas; cantidad de mazorcas por planta (NPPL); número de granos por pod (NGP); y número de granos por planta (NGPL). La adición de Ca + B aumentó significativamente NPPL, NGPL y NGP. El NPPL y NGPL se incrementaron significativamente con 600 mL ha-1 del inoculante. La dosis de 600 ml ha-1 del inoculante combinado con Ca + B estimuló significativamente NPPL, NGPL y NGP. Se concluye que la productividad de la soya se incrementó con la adición de 600 mL ha-1 de inoculante, en combinación con Ca y B.

Improved estimation of biological nitrogen fixation of soybean cultivars (Glycine max L. Merril) using 15N natural abundance technique

2008 ◽  
Vol 45 (2) ◽  
pp. 175-183 ◽  
Author(s):  
P. Houngnandan ◽  
R. G. H. Yemadje ◽  
S. O. Oikeh ◽  
C. F. Djidohokpin ◽  
P. Boeckx ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Glycine Max ◽  
Biological Nitrogen Fixation ◽  
15N Natural Abundance ◽  
Natural Abundance ◽  
Soybean Cultivars ◽  
Glycine Max L ◽  
Biological Nitrogen

13C isotope discrimination correlates with biological nitrogen fixation in soybean (Glycine max (L.) Merrill)

1992 ◽  
Vol 139 (1) ◽  
pp. 145-147 ◽  
Author(s):  
K. S. Kumarasinghe ◽  
C. Kirda ◽  
A. R. A. G. Mohamed ◽  
F. Zapata ◽  
S. K. A. Danso
Keyword(s):  
Nitrogen Fixation ◽  
Glycine Max ◽  
Biological Nitrogen Fixation ◽  
Isotope Discrimination ◽  
13C Isotope ◽  
Glycine Max L ◽  
Biological Nitrogen

scholarly journals Potential Impacts of Changing Precipitation Patterns on Biological Nitrogen Fixation in Soybean (Glycine Max L.) as Mediated by Landscape Position and Tillage

2021 ◽  
Author(s):  
Kathryn Glanville ◽  
G. Philip Robertson
Keyword(s):  
Nitrogen Fixation ◽  
Biological Nitrogen Fixation ◽  
Conventional Tillage ◽  
Landscape Position ◽  
N Transformations ◽  
Legume Crop ◽  
No Till ◽  
Rainfall Patterns ◽  
A Site ◽  
Biological Nitrogen

Abstract PurposeExpected changes in rainfall patterns will affect the timing of N-mineralization and other N transformations, potentially promoting or suppressing biological nitrogen fixation (BNF). We test the hypotheses that BNF is more sensitive to changing rainfall patterns in summit vs. toeslope positions and in till vs. no-till consistent with patterns of soil texture and organic matter.MethodsAt a site in the upper Midwest USA, we measured soybean BNF 15N natural abundance at different landscape positions with and without supplemental rainfall and in till vs. no-till rainfall exclusion shelters to lengthen the dry periods between rainfall events. ResultsSoybean BNF was 41% higher at summit than toeslope positions, consistent with lower soil OM and coarser texture at summits. When precipitation was increased by 20%, BNF decreased at summit positions and was unaffected at toeslope positions. In a separate tillage experiment, with 3-week (but not 2-week) rainfall intervals, %BNF decreased 15% under conventional tillage and increased 14% under no-till. ConclusionsChanging rainfall patterns affected BNF differentially depending on landscape position and tillage in well-drained Alfisols. BNF was greater in summit than in toeslope positions and decreased with added rainfall. BNF under conventional tillage was more sensitive to longer rainfall intervals than was BNF under no-till. Models that incorporate these interactions will be better able to characterize legume crop performance and N use across landscapes and improve global estimates for BNF.

scholarly journals Role of Biological Nitrogen Fixation (BNF) in Sustainable Agriculture: A Review

2021 ◽  
Vol 4 (3) ◽  
Author(s):  
Rittwika Mukherjee ◽  
Supatra Sen
Keyword(s):  
Nitrogen Fixation ◽  
Sustainable Agriculture ◽  
Biological Nitrogen Fixation ◽  
Crop Production ◽  
Food Systems ◽  
Management Practices ◽  
Ghg Emissions ◽  
N Fertilization ◽  
Agricultural System ◽  
Biological Nitrogen

Agriculture has an enormous environmental footprint. One of the best ways to mitigate climate change is to create balanced food systems based on sustainable agriculture. To reduce the chemical dependence scientists are engineering crop plants for N 2 fixation and they are focused on the biological process BNF (Biological Nitrogen Fixation) for the needs of N2 for crop plant soils. N2 fixed by the BNF process reduces the production cost, Green House gas (GHG) emissions, pollution of surface and ground water. Several management practices are there which influence BNF process in agricultural system. They are N- fertilization species genotype and cultivar and seeding ratios. Better management practices can help to improve N2 fixation. This review highlights the agro-economic importance of BNF and shows it as a cost effective, non- polluting way to improve the soil fertility and crop production.

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.

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