259
influence groundwater quality, and the amount of NH 4
+
, PO 4
3−
, and Fe is attributed
mostly to the use of fertilizers in the investigated region. When groundwater quality
situated under the agriculture activities is the purpose of investigation and its main
use is for irrigation, it is suggested to perform factor analysis for deep and shallow
groundwater samples separately if statistical analysis shows significant differences
between shallow and deep groundwater, to achieve more reliable results. Constant
pumping of groundwater and its permanent circulation through the soil layers will
tend to influence the soil quality and have a different effect on shallow and deep
groundwater. These differences may lead to confusing results when variables from
shallow and deep groundwater are statistically processed together.
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8 Groundwater Pollution Under the Intensive Agriculture Production
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