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Biblioteca (s) : |
INIA La Estanzuela; INIA Treinta y Tres. |
Fecha : |
21/02/2014 |
Actualizado : |
02/09/2016 |
Tipo de producción científica : |
Documentos |
Autor : |
DIAZ, R.; GARCÍA, F.; BOZZANO, A. |
Afiliación : |
ROBERTO MIGUEL DIAZ ROSSELLO; FERNANDO GARCÍA; ASTUR BOZZANO. |
Título : |
Dinámica de la disponibilidad de nitrógeno y las propiedades físicas del suelo en rotaciones de pasturas y cultivos |
Fecha de publicación : |
1980 |
Fuente / Imprenta : |
ln: "Uruguay. Centro de Investigaciones Agrícolas ""Alberto Boerger"" (CIAAB)". Rotaciones. Montevideo (Uruguay): CIAAB, 1980. |
Páginas : |
p. 1-25 |
Serie : |
(CIAAB Miscelánea; 24) |
Idioma : |
Español |
Thesagro : |
ANALISIS ECONOMICO; CONSERVACION DE SUELOS; EXPERIMENTACION; FIJACION DEL NITROGENO; MANEJO DEL SUELO; MATERIA ORGANICA DEL SUELO; PROPIEDADES FISICO-QUIMICAS SUELO; PROPIEDADES FISICOQUIMICAS SUELO; ROTACION DE CULTIVOS. |
Asunto categoría : |
-- |
URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/5976/1/UY.CIAAB.MISCELANEA.1980.no.24.pdf
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Marc : |
LEADER 00924naa a2200265 a 4500 001 1055508 005 2016-09-02 008 1980 bl uuuu u00u1 u #d 100 1 $aDIAZ, R. 245 $aDinámica de la disponibilidad de nitrógeno y las propiedades físicas del suelo en rotaciones de pasturas y cultivos 260 $c1980 300 $ap. 1-25 490 $a(CIAAB Miscelánea; 24) 650 $aANALISIS ECONOMICO 650 $aCONSERVACION DE SUELOS 650 $aEXPERIMENTACION 650 $aFIJACION DEL NITROGENO 650 $aMANEJO DEL SUELO 650 $aMATERIA ORGANICA DEL SUELO 650 $aPROPIEDADES FISICO-QUIMICAS SUELO 650 $aPROPIEDADES FISICOQUIMICAS SUELO 650 $aROTACION DE CULTIVOS 700 1 $aGARCÍA, F. 700 1 $aBOZZANO, A. 773 $tln: "Uruguay. Centro de Investigaciones Agrícolas ""Alberto Boerger"" (CIAAB)". Rotaciones. Montevideo (Uruguay): CIAAB, 1980.
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Registro original : |
INIA Treinta y Tres (TT) |
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Biblioteca (s) : |
INIA Tacuarembó. |
Fecha actual : |
29/04/2015 |
Actualizado : |
16/09/2016 |
Tipo de producción científica : |
Trabajos en Congresos/Conferencias |
Autor : |
DO CARMO, M.; CARDOZO, G.; SOCA, P.M. |
Afiliación : |
MARTIN DO CARMO CORUJO, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; GERONIMO AGUSTIN CARDOZO CABANELAS, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; PABLO M. SOCA. |
Título : |
Measurement of campos rangelands herbage mass by simple methods. [Resumen]. |
Fecha de publicación : |
2015 |
Fuente / Imprenta : |
ANNUAL MEETING OF THE SOCIETY FOR RANGE MANAGEMENT, SRM, 68., Sacramento, USA, 2015. |
Idioma : |
Inglés |
Contenido : |
Accurate and precise estimation of herbage mass is essential for livestock management, because herbage allowance depends on it estimation. Difficulties in estimation arise because of great variability in herbage mass in grassland and rangeland situations. Measuring yield directly by cutting is costly and destructive; but herbage height is highly correlated with herbage mass, thus could be a substitute of the cutting. Based on measurement of herbage mass in a large experiment (EEBR) and in four farms across Uruguay (MICN), we analyzed the relationship between herbage height and dry weight of the quadrat in kg/ha. Analysis was performed
with PROC MIXED and PROC CORR of SAS. On the other hand, the sample size to be taken in each paddock is of great importance and was estimated from the data population described above by resampling and estimating the coefficient of variation (CV) between means. A CV of 10% was defined as the limit to consider the estimation precise enough. The general relationship was y = 224 (±36) + x * 339 (±4), R2 = 0.84. Sample size to maintain the average with a CV error below 10% varied with mean, because it change the variance, however as a general rule, with a sample size between 60 to 100 only one estimation from 198, was above 10% error of the mean. We conclude that estimations based on herbage height are accurate enough (R2 = 0.84) to estimate the herbage mass and a sample size from
60 to 100, give as confidence to estimate herbage mass with precision in paddocks from 5 to 190 ha. That methodology should be extended to Campos rangeland manager for decision making to control grazing intensity. MenosAccurate and precise estimation of herbage mass is essential for livestock management, because herbage allowance depends on it estimation. Difficulties in estimation arise because of great variability in herbage mass in grassland and rangeland situations. Measuring yield directly by cutting is costly and destructive; but herbage height is highly correlated with herbage mass, thus could be a substitute of the cutting. Based on measurement of herbage mass in a large experiment (EEBR) and in four farms across Uruguay (MICN), we analyzed the relationship between herbage height and dry weight of the quadrat in kg/ha. Analysis was performed
with PROC MIXED and PROC CORR of SAS. On the other hand, the sample size to be taken in each paddock is of great importance and was estimated from the data population described above by resampling and estimating the coefficient of variation (CV) between means. A CV of 10% was defined as the limit to consider the estimation precise enough. The general relationship was y = 224 (±36) + x * 339 (±4), R2 = 0.84. Sample size to maintain the average with a CV error below 10% varied with mean, because it change the variance, however as a general rule, with a sample size between 60 to 100 only one estimation from 198, was above 10% error of the mean. We conclude that estimations based on herbage height are accurate enough (R2 = 0.84) to estimate the herbage mass and a sample size from
60 to 100, give as confidence to estimate herbage mass with precisi... Presentar Todo |
Thesagro : |
FORRAJES; PASTURAS. |
Asunto categoría : |
A50 Investigación agraria |
URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/4400/1/DO-CARMO-2015-AINFO.pdf
http://www.rangelands.org/events/
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Marc : |
LEADER 02135nam a2200157 a 4500 001 1052580 005 2016-09-16 008 2015 bl uuuu u01u1 u #d 100 1 $aDO CARMO, M. 245 $aMeasurement of campos rangelands herbage mass by simple methods. [Resumen].$h[electronic resource] 260 $aANNUAL MEETING OF THE SOCIETY FOR RANGE MANAGEMENT, SRM, 68., Sacramento, USA$c2015 520 $aAccurate and precise estimation of herbage mass is essential for livestock management, because herbage allowance depends on it estimation. Difficulties in estimation arise because of great variability in herbage mass in grassland and rangeland situations. Measuring yield directly by cutting is costly and destructive; but herbage height is highly correlated with herbage mass, thus could be a substitute of the cutting. Based on measurement of herbage mass in a large experiment (EEBR) and in four farms across Uruguay (MICN), we analyzed the relationship between herbage height and dry weight of the quadrat in kg/ha. Analysis was performed with PROC MIXED and PROC CORR of SAS. On the other hand, the sample size to be taken in each paddock is of great importance and was estimated from the data population described above by resampling and estimating the coefficient of variation (CV) between means. A CV of 10% was defined as the limit to consider the estimation precise enough. The general relationship was y = 224 (±36) + x * 339 (±4), R2 = 0.84. Sample size to maintain the average with a CV error below 10% varied with mean, because it change the variance, however as a general rule, with a sample size between 60 to 100 only one estimation from 198, was above 10% error of the mean. We conclude that estimations based on herbage height are accurate enough (R2 = 0.84) to estimate the herbage mass and a sample size from 60 to 100, give as confidence to estimate herbage mass with precision in paddocks from 5 to 190 ha. That methodology should be extended to Campos rangeland manager for decision making to control grazing intensity. 650 $aFORRAJES 650 $aPASTURAS 700 1 $aCARDOZO, G. 700 1 $aSOCA, P.M.
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