| Abstrak/Abstract |
Ultisols is one of soil types that undergoes further weathering and displays the most active
cations leaching caused by precipitation. This study aimed to observe the effect of calcite
appl
ication (CaCO
3
) and gypsum (Ca
2
SO
4
) on valence 2 cations, such as Ca and Mg. This study
was conducted in Experimental Field of Gula Putih Mataram Enterprise, Central Lampung. Split
-
plot design with 3 replications was used as the experimental design. The ap
plication of calcite as
the main plot and the application of gypsum as the sub plot. The analysis shows that Ca analysis
of leachate was relatively high than Mg if the higher rainfall happened. It could dissolve Ca from
topsoil to subsoil and eventually Ca
exits the soil system (solum). Meanwhile, Mg leaching by
precipitation could not give clear results. It can be assumed that high rainfall would leach Ca first
and then Mg, even though according to lyotropic series the bonds of Ca
2+
is slightly stronger
th
an Mg
2+
. It indicates that Mg solubility by precipitation indirectly caused by high Ca solubility
due to the application of calcite and gypsum. The addition of lime about 1 ton ha
-
1
, rainfall at
1264,2 mm for 166 days, caused the leaching of Ca about 596 m
g and Ca uptake about 3.229 mg
which is equivalent to its addition about 14.676 mg in soil. The addition of gypsum about 0,25
ton ha
-
1
will prompt the leaching about 538 mg and Mg uptake about 3.072 mg. Therefore, the
application of calcite and gypsum in u
ltisols with high rainfall resulted in higher leaching of Ca
compare to Mg. |
