Water Potential Measurements in Trees

Wiebe, Herman H.; Brown, Ray W.; Daniel, Thilagavathy; Campbell, Eric C.

doi:10.2307/1295130

Cited by 51 publications

(29 citation statements)

References 14 publications

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“…Boyer attributed such a lack of agreement to the effect of refilling tissues different from the xylem with xylem sap during measurements. Conversely, Wiebe et al (1970) compared the results obtained using an in situ pressure chamber and a laboratory dewpoint TCP, and obtained good agreement between in situ and laboratory results.…”

Section: Comparison Of Psychrometry With Other Methodologiesmentioning

confidence: 85%

Review. Use of psychrometers in field measurements of plant material: accuracy and handling difficulties

Martínez¹,

Cancela²,

García³

et al. 1970

Span. j. agric. res.

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For years, one of the major concerns of agronomists has been the study of how variations in the crop environment can affect proper crop development. A variety of factors must be considered, including factors such as plant genetics, climatic conditions or soil, and factors directly dependent on man such as technology or labour. In the search for sustainable development, all these factors must coexist in perfect harmony in order AbstractThe determination of leaf water potential is useful in the establishment of irrigation guidelines for agricultural crop management practices and requires the use of various methods, among which thermocouple psychrometers (TCP). TCP have been widely used for this purpose. However, the psychrometric technique is complex and difficult to understand and the instrumentation required is difficult to handle. For this reason, a profound knowledge of the different aspects involved in the technique -which have not been clearly explained in the literature-is required. This paper reviews a number of research areas of TCP and focuses on three very specific fields: a) main applications of phsychrometry in field studies; b) determination of the measurement accuracy of psychrometric equipment, accuracy per se and accuracy tested against alternative methods; c) main errors and handling difficulties of TCP in the field. Research in these areas provides an updated overview of TCP as a method for determining water relations in plant material that will contribute criteria to select the most suitable technique according to the type of plant material and the purpose of the research and will highlight the types of instruments, accuracies and errors that have detrimental effects on measurements.Additional key words: hygrometric technique; irrigation; isopiestic technique; pressure chamber; psychrometric technique. ResumenRevisión. Aplicación de la psicrometría en campo a material vegetal: precisión y dificultades de manejo La determinación del potencial hídrico foliar es muy útil en el establecimiento de directrices de riego en las prácti-cas de manejo agrícola de los cultivos, requiriéndose del uso de diferentes métodos como los psicrómetros termopar (TCP). Los TCP han sido ampliamente utilizados. Sin embargo, se trata de una técnica compleja de difícil manejo. Por lo tanto, se requiere un profundo conocimiento de los diferentes aspectos involucrados en la técnica, que no han sido claramente explicados en los diferentes estudios publicados. Este artículo revisa una serie de líneas de investigación de los TCP. Estas áreas de investigación se han centrado en tres campos muy específicos: a) principales actuaciones en campo empleando la psicrometría; b) especificación de la precisión de los equipos, per se y frente a otras metodologías alternativas; c) principales errores y dificultades de manejo en campo de los psicrómetros. La investigación en esta área permitirá aportar una visión actualizada sobre los TCP como método de determinación de relaciones hídricas en material vegetal, aportando criterios de sele...

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Section: Comparison Of Psychrometry With Other Methodologiesmentioning

confidence: 85%

Review. Use of psychrometers in field measurements of plant material: accuracy and handling difficulties

Martínez¹,

Cancela²,

García³

et al. 1970

Span. j. agric. res.

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“…Immediately after irrigation, the value at 180 em had to be omitted because of water in the bottom of the access tube. Soil water potential was determined daily at 8 a.m. between July 7 and August 2 at 30-cm depth increments beginning at 23 cm, with commercially available ceramic-covered thermocouple psychrometers (Wiebe et al 1970) individually calibrated (E. L. FiscusandM. G. Huck, personal communication) for determining water potential at the ambient temperature.…”

Section: Methodsmentioning

confidence: 99%

Water Uptake by Cotton Roots During an Irrigation Cycle

Taylor¹,

Klepper²

1971

Aust. Jnl. Of Bio. Sci.

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“…As in the case of glasshouse nutrition studies, caution must be exercised in extrapolating growth chamber results to predict plant water potentials under field conditions. It should also be noted that potentials measured on crop plants in the field with the pressure bomb may be higher than potentials measured with the psychrometer or freezing point methods (3,22). The pressure bomb tends to measure pressure potentials in the conductive tissue, while the psychrometer and freezing point meter tend to measure total potentials in and around the cellular tissue.…”

Section: Methodsmentioning

confidence: 99%

Response of Plant Water Potential to the Irrigated Environment of Southern Idaho¹

Cary¹,

Wright²

1971

Agronomy Journal

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Laboratory studies have shown that plant water potential affects a number of key processes involved in growth, but there has been almost no information on what levels of water potential occur under irrigated conditions in the field. Before assessing the practical implication of laboratory results on soil and crop management, this type of information must be available. Consequently, plant water potential in irrigated crops of Zea mays, Triticum aestivum, Hordeum vulgaris, PhaseoIns vulgaris, Pisum sativum, Solanum tuberosum, Beta vulgaris, and Medicago sativa, L. was measured throughout the growing season in southern Idaho. Soil moisture conditions and potential evapotranspiration were monitored. Daily changes in plant water potential varied from Iess than 5 bars to more than 20 bars, while random sampling of supposedly homogeneous sets of plants showed an average variation of about 2 bars. Changes due to differences in soil moisture were also detected, even though the soil moisture potential was kept high enough for near-optimum crop production. Though the crops differed widely in their response to changes in environment, the plant water potential was strongly affected by microarnatic conditions. Day-to-day changes in plant water potential generally correlated more closely with changes in potential evapotranspiration than with changes in soil moisture content. Many of the daily changes observed in the plants remain unexplained, however. In general, the average water potential levels of all the field-grown plants were lower than levels reported from growth chamber studies. Potentials seldom rose above -8 bars and were never observed above -5 bars.Additional index words: Soil water, Soil temperature, Microclimate.

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Water Potential Measurements in Trees

Cited by 51 publications

References 14 publications

Review. Use of psychrometers in field measurements of plant material: accuracy and handling difficulties

Review. Use of psychrometers in field measurements of plant material: accuracy and handling difficulties

Water Uptake by Cotton Roots During an Irrigation Cycle

Response of Plant Water Potential to the Irrigated Environment of Southern Idaho¹

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Water Potential Measurements in Trees

Cited by 51 publications

References 14 publications

Review. Use of psychrometers in field measurements of plant material: accuracy and handling difficulties

Review. Use of psychrometers in field measurements of plant material: accuracy and handling difficulties

Water Uptake by Cotton Roots During an Irrigation Cycle

Response of Plant Water Potential to the Irrigated Environment of Southern Idaho1

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Response of Plant Water Potential to the Irrigated Environment of Southern Idaho¹