Differences in contribution of biological nitrogen fixation to yield performance of common bean cultivars as assessed by
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Differences in contribution of biological nitrogen fixation to yield performance of common bean cultivars as assessed by the 15N natural abundance technique Rafael Sanches Pacheco & Robert Michael Boddey & Bruno José Rodrigues Alves & Enderson Petrônio de Brito Ferreira & Rosângela Straliotto & Adelson Paulo Araújo
Received: 10 January 2020 / Accepted: 27 July 2020 # Springer Nature Switzerland AG 2020
Abstract Aims Identification of variability in biological N2 fixation (BNF) contribution among common bean (Phaseolus vulgaris L.) cultivars under field conditions requires a reliable methodology. This study aimed to assess different common bean cultivars for plant growth and grain yield and to quantify the BNF contribution to the crop using the 15N natural abundance technique. Methods Two field experiments were conducted in an Oxisol in Brazil over two consecutive years, with eight common bean cultivars inoculated with rhizobium or fertilized with mineral N. Plants were analysed at midpod filling stage (two weeks after full-flowering) and at
Responsible Editor: Xinhua He. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11104-020-04654-6) contains supplementary material, which is available to authorized users.
grain maturity. BNF was estimated by the 15N natural abundance technique. Results Average grain yields were 1614 or 2942 kg ha−1 in Experiment I, and 3284 or 3919 kg ha−1 in Experiment II, with rhizobium inoculation or mineral N, respectively. The average contributions of N derived from atmosphere were 14 and 26%, and amounts of N2-fixed were 7 and 22 kg N ha−1, in bean plants at mid-pod filling, respectively, in Experiment I and Experiment II. Conclusions The contributions of BNF increase when common bean crop reached its optimum yield potential even though soil N was the most important source for the plants. There is good relationship between δ15N values of grains and shoots, provided cultivars are of similar growth habit. The 15N natural abundance technique allowed identifying cultivars with relatively high BNF capability for commercial crop and breeding purposes.
R. S. Pacheco : A. P. Araújo Department of Soils, Federal Rural University of Rio de Janeiro, BR 465 Km 7, Seropédica, RJ, Brazil
Keywords Phaseolus vulgaris . δ15N . Nitrogen derived from the atmosphere . Soil N-uptake . Grain yield
R. S. Pacheco (*) : R. M. Boddey : B. J. R. Alves Brazilian Agricultural Research Corporation, Embrapa Agrobiology, BR 465 Km 7, Seropédica, RJ, Brazil e-mail: [email protected]
Introduction
E. P. de Brito Ferreira Brazilian Agricultural Research Corporation, Embrapa Rice & Beans, GO 462 Km 12, Santo Antônio de Goiás, GO, Brazil R. Straliotto Brazilian Agricultural Research Corporation, Embrapa Soils, Rua Jardim Botânico 1024, Rio de Janeiro, RJ, Brazil
Common bean (Phaseolus vulgaris L.) is an edible grain legume essential to food security in many countries worldwide (Los et al. 2018). Brazil, one of the world’s largest producers of comm
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