Regional model for nitrogen fertilization of site - specific rainfed corn in haplustolls of the central Pampas, Argentina

In semi-arid regions, soil water and nitrogen [N] are generally limiting factors for corn [Zea mays L.] production; hence, implementation of appropriate N fertilization strategies is needed. The use of precision agriculture practices based on specific site and crop properties may contribute to a bet...

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Detalles Bibliográficos
Otros Autores: Gregoret, María Celeste, Díaz Zorita, Martín, Dardanelli, Julio Luis, Bongiovanni, R. G.
Formato: Artículo
Lenguaje:Inglés
Materias:
NITROGEN
SEMI-ARID REGIONS
SPATIAL STATISTICS
VARIABLE FERTILIZER RATES
AGRICULTURAL MANAGEMENT
AGRICULTURAL PRACTICE
CROP PRODUCTION
ECONOMIC ANALYSIS
FERTILIZER APPLICATION
LIMITING FACTOR
MAIZE
NUMERICAL MODEL
NUTRIENT AVAILABILITY
RAINFED AGRICULTURE
SEMIARID REGION
SOIL WATER
SOWING
STATISTICAL ANALYSIS
WATER CONTENT
ARGENTINA
PAMPAS
ZEA MAYS
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2011Gregoret.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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245 1 0 |a Regional model for nitrogen fertilization of site - specific rainfed corn in haplustolls of the central Pampas, Argentina 
520 |a In semi-arid regions, soil water and nitrogen [N] are generally limiting factors for corn [Zea mays L.] production; hence, implementation of appropriate N fertilization strategies is needed. The use of precision agriculture practices based on specific site and crop properties may contribute to a better allocation of fertilizer among management zones [MZ]. The aim of this study was to develop a model for diagnosis of N availability and recommendation of N fertilizer rates adjusted to MZ for dryland corn crops growing in Haplustolls. The model considered variability between MZ by including site-specific variables [soil available water content at sowing [SAW] and Available Nitrogen [soil available N-NO3 at planting + applied N, Nd]] using spatial statistical analysis. The study was conducted in Córdoba, Argentina in Haplustolls and consisted in four field trials of N fertilizer [range 0-161 kg N ha-1] in each MZ. The MZ were selected based on elevation maps analysis. Grain yields varied between MZ and increased with larger SAW and Nd at sowing. Grain responses to Nd and SAW in any MZ were not different between sites, allowing to fit a regional model whose parameters [Nd, Nd2, SAW, SAW2] contributed significantly [p less than 0.001] to yield prediction. Agronomical and economically optimum N rates varied among MZs. However, the spatial variability of optimum N rates among MZs within sites was not enough to recommend variable N fertilizer rates instead of a uniform rate. Variable N fertilizer rates should be recommended only if variability in SAW and soil N among MZ is greater than that found in this work. 
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653 0 |a SPATIAL STATISTICS 
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653 0 |a RAINFED AGRICULTURE 
653 0 |a SEMIARID REGION 
653 0 |a SOIL WATER 
653 0 |a SOWING 
653 0 |a STATISTICAL ANALYSIS 
653 0 |a WATER CONTENT 
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653 0 |a ZEA MAYS 
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773 |t Precision Agriculture  |g Vol.12, no.6 (2011), p.831-849 
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900 |a ^aDíaz Zorita, M.^tCONICET-FAUBA and Merck Crop Bioscience Argentina, Pilar, Argentina 
900 |a ^aDardanelli, J.^tINTA Manfredi, Córdoba, Argentina 
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900 |a AGRICULTURAL PRACTICE 
900 |a CROP PRODUCTION 
900 |a ECONOMIC ANALYSIS 
900 |a FERTILIZER APPLICATION 
900 |a LIMITING FACTOR 
900 |a MAIZE 
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900 |a NUTRIENT AVAILABILITY 
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900 |a ZEA MAYS 
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