The status of silicon (Si) in agriculture, veterinary and human medicine is not clear. This survey is based on old data, but
groundwater (from springs and dugwells) data have been newly classified by 21 Rural Centers (RC). RC CHD has been estimated by provincial
data. The aim of this paper is to clarify associations between CHD mortality, groundwater (GW) hardness (Ca+Mg), Si.gw, cropland (soil)
(Ca+Mg) - a measure of soil fertility - and, pH and temperature (Temp) with regional parameters [latitude (Lat), longitude (Long)]. Regressions
are given separately for the whole Finland (“21.RC”) and continental Finland (“20.RC”), i.e. without Åland - the only RC with pH.soil > 6.2.
Directions of trend lines of variables have been approximated.