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Registro completo
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Biblioteca (s) : |
INIA La Estanzuela; INIA Treinta y Tres. |
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Fecha : |
05/02/2016 |
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Actualizado : |
26/02/2019 |
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Tipo de producción científica : |
Artículos en Revistas Indexadas Nacionales |
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Autor : |
BERETTA, A.; BASSAHUN, D.; MUSSELLI, R.; TORRES, D. |
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Afiliación : |
ANDRES NICOLAS BERETTA BLANCO, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; DANIEL FERNANDO BASSAHUN RODRIGUEZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; BEATRIZ RAQUEL MUSSELLI NEGRIN, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; DEBORAH LUCIANA TORRES GUERRERO, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay. |
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Título : |
Medición de pH del suelo con papel reactivo. (Soil pH measurement with reactive paper test.) |
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Fecha de publicación : |
2015 |
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Fuente / Imprenta : |
Agrociencia Uruguay, 2015, v. 19, n. 2, p. 68-74. |
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ISSN : |
1510-0839 |
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Idioma : |
Español |
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Notas : |
Historia del artículo: Recibido: 25/6/14 Aceptado: 6/2/15. |
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Contenido : |
RESUMEN.
Los papeles reactivos al pH (tirillas) podrían ser útiles para medir pH del suelo. El objetivo fue evaluar la precisión y exactitud de estas medidas. Se comparó la medición de pH (suelo:agua 1:2,5) en 51 muestras de suelo, por tres métodos: con electrodo (pH_electrodo); con tirilla inmediatamente de ser sumergida en el sobrenadante luego de 20 minutos de reposo (pH_T); y con la misma tirilla luego de dos horas de secada, rehumedecida y lavada (pH_T_RL). Se utilizaron tirillas Millipore®, graduadas por unidad de pH, estimándose los valores intermedios. Se analizó carbono orgánico del suelo (COS) y conductividad eléctrica (CE) en cada muestra. Los valores pH_electrodo fueron tomados como referencia. Las lecturas pH_T y pH_T_RL tuvieron una relación aceptable (R2 de 0,50 y 0,48, respectivamente) con pH_electrodo, aunque subestimaron en promedio 0,44 y 0,21 unidades de pH, respectivamente. Con el contenido de carbono orgánico y pH_T o pH_T_RL, se estimó satisfactoriamente el valor de pH_electrodo y la diferencia promedio fue de -0,02 y 0,24 unidades de pH, respectivamente. Hubo concordancia aceptable al clasificar la acidez del suelo por pH_electrodo, por pH_T_RL o por pH estimado a partir de pH_T y carbono orgánico. Al realizar una calibración entre lecturas de pH con tirillas en función del contenido de COS y las mediciones de pH con electrodo, es posible utilizar las lecturas de pH con tirilla como una medida orientativa para clasificar la acidez del suelo.
.-.-.-.-.-.-.-.-.-.-.-.-.-.
SUMMARY.
The pH test papers (strips) may be useful for measuring soil pH. The pH values for 51 samples were measured. The objective was evaluate the precision and accuracy of these measures. We compared three methods to measure the pH (soil:water 1:2.5): electrode (pH_electrodo); paper test strips either immediately after inmersion (pH_T), or two hours after inmersion (pH_T_RL). Millipore® pH paper strips graduated per unit of pH were used. Electrical conductivity (EC) and soil organic carbon (SOC) were analyzed in each sample. The pH_electrodo values were taken as reference. The pH_T and pH_T_RL values had an acceptable relationship with pH_electrode values, with R2 of 0.50 and 0.48, respectively. These methods, however, underestimated the average pH_electrodo values in 0.44 and 0.21 pH units, respectively. When the value of pH_electrodo was estimated by organic carbon, pH_T or pH_T_RL showed acceptable fits were obtained and the average differences between pH_electrodo and estimated pH_electrodo were -0.02 and 0.24 units, respectively. Therefore, would be no differences when assigning soils to acidity classes if pH were measured by pH_T_RL methods or estimated by pH_T or pH_T_RL and organic carbon. The pH measured by strip can be used as value to classify soil acidity if previously a calibration based on SOC contents and pH measurements by electrode was made. MenosRESUMEN.
Los papeles reactivos al pH (tirillas) podrían ser útiles para medir pH del suelo. El objetivo fue evaluar la precisión y exactitud de estas medidas. Se comparó la medición de pH (suelo:agua 1:2,5) en 51 muestras de suelo, por tres métodos: con electrodo (pH_electrodo); con tirilla inmediatamente de ser sumergida en el sobrenadante luego de 20 minutos de reposo (pH_T); y con la misma tirilla luego de dos horas de secada, rehumedecida y lavada (pH_T_RL). Se utilizaron tirillas Millipore®, graduadas por unidad de pH, estimándose los valores intermedios. Se analizó carbono orgánico del suelo (COS) y conductividad eléctrica (CE) en cada muestra. Los valores pH_electrodo fueron tomados como referencia. Las lecturas pH_T y pH_T_RL tuvieron una relación aceptable (R2 de 0,50 y 0,48, respectivamente) con pH_electrodo, aunque subestimaron en promedio 0,44 y 0,21 unidades de pH, respectivamente. Con el contenido de carbono orgánico y pH_T o pH_T_RL, se estimó satisfactoriamente el valor de pH_electrodo y la diferencia promedio fue de -0,02 y 0,24 unidades de pH, respectivamente. Hubo concordancia aceptable al clasificar la acidez del suelo por pH_electrodo, por pH_T_RL o por pH estimado a partir de pH_T y carbono orgánico. Al realizar una calibración entre lecturas de pH con tirillas en función del contenido de COS y las mediciones de pH con electrodo, es posible utilizar las lecturas de pH con tirilla como una medida orientativa para clasificar la acidez del suelo.
.-.-.-.-... Presentar Todo |
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Palabras claves : |
CARBONO ORGÁNICO DEL SUELO; COLORIMETRÍA; COLORIMETRY; ORGANIC CARBON; POTENCIOMETRÍA; POTENTIOMETRY; TÉCNICAS ANALÍTICAS; VALORACIÓN POTENCIOMÉTRICA. |
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Thesagro : |
PH DEL SUELO. |
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Asunto categoría : |
P33 Química y física del suelo |
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URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/5484/1/Agrociencia2015v19-n2-p.68-74-BERETTA.pdf
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Marc : |
LEADER 03779naa a2200289 a 4500
001 1054173
005 2019-02-26
008 2015 bl uuuu u00u1 u #d
022 $a1510-0839
100 1 $aBERETTA, A.
245 $aMedición de pH del suelo con papel reactivo. (Soil pH measurement with reactive paper test.)
260 $c2015
500 $aHistoria del artículo: Recibido: 25/6/14 Aceptado: 6/2/15.
520 $aRESUMEN. Los papeles reactivos al pH (tirillas) podrían ser útiles para medir pH del suelo. El objetivo fue evaluar la precisión y exactitud de estas medidas. Se comparó la medición de pH (suelo:agua 1:2,5) en 51 muestras de suelo, por tres métodos: con electrodo (pH_electrodo); con tirilla inmediatamente de ser sumergida en el sobrenadante luego de 20 minutos de reposo (pH_T); y con la misma tirilla luego de dos horas de secada, rehumedecida y lavada (pH_T_RL). Se utilizaron tirillas Millipore®, graduadas por unidad de pH, estimándose los valores intermedios. Se analizó carbono orgánico del suelo (COS) y conductividad eléctrica (CE) en cada muestra. Los valores pH_electrodo fueron tomados como referencia. Las lecturas pH_T y pH_T_RL tuvieron una relación aceptable (R2 de 0,50 y 0,48, respectivamente) con pH_electrodo, aunque subestimaron en promedio 0,44 y 0,21 unidades de pH, respectivamente. Con el contenido de carbono orgánico y pH_T o pH_T_RL, se estimó satisfactoriamente el valor de pH_electrodo y la diferencia promedio fue de -0,02 y 0,24 unidades de pH, respectivamente. Hubo concordancia aceptable al clasificar la acidez del suelo por pH_electrodo, por pH_T_RL o por pH estimado a partir de pH_T y carbono orgánico. Al realizar una calibración entre lecturas de pH con tirillas en función del contenido de COS y las mediciones de pH con electrodo, es posible utilizar las lecturas de pH con tirilla como una medida orientativa para clasificar la acidez del suelo. .-.-.-.-.-.-.-.-.-.-.-.-.-. SUMMARY. The pH test papers (strips) may be useful for measuring soil pH. The pH values for 51 samples were measured. The objective was evaluate the precision and accuracy of these measures. We compared three methods to measure the pH (soil:water 1:2.5): electrode (pH_electrodo); paper test strips either immediately after inmersion (pH_T), or two hours after inmersion (pH_T_RL). Millipore® pH paper strips graduated per unit of pH were used. Electrical conductivity (EC) and soil organic carbon (SOC) were analyzed in each sample. The pH_electrodo values were taken as reference. The pH_T and pH_T_RL values had an acceptable relationship with pH_electrode values, with R2 of 0.50 and 0.48, respectively. These methods, however, underestimated the average pH_electrodo values in 0.44 and 0.21 pH units, respectively. When the value of pH_electrodo was estimated by organic carbon, pH_T or pH_T_RL showed acceptable fits were obtained and the average differences between pH_electrodo and estimated pH_electrodo were -0.02 and 0.24 units, respectively. Therefore, would be no differences when assigning soils to acidity classes if pH were measured by pH_T_RL methods or estimated by pH_T or pH_T_RL and organic carbon. The pH measured by strip can be used as value to classify soil acidity if previously a calibration based on SOC contents and pH measurements by electrode was made.
650 $aPH DEL SUELO
653 $aCARBONO ORGÁNICO DEL SUELO
653 $aCOLORIMETRÍA
653 $aCOLORIMETRY
653 $aORGANIC CARBON
653 $aPOTENCIOMETRÍA
653 $aPOTENTIOMETRY
653 $aTÉCNICAS ANALÍTICAS
653 $aVALORACIÓN POTENCIOMÉTRICA
700 1 $aBASSAHUN, D.
700 1 $aMUSSELLI, R.
700 1 $aTORRES, D.
773 $tAgrociencia Uruguay, 2015$gv. 19, n. 2, p. 68-74.
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Registro original : |
INIA La Estanzuela (LE) |
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 | Acceso al texto completo restringido a Biblioteca INIA Las Brujas. Por información adicional contacte bibliolb@inia.org.uy. |
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Registro completo
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Biblioteca (s) : |
INIA Las Brujas. |
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Fecha actual : |
21/02/2014 |
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Actualizado : |
22/03/2021 |
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Tipo de producción científica : |
Tesis |
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Autor : |
CABRERA, D. |
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Afiliación : |
CARLOS DANILO CABRERA BOLOGNA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay. |
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Título : |
Maturation and ripening of "Doyenne du comice" pears. [Thesis Master of Applied Science - M. Appl. Sc.] |
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Fecha de publicación : |
1998 |
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Fuente / Imprenta : |
Palmerston North (New Zealand): Massey University, 1998. |
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Páginas : |
103 p. |
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Idioma : |
Inglés |
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Notas : |
A thesis presented in partial fulfilment of the requirements for the degree of Master of Applied Science in Horticultural Science at Massey University, Palmerston North, New Zealand. |
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Contenido : |
ABSTRACT.
Characterisation of fruit quality attributes before and at harvest, during coolstorage and during ripening was made using standard and new, non-destructive devices during both the 1996 and 1997 seasons. Fruit firmness was linearly related to time when measured either by 'Kiwifirm' or penetrometer before harvest. Destructive techniques, the penetrometer and the texture analyser, were used to measure firmness and compared with non-destructive devices, the Kiwifirm and the softness meter. It is suggested that expressing rates of softening will be much more straightforward using a device such as the Kiwifirm. This device and the softness meter provided firmness data for pears that were too soft to measure by penetrometer. The effects of harvest date (1,11 and 21 March, 1996) and three crop loads on fruit maturity after a period of 6 weeks in coolstorage were investigated. Fruit size increased considerably during the 20 days before harvest, suggesting that periodical harvests need to be made in order to pick optimum size fruit each time. Maturity at harvest influenced the quality of 'Comice' stored at 0°C in air. Fruit from different harvests behaved differently in terms of softening behaviour and colour changes after 6 weeks in coolstorage. Crop load did not affect fruit quality attributes assessed after coolstorage. The characterisation of the nature and degree of within-tree and between tree fruit variability in harvest maturity and final ripening behaviour of 'Doyenne du Comice' pear was assessed by measuring firmness and colour. These attributes were measured non-destructively on fruit from different positions on the trees, and subsequently measured at harvest and during ripening at 20°C after 7 weeks in coolstorage at 0°C in air. Fruit behaved differently in terms of softening behaviour and colour changes depending on their position on the tree. Fruit maturity was delayed when fruit came from shaded areas, fruit from inner locations were greener than fruit from the outside and top positions. Selective picking and the association of harvest and ripening data may be important in making predictions that could reduce variability in fruit quality in the market place. MenosABSTRACT.
Characterisation of fruit quality attributes before and at harvest, during coolstorage and during ripening was made using standard and new, non-destructive devices during both the 1996 and 1997 seasons. Fruit firmness was linearly related to time when measured either by 'Kiwifirm' or penetrometer before harvest. Destructive techniques, the penetrometer and the texture analyser, were used to measure firmness and compared with non-destructive devices, the Kiwifirm and the softness meter. It is suggested that expressing rates of softening will be much more straightforward using a device such as the Kiwifirm. This device and the softness meter provided firmness data for pears that were too soft to measure by penetrometer. The effects of harvest date (1,11 and 21 March, 1996) and three crop loads on fruit maturity after a period of 6 weeks in coolstorage were investigated. Fruit size increased considerably during the 20 days before harvest, suggesting that periodical harvests need to be made in order to pick optimum size fruit each time. Maturity at harvest influenced the quality of 'Comice' stored at 0°C in air. Fruit from different harvests behaved differently in terms of softening behaviour and colour changes after 6 weeks in coolstorage. Crop load did not affect fruit quality attributes assessed after coolstorage. The characterisation of the nature and degree of within-tree and between tree fruit variability in harvest maturity and final ripening behaviour of 'Doyen... Presentar Todo |
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Palabras claves : |
HARVESTING; PEARS; STORAGE; THESIS. |
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Thesagro : |
ALMACENAMIENTO EN FRIO; FISIOLOGIA POSTCOSECHA; MADURAMIENTO; PERA; VARIEDADES. |
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Asunto categoría : |
F01 Cultivo |
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Marc : |
LEADER 03047nam a2200241 a 4500
001 1001478
005 2021-03-22
008 1998 bl uuuu m 00u1 u #d
100 1 $aCABRERA, D.
245 $aMaturation and ripening of "Doyenne du comice" pears. [Thesis Master of Applied Science - M. Appl. Sc.]
260 $aPalmerston North (New Zealand): Massey University$c1998
300 $a103 p.
500 $aA thesis presented in partial fulfilment of the requirements for the degree of Master of Applied Science in Horticultural Science at Massey University, Palmerston North, New Zealand.
520 $aABSTRACT. Characterisation of fruit quality attributes before and at harvest, during coolstorage and during ripening was made using standard and new, non-destructive devices during both the 1996 and 1997 seasons. Fruit firmness was linearly related to time when measured either by 'Kiwifirm' or penetrometer before harvest. Destructive techniques, the penetrometer and the texture analyser, were used to measure firmness and compared with non-destructive devices, the Kiwifirm and the softness meter. It is suggested that expressing rates of softening will be much more straightforward using a device such as the Kiwifirm. This device and the softness meter provided firmness data for pears that were too soft to measure by penetrometer. The effects of harvest date (1,11 and 21 March, 1996) and three crop loads on fruit maturity after a period of 6 weeks in coolstorage were investigated. Fruit size increased considerably during the 20 days before harvest, suggesting that periodical harvests need to be made in order to pick optimum size fruit each time. Maturity at harvest influenced the quality of 'Comice' stored at 0°C in air. Fruit from different harvests behaved differently in terms of softening behaviour and colour changes after 6 weeks in coolstorage. Crop load did not affect fruit quality attributes assessed after coolstorage. The characterisation of the nature and degree of within-tree and between tree fruit variability in harvest maturity and final ripening behaviour of 'Doyenne du Comice' pear was assessed by measuring firmness and colour. These attributes were measured non-destructively on fruit from different positions on the trees, and subsequently measured at harvest and during ripening at 20°C after 7 weeks in coolstorage at 0°C in air. Fruit behaved differently in terms of softening behaviour and colour changes depending on their position on the tree. Fruit maturity was delayed when fruit came from shaded areas, fruit from inner locations were greener than fruit from the outside and top positions. Selective picking and the association of harvest and ripening data may be important in making predictions that could reduce variability in fruit quality in the market place.
650 $aALMACENAMIENTO EN FRIO
650 $aFISIOLOGIA POSTCOSECHA
650 $aMADURAMIENTO
650 $aPERA
650 $aVARIEDADES
653 $aHARVESTING
653 $aPEARS
653 $aSTORAGE
653 $aTHESIS
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