scholarly journals Use of the Dual-Probe Heat-Pulse Technique to Monitor Soil Water Content in the Vadose Zone

2003 ◽  
Vol 2 (4) ◽  
pp. 572-579 ◽  
Author(s):  
T. E. Ochsner ◽  
R. Horton ◽  
T. Ren
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Vadose Zone ◽  
Heat Pulse ◽  
Pulse Technique ◽  
Dual Probe

scholarly journals Use of the Dual-Probe Heat-Pulse Technique to Monitor Soil Water Content in the Vadose Zone

2003 ◽  
Vol 2 (4) ◽  
pp. 572 ◽  
Author(s):  
Tyson E. Ochsner ◽  
Robert Horton ◽  
Tusheng Ren
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Vadose Zone ◽  
Heat Pulse ◽  
Pulse Technique ◽  
Dual Probe

scholarly journals Use of the Dual-Probe Heat-Pulse Technique to Monitor Soil Water Content in the Vadose Zone

2003 ◽  
Vol 2 (4) ◽  
pp. 572-579 ◽  
Author(s):  
Tyson E. Ochsner ◽  
Robert Horton ◽  
Tusheng Ren
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Vadose Zone ◽  
Heat Pulse ◽  
Pulse Technique ◽  
Dual Probe

scholarly journals Measuring Soil Water Content under Turfgrass Using the Dual-probe Heat-pulse Technique

1998 ◽  
Vol 123 (5) ◽  
pp. 937-941 ◽  
Author(s):  
Y. Song ◽  
J.M. Ham ◽  
M.B. Kirkham ◽  
G.J. Kluitenberg
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Tall Fescue ◽  
Soil Column ◽  
Gravimetric Method ◽  
Soil Surface ◽  
Heat Pulse ◽  
Pulse Technique ◽  
Dual Probe

Measurements of soil water content near the soil surface often are required for efficient turfgrass water management. Experiments were conducted in a greenhouse to determine if the dual-probe heat-pulse (DPHP) technique can be used to monitor changes in soil volumetric water content (θv) and turfgrass water use. `Kentucky 31' Tall fescue (Festuca arundinacea Schreb.) was planted in 20-cm-diameter containers packed with Haynie sandy loam (coarse-silty, mixed, calcareous, mesic Typic Udifluvents). Water content was measured with the DPHP sensors that were placed horizontally at different depths between 1.5 and 14.4 cm from the surface in the soil column. Water content also was monitored gravimetrically from changes in container mass. Measurements started when the soil surface was covered completely by tall fescue. Hence, changes in θv could be attributed entirely to water being taken up by roots of tall fescue. Daily measurements were taken over multiple 6- or 7-day drying cycles. Each drying cycle was preceded by an irrigation, and free drainage had ceased before measurements were initiated. Soil water content dropped from ≈0.35 to 0.10 m3·m-3 during each drying cycle. Correlation was excellent between θv and changes in water content determined by the DPHP and gravimetric methods. Comparisons with the gravimetric method showed that the DPHP sensors could measure average container θv within 0.03 m3·m-3 and changes in soil water content within 0.01 m3·m-3.

Root-zone hydraulic lift evaluated with the dual-probe heat-pulse technique

Soil Research ◽  
2000 ◽  
Vol 38 (5) ◽  
pp. 927 ◽  
Author(s):  
Y. Song ◽  
M. B. Kirkham ◽  
J. M. Ham ◽  
G. J. Kluitenberg
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Root Zone ◽  
Sandy Loam ◽  
Soil Column ◽  
Heat Pulse ◽  
Hydraulic Lift ◽  
Pulse Technique ◽  
Dual Probe

Roots are movers of water in the soil. One method of movement is through hydraulic lift, which occurs when plants extract water from a moist subsoil and release it into a dry topsoil. Detection of hydraulic lift has been hampered by the lack of instruments sensitive enough to measure the small amount of water moved. Recently, the dual-probe heat-pulse (DPHP) technique has been used to monitor with fine spatial resolution the soil water content in root-zones. The objective of this research was to determine if water is released by hydraulic lift, using the DPHP technique. Sunflower (Helianthus annuus L.) was grown in a column (38 cm height; 25 cm diam.; bulk density = 1.45 Mg/m3) packed with a Haynie very fine sandy loam (coarse-silty, mixed, calcareous, mesic Mollic Udifluvents; FAO-Eutric Fluvisols) with its roots divided between a top dry layer and a lower wet layer. Eight DPHP sensors installed in the soil column were used to monitor soil water content. During 24 measurement days, hydraulic lift was evident only when the plant was wilted. This occurred when the lower ‘wet’ layer had been allowed to dry and then it was re-watered. At this time, the roots in the upper dry layer released water, increasing the soil water content in the centre of the root mass by 0.019 m3/m3 (increase from 0.121 m3/m3 to 0.140 m3/m3). The soil-water increase was similar to other values reported in the literature and show it to be small.

Dual probe heat pulse technique for measuring soil water content and sunflower water uptake

1999 ◽  
Vol 50 (3-4) ◽  
pp. 345-348 ◽  
Author(s):  
Yan Song ◽  
M.B Kirkham ◽  
J.M Ham ◽  
G.J Kluitenberg
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Water Uptake ◽  
Heat Pulse ◽  
Pulse Technique ◽  
Dual Probe

Laboratory Evaluation of the Dual-Probe Heat-Pulse Method for Measuring Soil Water Content

2003 ◽  
Vol 2 (3) ◽  
pp. 389
Author(s):  
J. M. Basinger ◽  
G. J. Kluitenberg ◽  
J. M. Ham ◽  
J. M. Frank ◽  
P. L. Barnes ◽  
...  
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Pulse Method ◽  
Heat Pulse ◽  
Laboratory Evaluation ◽  
Dual Probe

Field Evaluation of the Dual-Probe Heat-Pulse Method for Measuring Soil Water Content

2003 ◽  
Vol 2 (4) ◽  
pp. 552 ◽  
Author(s):  
J. L. Heitman ◽  
J. M. Basinger ◽  
G. J. Kluitenberg ◽  
J. M. Ham ◽  
J. M. Frank ◽  
...  
Keyword(s):  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Field Evaluation ◽  
Pulse Method ◽  
Heat Pulse ◽  
Dual Probe
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