+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Extended field use of screen covered thermocouple psychrometers

Agronomy Journal 68(6): 995-996

Extended field use of screen covered thermocouple psychrometers

The use of screen-covered thermocouple psychrometers for in situ measurements of soil water potential has been criticized because of possible soil and microorganism contamination through the screen covering. Double-junction Peltier psychrometers with a screen covering were installed in the soil under field conditions for periods ranging from 2-40 mo. of continuous exposure, and were then removed and examined for evidence of loss of calibration sensitivity and contamination by soil particles and microorganisms. The uncleaned psychrometers were recalibrated in the laboratory and then disassembled and examined under a microscope (250 .times.) for contamination. Although slightly more than half of the units lost some sensitivity after field exposure, the average decrease was less than 5%. The psychrometer cavities were all nearly free of soil particles, the thermocouple junctions were shiny, and no evidence of microbial attack was evident. It appears that long-term field exposure of screen-covered psychrometers is no more detrimental to their performance than that of ceramic or other psychrometers.

(PDF 0-2 workdays service: $29.90)

Accession: 005432589

Related references

Field use of screen caged thermocouple psychrometers in sample chambers. Crop Science 23(4): 627-632, 1983

Field use of screen-caged thermocouple psychrometers in sample chambers for measurement of leaf water potential, wheat. Crop science 23(4): 627-632, 1983

A calibration model for screen-caged Peltier thermocouple psychrometers. Research Paper, Intermountain Forest and Range Experiment Station, USDA Forest Service (INT-293): i + 155, 1982

A technique to measure the components of root water potential using screen caged thermocouple psychrometers. Plant & Soil 103(2): 285-288, 1987

Measurement of water potential in the trunks of citrus trees using screen caged thermocouple psychrometers. South African Journal of Plant & Soil 5(4): 219-221, 1988

The field use of thermocouple psychrometers in desert soils. Psychrometry in Water Relations Research Proceedings of the Symposium on Thermocouple Psychrometers, Utah State University, March 17-19, 1971: 165-169, 1972

Field measurement of soil water potential with thermocouple psychrometers. Soil Science. 113: 2, 102-109, 1972

A microwelder for the construction of thermocouple junctions of Peltier effect thermocouple psychrometers. Psychrometry in Water Relations Research Proceedings of the Symposium on Thermocouple Psychrometer, Utah State University, March 17-19, 1971: 84-87, 1972

In situ field measurement of leaf water potential using thermocouple psychrometers. Plant Physiology 73(3): 609-613, 1983

Application of thermocouple psychrometers to field measurements of soil moisture potential. 1973