Estimating areas of influence in the unsaturated soil by solute suction samplers

P. K. Kalita, M. R. Keaton, Gary A. Clark

Research output: Contribution to journalConference articlepeer-review


Laboratory experiments were conducted at the Biological and Agricultural Engineering Department at Kansas State University, Manhattan, Kansas to estimate the area of influence around a porous ceramic cup under unsaturated conditions. Soil moistures sensors were placed around the porous cup at 1, 2, 3, 4, 6, and 8 inches above, below, and horizontally on all four sides of the porous cup which was installed in a plastic barrel filled with sand soil. Soil moisture resistances were recorded with a datalogger at various moisture conditions below field capacity of the soil. Two levels of suction (850 and 500 cm) were applied in the porous cup. The moisture flow rate and the radius of influence were not affected by the suction levels. Experimental results showed that only about 3-4 inches distances above the cup was influenced by the porous cup. Flow rate and radius of influence were also predicted by using a mathematical model and the results conform to the experimental findings.

Original languageEnglish (US)
JournalPaper - American Society of Agricultural Engineers
StatePublished - 1997
Externally publishedYes
EventProceedings of the 1997 ASAE Annual International Meeting. Part 1 (of 3) - Minneapolis, MN, USA
Duration: Aug 10 1997Aug 14 1997

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)


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