Does biological nitrogen fixation modify soybean nitrogen dilution curves?
Biological nitrogen fixation (BNF) in soybean [Glycine max (L.) Merr.] represents, on average, 60% of total nitrogen (N) uptake. Nitrogen dilution curves link aboveground crop N concentration (%N) to biomass accumulation (W). It has been reported that BNF is an energy-intensive process that might...
| Autores principales: | , , , |
|---|---|
| Formato: | info:ar-repo/semantics/artículo |
| Lenguaje: | Inglés |
| Publicado: |
2018
|
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12123/2473 https://doi.org/10.1016/j.fcr.2018.04.001 |
| _version_ | 1855034970269024256 |
|---|---|
| author | Santachiara, Gabriel Salvagiotti, Fernando Gerde, José Arnaldo Rotundo, José Luis |
| author_browse | Gerde, José Arnaldo Rotundo, José Luis Salvagiotti, Fernando Santachiara, Gabriel |
| author_facet | Santachiara, Gabriel Salvagiotti, Fernando Gerde, José Arnaldo Rotundo, José Luis |
| author_sort | Santachiara, Gabriel |
| collection | INTA Digital |
| description | Biological nitrogen fixation (BNF) in soybean [Glycine max (L.) Merr.] represents, on average, 60% of total
nitrogen (N) uptake. Nitrogen dilution curves link aboveground crop N concentration (%N) to biomass accumulation
(W). It has been reported that BNF is an energy-intensive process that might reduce biomass production
per unit of captured N (physiological N use efficiency or NUE). This increased energy cost could lead to a more
attenuated N (i.e. less efficient) dilution curve. However, there are no reports comparing N dilution curves for
soybean crops differing in N source. Our objectives were to: (i) evaluate the impact of BNF on soybean N dilution
curves and how it influences NUE, and (ii) establish independent N dilution curves for soil and atmospheric N.
Our working hypothesis is that relying on BNF attenuates the N dilution curve and reduces NUE. The experiment
consisted of a control and a fertilized treatment, 0 and 600 kg N ha−1 respectively, applied to four soybean
genotypes in order to establish two differential BNF situations. While the control and fertilized treatments had
differential N accumulation from BNF, ∼70% and ∼16%, respectively, there were no differences observed in
seed yield (∼5000 kg ha−1), NUE (∼36 kg kg−1) and only slight differences in total N uptake (∼365 kg N ha−1
in fertilized treatment compared to ∼389 kg h−1 in the control treatment). Results suggest that reliance on BNF
for N does not influence substantially the attenuation of the N dilution curve and has no impact on NUE. The N
dilution parameter (“b”) ranged from −0.128 to −0.218 among cultivars and fertilization treatments. The less
negative values (more attenuated curve) corresponded to the fertilized plots likely associated with luxury N
consumption. Interestingly, dilution curves from soil mineral N showed the typical dilution pattern, while N
derived from the atmosphere followed a concentration pattern as the crop developed. This most likely reflects
the continuous N flux from BNF to the plant as opposed to the decreasing soil mineral N supply. Recognizing
these concentration/dilution curves for atmospheric and soil N has three immediate implications. First, the
atmospheric N concentration curve might indicate an upper benchmark for evaluating symbiosis performance
during crop development. Second, the concentration pattern observed for BNF could potentially help to reverse
the observed decline in seed protein concentration in modern soybean cultivars. Third, the N concentration/
dilution curves for the individual N sources could be incorporated into crop models for estimating BNF at
different crop biomass levels during soybean development. |
| format | info:ar-repo/semantics/artículo |
| id | INTA2473 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| record_format | dspace |
| spelling | INTA24732019-01-24T18:36:25Z Does biological nitrogen fixation modify soybean nitrogen dilution curves? Santachiara, Gabriel Salvagiotti, Fernando Gerde, José Arnaldo Rotundo, José Luis Soja Glycine Max Fijación del Nitrógeno Rhizobium Aplicación de Abonos Nitrógeno Absorción de Sustancias Nutritivas Nutrient Uptake Nitrogen Fertilizer Application Nitrogen Fixation Soybeans Mineral Soil Absorption Biological nitrogen fixation (BNF) in soybean [Glycine max (L.) Merr.] represents, on average, 60% of total nitrogen (N) uptake. Nitrogen dilution curves link aboveground crop N concentration (%N) to biomass accumulation (W). It has been reported that BNF is an energy-intensive process that might reduce biomass production per unit of captured N (physiological N use efficiency or NUE). This increased energy cost could lead to a more attenuated N (i.e. less efficient) dilution curve. However, there are no reports comparing N dilution curves for soybean crops differing in N source. Our objectives were to: (i) evaluate the impact of BNF on soybean N dilution curves and how it influences NUE, and (ii) establish independent N dilution curves for soil and atmospheric N. Our working hypothesis is that relying on BNF attenuates the N dilution curve and reduces NUE. The experiment consisted of a control and a fertilized treatment, 0 and 600 kg N ha−1 respectively, applied to four soybean genotypes in order to establish two differential BNF situations. While the control and fertilized treatments had differential N accumulation from BNF, ∼70% and ∼16%, respectively, there were no differences observed in seed yield (∼5000 kg ha−1), NUE (∼36 kg kg−1) and only slight differences in total N uptake (∼365 kg N ha−1 in fertilized treatment compared to ∼389 kg h−1 in the control treatment). Results suggest that reliance on BNF for N does not influence substantially the attenuation of the N dilution curve and has no impact on NUE. The N dilution parameter (“b”) ranged from −0.128 to −0.218 among cultivars and fertilization treatments. The less negative values (more attenuated curve) corresponded to the fertilized plots likely associated with luxury N consumption. Interestingly, dilution curves from soil mineral N showed the typical dilution pattern, while N derived from the atmosphere followed a concentration pattern as the crop developed. This most likely reflects the continuous N flux from BNF to the plant as opposed to the decreasing soil mineral N supply. Recognizing these concentration/dilution curves for atmospheric and soil N has three immediate implications. First, the atmospheric N concentration curve might indicate an upper benchmark for evaluating symbiosis performance during crop development. Second, the concentration pattern observed for BNF could potentially help to reverse the observed decline in seed protein concentration in modern soybean cultivars. Third, the N concentration/ dilution curves for the individual N sources could be incorporated into crop models for estimating BNF at different crop biomass levels during soybean development. Fil: Santachiara, Gabriel. Universidad Nacional de Rosario. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Salvagiotti, Fernando. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Oliveros; Argentina Fil: Gerde, Jose Arnaldo. Universidad Nacional de Rosario. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Rotundo, José Luis. Universidad Nacional de Rosario. Facultad de Ciencias Agrarias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina 2018-05-23T18:30:58Z 2018-05-23T18:30:58Z 2018 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/2473 0378-4290 https://doi.org/10.1016/j.fcr.2018.04.001 eng info:eu-repo/semantics/restrictedAccess application/pdf Field crops research 223 : 171–178. (2018) |
| spellingShingle | Soja Glycine Max Fijación del Nitrógeno Rhizobium Aplicación de Abonos Nitrógeno Absorción de Sustancias Nutritivas Nutrient Uptake Nitrogen Fertilizer Application Nitrogen Fixation Soybeans Mineral Soil Absorption Santachiara, Gabriel Salvagiotti, Fernando Gerde, José Arnaldo Rotundo, José Luis Does biological nitrogen fixation modify soybean nitrogen dilution curves? |
| title | Does biological nitrogen fixation modify soybean nitrogen dilution curves? |
| title_full | Does biological nitrogen fixation modify soybean nitrogen dilution curves? |
| title_fullStr | Does biological nitrogen fixation modify soybean nitrogen dilution curves? |
| title_full_unstemmed | Does biological nitrogen fixation modify soybean nitrogen dilution curves? |
| title_short | Does biological nitrogen fixation modify soybean nitrogen dilution curves? |
| title_sort | does biological nitrogen fixation modify soybean nitrogen dilution curves |
| topic | Soja Glycine Max Fijación del Nitrógeno Rhizobium Aplicación de Abonos Nitrógeno Absorción de Sustancias Nutritivas Nutrient Uptake Nitrogen Fertilizer Application Nitrogen Fixation Soybeans Mineral Soil Absorption |
| url | http://hdl.handle.net/20.500.12123/2473 https://doi.org/10.1016/j.fcr.2018.04.001 |
| work_keys_str_mv | AT santachiaragabriel doesbiologicalnitrogenfixationmodifysoybeannitrogendilutioncurves AT salvagiottifernando doesbiologicalnitrogenfixationmodifysoybeannitrogendilutioncurves AT gerdejosearnaldo doesbiologicalnitrogenfixationmodifysoybeannitrogendilutioncurves AT rotundojoseluis doesbiologicalnitrogenfixationmodifysoybeannitrogendilutioncurves |