Abstract
Backgrounds and aims
Soybean yield depends on total N uptake, N use efficiency, and harvest index. Nitrogen uptake relays on biological fixation (BNF) and soil absorption. Usually, BNF is considered a yield-related process. However, there is limited information on whether maximizing percent BNF (%BNF) is actually required to maximize N uptake and yield.
Methods
Seventy cultivars were evaluated for total N uptake, N use efficiency, and harvest index. Biological N fixation was determined in a subset of cultivars. The harvest index of N derived from atmosphere and from soil was also assessed.
Results
Yield was positively associated with total N uptake. Highest N uptake was not linked to increased %BNF. An inverse relationship between the amount of BNF (kgBNF) and soil N absorption was observed. Harvest index of N derived from BNF was 85%, while it was 77% for N derived from soil.
Conclusions
Highest total N uptake was attained by different combinations of kgBNF and mineral soil N absorption. This showed that maximizing %BNF is not required to maximize yield. High %BNF played a pivotal role in determining neutral soil N balance. This is so even though N derived from BNF was more partitioned to seeds than N derived from soil.
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Acknowledgements
This research was funded by Agencia Nacional de Promoción Científica y Tecnológica, Argentina (PICT2011-1292). Authors want to thank Florencia Buldain for laboratory support.
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Santachiara, G., Borrás, L., Salvagiotti, F. et al. Relative importance of biological nitrogen fixation and mineral uptake in high yielding soybean cultivars. Plant Soil 418, 191–203 (2017). https://doi.org/10.1007/s11104-017-3279-9
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DOI: https://doi.org/10.1007/s11104-017-3279-9