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Registro completo
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Biblioteca (s) : |
INIA Treinta y Tres. |
Fecha : |
11/06/2020 |
Actualizado : |
22/02/2021 |
Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
Autor : |
DO CARMO, M.; CARDOZO, G.; MECATTI, F.; SOCA, P.; HIRATA, M. |
Afiliación : |
MARTÍN DO CARMO, Departamento de Sistemas Agrarios y Paisajes Culturales, Centro Universitario de la Región Este, Rocha, Uruguay.; GERONIMO AGUSTIN CARDOZO CABANELAS, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; FULVIA MECATTI, Department of Statistics, Università degli Studi di Milano-Bicocca.; PABLO SOCA, Universidad de la República, School of Agronomy, EEMAC.; MASAHIKO HIRATA, Department of Animal and Grassland Sciences, University of Miyazaki. |
Título : |
Number of samples for accurate visual estimation of mean herbage mass in Campos grasslands. |
Fecha de publicación : |
2020 |
Fuente / Imprenta : |
Agronomy Journal, July 2020, Vol. 112(4), p. 2734-2740. Doi: https://doi.org/10.1002/agj2.20237 |
DOI : |
DOI: 10.1002/agj2.20237 |
Idioma : |
Inglés |
Notas : |
Article history: Manuscript received: 23 October 2019. Manuscript revised: 23 March 2020. Manuscript accepted: 01 April 2020. Accepted manuscript online: 09 April 2020. Version of Record online: 19 May 2020. Published July 2020. |
Contenido : |
The number of samples is a major issue when estimating the mean herbage mass of grazed paddocks. The aim of this study was to assess the number of samples required for accurate visual estimation of mean herbage mass in relation to the herbage mass heterogeneity and size of paddocks. Data were collected across scales of space and time (273 sampling events) from paddocks on Campos grasslands in Uruguay, using the visual estimation technique. The mean herbage mass of the paddocks ranged from 270 to 6350 kg DM ha−1 with coefficient of variation (CV) of 0.13 to 1.26. Twenty-four events representing four levels of herbage mass heterogeneity (CV = 0.3, 0.5, 0.7 and 1.0) × three levels of paddock size (small, 5?13 ha; medium, 41?67 ha; large, 100?140 ha) were chosen (two replicates per group), and analyzed for the probability that the estimation error exceeded 10% of the mean (10% error probability) using the bootstrap technique. The number of samples required for
controlling the 10% error probability below 0.1 increased gradually from 50 to 150 per paddock as the CV increased from 0.3 to 0.7, then sharply to 350 until the CV increased to 1.0, with no effect of paddock size. Taking account of the distribution of CV (< 0.7 in nearly 80% of the events), we propose a general recommendation to take a minimum of 150 samples per paddock for accurate estimation of mean herbage mass in Campos grasslands irrespective of the size of paddocks. |
Palabras claves : |
ANIMAL PRODUCTION; E-TANIN; ESTIMACION DE BIOMASA; FIELD IMPROVEMENT; LOTUS PEDUNCULATUS; MEJORAMIENTO DE CAMPO; MEJORAMIENTO DE CAMPO NATURAL; PRODUCCIÓN ANIMAL. |
Asunto categoría : |
-- |
Marc : |
LEADER 02569naa a2200289 a 4500 001 1061106 005 2021-02-22 008 2020 bl uuuu u00u1 u #d 024 7 $aDOI: 10.1002/agj2.20237$2DOI 100 1 $aDO CARMO, M. 245 $aNumber of samples for accurate visual estimation of mean herbage mass in Campos grasslands.$h[electronic resource] 260 $c2020 500 $aArticle history: Manuscript received: 23 October 2019. Manuscript revised: 23 March 2020. Manuscript accepted: 01 April 2020. Accepted manuscript online: 09 April 2020. Version of Record online: 19 May 2020. Published July 2020. 520 $aThe number of samples is a major issue when estimating the mean herbage mass of grazed paddocks. The aim of this study was to assess the number of samples required for accurate visual estimation of mean herbage mass in relation to the herbage mass heterogeneity and size of paddocks. Data were collected across scales of space and time (273 sampling events) from paddocks on Campos grasslands in Uruguay, using the visual estimation technique. The mean herbage mass of the paddocks ranged from 270 to 6350 kg DM ha−1 with coefficient of variation (CV) of 0.13 to 1.26. Twenty-four events representing four levels of herbage mass heterogeneity (CV = 0.3, 0.5, 0.7 and 1.0) × three levels of paddock size (small, 5?13 ha; medium, 41?67 ha; large, 100?140 ha) were chosen (two replicates per group), and analyzed for the probability that the estimation error exceeded 10% of the mean (10% error probability) using the bootstrap technique. The number of samples required for controlling the 10% error probability below 0.1 increased gradually from 50 to 150 per paddock as the CV increased from 0.3 to 0.7, then sharply to 350 until the CV increased to 1.0, with no effect of paddock size. Taking account of the distribution of CV (< 0.7 in nearly 80% of the events), we propose a general recommendation to take a minimum of 150 samples per paddock for accurate estimation of mean herbage mass in Campos grasslands irrespective of the size of paddocks. 653 $aANIMAL PRODUCTION 653 $aE-TANIN 653 $aESTIMACION DE BIOMASA 653 $aFIELD IMPROVEMENT 653 $aLOTUS PEDUNCULATUS 653 $aMEJORAMIENTO DE CAMPO 653 $aMEJORAMIENTO DE CAMPO NATURAL 653 $aPRODUCCIÓN ANIMAL 700 1 $aCARDOZO, G. 700 1 $aMECATTI, F. 700 1 $aSOCA, P. 700 1 $aHIRATA, M. 773 $tAgronomy Journal, July 2020, Vol. 112(4), p. 2734-2740. Doi: https://doi.org/10.1002/agj2.20237
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INIA Treinta y Tres (TT) |
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Registro completo
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Biblioteca (s) : |
INIA Las Brujas. |
Fecha actual : |
21/02/2014 |
Actualizado : |
23/01/2019 |
Tipo de producción científica : |
Documentos |
Autor : |
PAZOS, J.; CANESSA, S.; SCATONI, I.; NUÑEZ, S.; FRANCO, J. |
Afiliación : |
JORGE PAZOS; SANTIAGO CANESSA; IRIS SCATONI; SATURNINO NUÑEZ BUA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; JORGE FRANCO. |
Título : |
Control químico de Piojo de San José en manzano. |
Fecha de publicación : |
2001 |
Fuente / Imprenta : |
In: INIA (Instituto Nacional de Investigación Agropecuaria); Universidad de la República (UdelaR)/ Facultad de Agronomía. Resultados experimentales en protección vegetal en frutales. Canelones (UY): INIA, 2001. |
Páginas : |
p. 34-39. |
Serie : |
(INIA Serie Actividades de Difusión; 272) |
ISSN : |
1688-9258 |
Idioma : |
Español |
Notas : |
Investigación financiada por GTZ en el marco del Programa de Producción Integrada de Frutas. |
Thesagro : |
CONTROL DE PLAGAS; CONTROL QUIMICO; MANZANA; PLAGAS. |
Asunto categoría : |
H10 Plagas de las plantas |
URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/12310/1/sad-272-p.34-39.pdf
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Marc : |
LEADER 00912naa a2200253 a 4500 001 1007081 005 2019-01-23 008 2001 bl uuuu u00u1 u #d 022 $a1688-9258 100 1 $aPAZOS, J. 245 $aControl químico de Piojo de San José en manzano. 260 $c2001 300 $ap. 34-39. 490 $a(INIA Serie Actividades de Difusión; 272) 500 $aInvestigación financiada por GTZ en el marco del Programa de Producción Integrada de Frutas. 650 $aCONTROL DE PLAGAS 650 $aCONTROL QUIMICO 650 $aMANZANA 650 $aPLAGAS 700 1 $aCANESSA, S. 700 1 $aSCATONI, I. 700 1 $aNUÑEZ, S. 700 1 $aFRANCO, J. 773 $tIn: INIA (Instituto Nacional de Investigación Agropecuaria); Universidad de la República (UdelaR)/ Facultad de Agronomía. Resultados experimentales en protección vegetal en frutales. Canelones (UY): INIA, 2001.
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