New Insights into Soybean Biological Nitrogen Fixation
By Ignacio Antonio Ciampitti, F. Salvagiotti. Agronomy Journal, 2018
185 citations recorded by the source corpus.
Soybean biological N₂ fixation (BNF) relationships with fertilizer N and yield response have been comprehensively reviewed in the scientific literature. However, the study of the N-gap between N uptake and N supplied by N₂ fixation, and the partial N balance (fixed N in aboveground biomass – N seeds) needs further investigation. Therefore, the goals of this synthesis–analysis were to (i) quantify seed production per unit of fixed N under different amounts of N derived from the atmosphere (NDFA, %), (ii) study the N-gap and explore limitations of N₂ fixation (kg ha–¹) for satisfying plant N demand, and (iii) calculate a partial N balance for soybean and determine its relationship with the N₂ fixation process. Data was gathered from 1955 through 2016 using studies reporting BNF, seed yield, and plant N uptake (n = 733 data points). The main outcomes of this review were (i) as NDFA increased, seed production per N₂ fixation decreased (from 0.033 to 0.017 Mg yield kg–¹ N from low, 28%, to high, 80%, NDFA); (ii) N-gap increased faster when NDFA values were above 80% and after plant N content was above 370 kg N ha–¹ suggesting that the crop needs additional N for coping yield potential; and (iii) when excluding roots, the partial N balance calculation revealed negative values across all NDFA levels. Future studies should consider a holistic approach to quantify the contribution of BNF in overall N cycling, including N contribution from roots, and to better understand the soil × plant × rhizobia interactions.
Subfields: Plant Science
View Paper: https://www.semanticscholar.org/paper/ab4de34f3debafaffdd6eca8de0c89f699364a74
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Citations in the corpus
- Benchmarking impact of nitrogen inputs on grain yield and environmental performance of producer fields in the western US Corn Belt (2020, background): “This is critical in the case of maize-soybean rotation considering the typical negative N balance during the soybean cycle, as a result of large seed N removal without addition of N fertilizer, as documented by a number of studies (Connor et al., 2011; Santachiara et al., 2017; Ciampitti and Salvagi”