Fate of the nitrogen from fertilizers in field - grown maize
The nitrogen [N] from fertilizers has different fate, some of which affect the environment or the human health, e. g. nitrates in groundwater. We determined the fate [plant organs, soil organic matter, remaining nitrates and volatilization] of the N applied to field-grown direct drilling maize. An e...
Guardado en:
| Autor principal: | |
|---|---|
| Otros Autores: | , |
| Formato: | Artículo |
| Lenguaje: | Inglés |
| Materias: | |
| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2012RimskiKorsakov.pdf LINK AL EDITOR |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
| Sumario: | The nitrogen [N] from fertilizers has different fate, some of which affect the environment or the human health, e. g. nitrates in groundwater. We determined the fate [plant organs, soil organic matter, remaining nitrates and volatilization] of the N applied to field-grown direct drilling maize. An experiment was carried out in a Typic Argiudoll at Chivilcoy, Argentina [35º02'S, 60º06'W]. Treatments were: control; 70; 140 and 250 kg N ha -1. Microplots were fertilized with urea tagged with 15N [1.5 percent abundance]. Plant biomass and N concentration were determined at flowering and at physiological maturity. Soil organic N [0-30 cm] and nitrates and ammoniacal N concentrations [0-300 cm] at harvest, and ammonia volatilization were determined. 15N was determined in all samples. The crop was the main sink, recovering an average of 56 percent of the N from the fertilizer. Both the soil organic fraction and ammonia volatilization were the second N sink. The N remaining as residual nitrates averaged 8.6 percent and the leached nitrates were only 0.8 percent of the fertilizer applied. Most N leached after maize cropping could be accredited to mineralization of organic N. Organic matter could then be a temporary sink, which reduces N leaching from a single fertilization but releases nitrates the following years. |
|---|---|
| ISSN: | 1385-1314 |