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Biblioteca (s) : |
INIA Las Brujas. |
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Fecha : |
29/01/2020 |
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Actualizado : |
29/01/2020 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Autor : |
SAWCHIK, J.; MALLARINO, A.P. |
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Afiliación : |
JORGE SAWCHIK PINTOS, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; ANTONIO P. MALLARINO, Dep. of Agronomy, Iowa State Univ., Ames, IA, United States. |
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Título : |
Evaluation of zone soil sampling approaches for phosphorus and potassium based on corn and soybean response to fertilization. |
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Fecha de publicación : |
2007 |
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Fuente / Imprenta : |
Agronomy Journal, November 2007, Volume 99, Issue 6, Pages 1564-1578. Doi: 10.2134/agronj2006.0151 |
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ISSN : |
0002-1962 |
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DOI : |
10.2134/agronj2006.0151 |
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Idioma : |
Inglés |
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Notas : |
Article history: Published November, 2007. |
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Contenido : |
ABSTRACT.
Soil sampling approaches have been compared based on soil-test variation. This study evaluated sampling approaches for P and K based on yield response to fertilization. Strip trials were established on four fields for P and three fields for K managed with corn (Zea mays L.) and soybean (Glycine max L. Merr.) rotations and evaluated 3 or 4 yr (27 site-years). Treatments replicated three to four times were fertilizer and no fertilizer application. Soil test results from a dense grid-point sampling (DG) approach (0.08 to 0.27 ha) were used to simulate six approaches: (i) 1.0-ha grid cells (GC), and zones delineated based on (ii) soil series from digitized survey maps (SMZ); (iii) elevation (EZ); (iv) apparent soil electrical conductivity, ECa (ECZ); (v) EZ and ECZ (EECZ); and (vi) EZ, ECZ, and slope (EECSZ). Grain yield monitors, global positioning systems (GPS), and geographical information systems (GIS) were used to describe crop responses. Estimates of soil-test variation were largest for DG, intermediate for GC, and less for other approaches. Crops responded (P ≤ 0.05) to fertilization in 20 site-years. Sampling approaches DG, GC, EZ, EECZ or EECSZ, ECZ, and SMZ identified a differential within-field yield response in 16, 8, 5, 3, 2, and 2 site-years, respectively. Differential yield responses seldom were explained by zone-mean soil-test values. Zone approaches often identified areas with different yield levels but were less effective than DG or GC at describing within-field variation of soil tests and yield response to fertilization. Zone approaches may be more effective in fields with shorter fertilization histories or soils with more contrast in properties.
© American Society of Agronomy. MenosABSTRACT.
Soil sampling approaches have been compared based on soil-test variation. This study evaluated sampling approaches for P and K based on yield response to fertilization. Strip trials were established on four fields for P and three fields for K managed with corn (Zea mays L.) and soybean (Glycine max L. Merr.) rotations and evaluated 3 or 4 yr (27 site-years). Treatments replicated three to four times were fertilizer and no fertilizer application. Soil test results from a dense grid-point sampling (DG) approach (0.08 to 0.27 ha) were used to simulate six approaches: (i) 1.0-ha grid cells (GC), and zones delineated based on (ii) soil series from digitized survey maps (SMZ); (iii) elevation (EZ); (iv) apparent soil electrical conductivity, ECa (ECZ); (v) EZ and ECZ (EECZ); and (vi) EZ, ECZ, and slope (EECSZ). Grain yield monitors, global positioning systems (GPS), and geographical information systems (GIS) were used to describe crop responses. Estimates of soil-test variation were largest for DG, intermediate for GC, and less for other approaches. Crops responded (P ≤ 0.05) to fertilization in 20 site-years. Sampling approaches DG, GC, EZ, EECZ or EECSZ, ECZ, and SMZ identified a differential within-field yield response in 16, 8, 5, 3, 2, and 2 site-years, respectively. Differential yield responses seldom were explained by zone-mean soil-test values. Zone approaches often identified areas with different yield levels but were less effective than DG or GC at descri... Presentar Todo |
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Palabras claves : |
Fertilizers. |
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Thesagro : |
GLYCINE MAX; ZEA MAYS. |
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Asunto categoría : |
F01 Cultivo |
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Marc : |
LEADER 02450naa a2200205 a 4500
001 1060715
005 2020-01-29
008 2007 bl uuuu u00u1 u #d
022 $a0002-1962
024 7 $a10.2134/agronj2006.0151$2DOI
100 1 $aSAWCHIK, J.
245 $aEvaluation of zone soil sampling approaches for phosphorus and potassium based on corn and soybean response to fertilization.$h[electronic resource]
260 $c2007
500 $aArticle history: Published November, 2007.
520 $aABSTRACT. Soil sampling approaches have been compared based on soil-test variation. This study evaluated sampling approaches for P and K based on yield response to fertilization. Strip trials were established on four fields for P and three fields for K managed with corn (Zea mays L.) and soybean (Glycine max L. Merr.) rotations and evaluated 3 or 4 yr (27 site-years). Treatments replicated three to four times were fertilizer and no fertilizer application. Soil test results from a dense grid-point sampling (DG) approach (0.08 to 0.27 ha) were used to simulate six approaches: (i) 1.0-ha grid cells (GC), and zones delineated based on (ii) soil series from digitized survey maps (SMZ); (iii) elevation (EZ); (iv) apparent soil electrical conductivity, ECa (ECZ); (v) EZ and ECZ (EECZ); and (vi) EZ, ECZ, and slope (EECSZ). Grain yield monitors, global positioning systems (GPS), and geographical information systems (GIS) were used to describe crop responses. Estimates of soil-test variation were largest for DG, intermediate for GC, and less for other approaches. Crops responded (P ≤ 0.05) to fertilization in 20 site-years. Sampling approaches DG, GC, EZ, EECZ or EECSZ, ECZ, and SMZ identified a differential within-field yield response in 16, 8, 5, 3, 2, and 2 site-years, respectively. Differential yield responses seldom were explained by zone-mean soil-test values. Zone approaches often identified areas with different yield levels but were less effective than DG or GC at describing within-field variation of soil tests and yield response to fertilization. Zone approaches may be more effective in fields with shorter fertilization histories or soils with more contrast in properties. © American Society of Agronomy.
650 $aGLYCINE MAX
650 $aZEA MAYS
653 $aFertilizers
700 1 $aMALLARINO, A.P.
773 $tAgronomy Journal, November 2007, Volume 99, Issue 6, Pages 1564-1578. Doi: 10.2134/agronj2006.0151
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INIA Las Brujas (LB) |
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Registro completo
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Biblioteca (s) : |
INIA Las Brujas. |
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Fecha actual : |
19/03/2020 |
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Actualizado : |
19/03/2020 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
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Circulación / Nivel : |
Internacional - -- |
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Autor : |
LANFRANCO, B.; AMES, G.C.W.; HUANG, CH.L. |
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Afiliación : |
BRUNO ANTONIO LANFRANCO CRESPO, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; University of Georgia, Department of Agricultural and Applied Economics; GLENN C.W. AMES, University of Georgia, Department of Agricultural and Applied Economics; CHUNG L. HUANG, University of Georgia, Department of Agricultural and Applied Economics. |
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Título : |
Food demand among hispanic households: revisiting Engel's law. |
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Fecha de publicación : |
2000 |
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Fuente / Imprenta : |
Políticas Agrícolas, 2000, Año IV, volume IV, número 3, pp. 69-92. |
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ISSN : |
1405-3187 |
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Idioma : |
Inglés |
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Contenido : |
ABSTRACT.
Income and household size for food were estimated for Hispanic households in the United States. Engel curves for nine main food groups and three meat subgroups were estimated by different econometric methods using a semi-logarithmic model. The results inidcate that the Hispanic demand for food is relatively income inelastic but more responsive to household size. Income transfer programs such as Women, Infants and Children certificates and Food Stamps appeared to be positively associated with milk and fruit consumption relative to non-recipients.
RESUMEN.
En este estudio se estimaron las elasticidades de la demanda de alimentos para hogares hispanos en los Estados Unidos, respecto al ingreso y al tamaño del núcleo familiar. Se construyeron curvas de Engel para nueve grandes grupos de alimentos y tres distintos tipos de carnes, usando un modelo semi-logarítmico, mediante diferentes métodos econométricos. Los resultados obtenidos indican que la demanda de alimentos por parte de los hogares hispanos es relativamente inelástica con respecto al ingreso, mostrando una mayor respuesta a variaciones de tamaño del núcleo familiar. Adicionalmente, se encontraron evidencias de que algunos programas de transferencia de ingreso como Women, Infants and Children y Food Stamps, estarían positivamente asociados a un mayor consumo de lácteos y frutas, comparados con hogares que no reciben estos beneficios. |
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Palabras claves : |
FOOD; HISPANIC HOUSEHOLDS. |
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Asunto categoría : |
Q01 Ciencia y tecnología de los alimentos |
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URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/14316/1/2000-Lanfranco-Ames-Huang-2000-PolAg-IV3-Engel-law.pdf
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Marc : |
LEADER 01951naa a2200181 a 4500
001 1060932
005 2020-03-19
008 2000 bl uuuu u00u1 u #d
022 $a1405-3187
100 1 $aLANFRANCO, B.
245 $aFood demand among hispanic households$brevisiting Engel's law.$h[electronic resource]
260 $c2000
520 $aABSTRACT. Income and household size for food were estimated for Hispanic households in the United States. Engel curves for nine main food groups and three meat subgroups were estimated by different econometric methods using a semi-logarithmic model. The results inidcate that the Hispanic demand for food is relatively income inelastic but more responsive to household size. Income transfer programs such as Women, Infants and Children certificates and Food Stamps appeared to be positively associated with milk and fruit consumption relative to non-recipients. RESUMEN. En este estudio se estimaron las elasticidades de la demanda de alimentos para hogares hispanos en los Estados Unidos, respecto al ingreso y al tamaño del núcleo familiar. Se construyeron curvas de Engel para nueve grandes grupos de alimentos y tres distintos tipos de carnes, usando un modelo semi-logarítmico, mediante diferentes métodos econométricos. Los resultados obtenidos indican que la demanda de alimentos por parte de los hogares hispanos es relativamente inelástica con respecto al ingreso, mostrando una mayor respuesta a variaciones de tamaño del núcleo familiar. Adicionalmente, se encontraron evidencias de que algunos programas de transferencia de ingreso como Women, Infants and Children y Food Stamps, estarían positivamente asociados a un mayor consumo de lácteos y frutas, comparados con hogares que no reciben estos beneficios.
653 $aFOOD
653 $aHISPANIC HOUSEHOLDS
700 1 $aAMES, G.C.W.
700 1 $aHUANG, CH.L.
773 $tPolíticas Agrícolas, 2000, Año IV, volume IV, número 3, pp. 69-92.
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