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- Title
Changes in <sup>15</sup>N natural abundance of biologically fixed N<sub>2</sub> in soybean due to shading, rhizobium strain and plant growth stage.
- Authors
Araujo, Karla E. C.; Vergara, Carlos; Guimarães, Ana Paula; Rouws, Janaina R. C.; Jantalia, Claudia P.; Urquiaga, Segundo; Alves, Bruno J. R.; Boddey, Robert M.
- Abstract
Aims: The evaluation of 15N abundance of N derived from biological N2 fixation (BNF) in legume shoots (<italic>‘B</italic><italic>S</italic><italic>’</italic> value) is essential for quantifying BNF inputs to field-grown legumes. The aim of this study was to investigate the impact of shading, development stage of soybean (<italic>Glycine max</italic>) and rhizobium strain on the <italic>‘B</italic><italic>S</italic><italic>’</italic> value.Methods: Soybean plants were grown in pots of autoclaved sand/perlite mixture in the open field. Plants were harvested at weekly intervals from 46 days after planting (DAP) to 75 DAP. All material was analysed for N and 15N abundance. <italic>‘B</italic><italic>S</italic><italic>’</italic> was calculated assuming 50% of seed N was translocated to the shoots.Results: <italic>‘B</italic><italic>S</italic><italic>’</italic> was stable until 60 DAP but subsequently increased for the three strains tested. Nodule efficiency (N2 fixed g DM nodule−1) was greatly increased by shading and was significantly different between <italic>Bradyrhizobium</italic> species. <italic>‘B</italic><italic>S</italic><italic>’</italic> was greatly increased by shading.Conclusion: We recommend that <italic>‘B</italic><italic>S</italic><italic>’</italic> should be evaluated on plants of the same development stage and light intensity as those where BNF is quantified in the field. Different <italic>Bradyrhizobium</italic> strains make a large impact on <italic>‘B</italic><italic>S</italic><italic>’</italic> and may lead to considerable errors in estimation of BNF inputs to plants with high %N derived from BNF.
- Subjects
SOYBEAN farming; RHIZOBIUM; PLANT growth; NITROGEN fixation; BRADYRHIZOBIUM
- Publication
Plant & Soil, 2018, Vol 426, Issue 1/2, p413
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-018-3627-4