#Soil pH, Ca and Mg Stability and pH Association with Temperature and Groundwater Silicon by Timo Töysä in BJSTR
Abstract
Objective: It is generally known that pH, Ca and Mg have
changed remarkably during 1961-90, but their inter-areal variation seems
not
have been fully discussed nor explained. Parameters of cropland have
been earlier associated with CHD mortality. Silicon (Si) and temperature
(Temp) have been earlier assessed with human CHD mortality. In this
study we have assessed soil values of 21 Rural Centers (RC) from the
1960’s, 1970’s and 1980’s, [(60’s) (70’s), (80’s)] with respective mean
annual temperatures from 1981-2010 and mean groundwater (gw) Si
content.
Results: Combined regression by pH(60’s) and pH(70’s)
explained pH(80) by 96.8 % (p < 0.001). Ca. (60’s) and Ca.(70’s)
explained
respectively Ca.(80’s) by 99.3 % (p < 0.001) and Mg.(60’s) and
Mg.(70’s) explained respectively Mg.(80’s) by 92.3 % (p < 0.001).
Combined
regression by Temp and Si explained pH (80’s) by 86.5 % (p < 0.001).
Respectively combined regression by Temp and pH (80’s) explained gw
Si by 77.5 % (p < 0.001).
Conclusion: Groundwater silicon is associated with the soil
matrix factor (sources of groundwater silicon/silicon colloids?), which
seems
with temperature to explain inter-areal pH variation and obviously is
associated with relative local stability of cropland Ca and Mg (and soil
fertility). Maybe now is the time to increase Si trials in agriculture.
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