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The purpose of this research is to investigate the soil
moisture variation for the Betel Palm farm located on sloped
land .The research site is situated at Chi-Chi Town of Nan-Tou
County. The resistance values observed by the soil moisture
sensors can react to variations of soil moisture by
transforming to the digital types of gravimetric water content
and equivalent depth. The study contains the infiltration site
test and long-term observations of soil moisture variation. At
the beginning the infiltration test used 6 soil moisture
sensors buried in the soil and 8 sensors were buried later.
Observations of the total 14 sensors help us to realize the
influence upon hydrologic budget of Betel Palm farm on sloped
land. The result could be summarized to the: 1.Soil moisture
being abundant during the height of convective precipitation ,
but became in short supply in the last phase of the rain
season. 2.Largest variation which occurred from the top soil to
a depth of 30 cm because of large pore size. 3.Horizontal
seapage velocity was much faster than vertical current velocity
according to the infiltration test in the Betel Palm farm of
sloped land. 4.Increase of soil moisture which was greatly
influenced by the water gradient.
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