Biological nitrogen fixation in soybean in Argentina: relationships with crop, soil, and meteorological factors
Aims: This study aims to (i) asses the contribution of biological N fixation (%Ndfa) in the soybean production area of Argentina, (ii) build a model for predicting %Ndfa using crop, soil, and meteorological variables, and (iii) estimate %Ndfa at the country level using values obtained in this study. Methods: %Ndfa was assessed in paddocks and experimental plots located in an area 22–39° S and 56–66° W. %Ndfa was determined using the natural 15N abundance method. A complete data set of soil and meteorological variables (n–47) was used to develop a model for predicting %Ndfa. Results: A median value of %Ndfa in aboveground biomass of 60 % (interquartile range 46–71 %) was estimated. Larger %Ndfa values were observed in areas with high crops yields. When seed yield was above 3.7 Mg ha−1, effective rainfall during fallow and mean temperature in the seed-filling period explained %Ndfa. Below 3.7 Mg ha−1, soil phosphorus content, pH, and effective rainfall in the vegetative period explicated %Ndfa. Conclusions: Soybean production systems in Argentina showed larger %Ndfa than reported values in literature that may affect global N balances. Identified soil and meteorological variables may be useful for predicting %Ndfa in future studies, taking into account their spatial variation in the soil-plant system.
| Main Authors: | , , , , , , |
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| Format: | info:ar-repo/semantics/artículo biblioteca |
| Language: | eng |
| Published: |
2015-07
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| Subjects: | Soja, Fijación Biológica del Nitrógeno, Suelo, Condiciones Atmosféricas, Nitrógeno, Soybeans, Biological Nitrogen Fixation, Soil, Meteorological Factors, Nitrogen, Argentina, Factores Meteorológicos, |
| Online Access: | https://link.springer.com/article/10.1007/s11104-015-2459-8 http://hdl.handle.net/20.500.12123/2272 https://doi.org/10.1007/s11104-015-2459-8 |
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