A Constant-Potential Soil Water Sampler

1983 ◽  
Vol 47 (3) ◽  
pp. 606-608 ◽  
Author(s):  
H. Riekerk ◽  
L. A. Morris
Keyword(s):  
Soil Water ◽  
Water Sampler ◽  
Constant Potential

A NUMERICAL TECHNIQUE FOR MODELING TRANSIENT FLOW OF WATER TO A SOIL WATER SAMPLER

Soil Science ◽  
1986 ◽  
Vol 141 (3) ◽  
pp. 230-236 ◽  
Author(s):  
T. N. NARASIMHAN ◽  
SHIRLEY J. DREISS
Keyword(s):  
Soil Water ◽  
Transient Flow ◽  
Numerical Technique ◽  
Water Sampler

Controlling soil water matric potential in root disease studies

1977 ◽  
Vol 55 (7) ◽  
pp. 825-830 ◽  
Author(s):  
B. D. Wisbey ◽  
T. A. Black ◽  
R. J. Copeman
Keyword(s):  
Polyethylene Glycol ◽  
Plant Growth ◽  
Soil Water ◽  
Flow Rate ◽  
Potential Difference ◽  
Matric Potential ◽  
Water Requirements ◽  
Constant Potential ◽  
Vigorous Plant ◽  
Two Sides

Soil contained in 5.6 × 2.0 × 10.5 cm Plexiglas soil containers was separated from solutions of polyethylene glycol (PEG) 6000 by a Pellicon ultrafiltration membrane glued over the inside of 3.8-cm-diameter holes in two sides. Flow rate through the membrane was 4.4 ml day−1 cm−2 for a 1.0-bar potential difference across the membrane. At the end of 2 weeks, the average matric potential in the soil adjacent to the membranes for soil cells immersed in −0.2-, −1.0-, and −2.0-bar PEG solutions was −0.3, −1.1, and −2.3 bars respectively. The relatively constant potential and vigorous plant growth during the period indicated that sufficient water was passing through the membrane to meet the plant's water requirements. The Pellicon membrane's tolerance to microbial deterioration will permit the use of this technique in longer term studies than previously has been possible.

Sign in / Sign up

Export Citation Format

Share Document