Little potential of spring wheat genotypes as a strategy to reduce nitrogen leaching in Central Europe
Nitrogen [N] losses negatively impact groundwater quality. Spring wheat genotypes varying in N-fertilizer recovery were studied [by using lysimeters] for their potential to minimize NO3-N leaching during spring and summer, over a three-year period. Additionally, we examined to what extent root growt...
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| Otros Autores: | , , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
| Materias: | |
| Acceso en línea: | http://ri.agro.uba.ar/files/download/articulo/2016herrera.pdf LINK AL EDITOR |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
| Sumario: | Nitrogen [N] losses negatively impact groundwater quality. Spring wheat genotypes varying in N-fertilizer recovery were studied [by using lysimeters] for their potential to minimize NO3-N leaching during spring and summer, over a three-year period. Additionally, we examined to what extent root growth and NO³N leaching explain the well-known difference found between apparent and isotopic N recovery. The genotypes were grown under low [2 g m-²] and high [27 g m-² 9] N fertilizer supply. On average, the apparent and isotopic recoveries of N fertilizer by wheat were 43 per cent and 51 per cent, respectively. The three genotypes varied in fertilizer N recovery but not in NO3-N leaching, which only accounted for 15 per cent of the applied N fertilizer. The differences in N uptake, fertilizer N recovery and root growth among the genotypes were not associated with the leached NO3-N because root growth and N uptake were not well synchronized with NO3-N leaching. Already at stem elongation 70 per cent to 98 per cent of the season-long NO3-N leaching had already taken place. Thus, the ability to minimize in-season NO3-N leaching by using spring wheat genotypes with higher fertilizer N recovery was limited because maximum N leaching occurred in the early crop season. |
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| ISSN: | 2073-4395 |