dasar ilmu tanah kemasaman tanah dan masalahnya
TRANSCRIPT
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Sumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
KEMASAMAN TANAH
&Permasalahannya
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Soil Acidity:
auses and Impacts
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Sumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
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Sumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
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Sumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
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1. Asam KarbonatCarbon dioxide gas from soil air dissolves in
waterRoot respiration and soil decomposition provideextra CO2
CO2 !2O !2CO" !CO"#
!
2. Asam#asam dari $etabolism %iologis$icrobes brea& down organic matter' prod(cing
organicacids s(c) as citric acid' carbox*lic acids andp)enolic acids
RC!2O!+ O2 !2O RCOO! RCOO#
!
Sumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
roses#proses engasaman /ana)
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0. O&sidasi itrogen ,itrication-itrogen memas(&i tana) sebagai !0
3i(ba) men4adi asam nitrat .
!0 2O2 !2O !
! O"#
5. O&sidasi S(lp)(r6. Asam#asam dalam air )(4an
!2SO0 SO02# 2!
!O" O"#
!
7. lant 8pta&e of Cationslants ex(de ! ions or ta&e (p anions ,eg.SO
0
2#- to
balance o9 cation (pta&eSumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
roses#proses engasaman /ana)
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Kation ! *ang di4erap pada perm(&aan liatdapat mer(sa& str(&t(r mineral dan melepas&anAl" dalam prosesn*a
Al(mini(m sangat to&si& bagi &eban*a&an 4enis
tanaman
Al memac( )idrolisis !2O
Al bergab(ng dnegan O!#
' meninggal&an !
dalam lar(tan tana)
/olerant plants secrete organic acids into t)esoil aro(nd
t)e root. Organic acids s(c) as ,eg. malate orSumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
/o&sisitas Al.
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9/23Sumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
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1. Acids are ne(trali:ed in soils wit) available bases
2. Canadian S)ield severel* a9ected in central and easternCanadaSumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
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! !SO"#
SO2 SO"sun
O2!2SO0 ↔2!
SO02#
! O"#
22; O20O
!2O
0O2 2!O" 2!O22O2 22O
Sumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
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•
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>fe& p! tana)/er)adap K/K
K/K mening&atdengan p!
&arena=
,i- %inding andrelease of ! ions on p!#
dependentc)argesites
,ii-!*drol*sisSumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
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ersen Ke4en()an %asa ,K%-
? cmol of exc)angeable Ca2 $g2 K
a
cmolc of C>C
? 1;; @ persen &e4en()an asam.
!ote: Percent acid saturation, though less often cited, is determinedbycmolc Al
3+ & H+ ions divided by cmolc of CEC. This is actually more
meaningful, because Ca, g, ! and "a ions are not true bases#
Sumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
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1. So"ls #"th h"gh cla$ or organ"c content tento ha&e the h"ghest bu'er"ng ca(ac"t$
2. )h$* +m(ortance o, e-changeable an
res"ual ac""t$
Conto) roses en*angga=
,i- Al(mini(m )*drol*sis ,in ver* acid soils-
AlO2 2O → AlO3
A"ng more "ons #"ll r"&e the react"on to the le,t.
Sumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
roses#proses en*angga dalam tana)
d l t )
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16/23Sumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
roses#proses en*angga dalam tana)
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,ii- rotonation and deprotonation of organic matter
"ons "ssoc"ate #hen a base "s ae (re&ent"ng( ,rom r"s"ng as much as e-(ecte.
"ncreases as the "ons are remo&e "ncreas"ngthe negat"&e charges
,iii- p!#dependent c)arge sites in cla*s
Aga"n a"ng a base "ssoc"ates "ons ,rom h$ro-$lgrou(s an o-$gen atoms
,iv- Cation exc)ange
As "ons are ae most en u( attracte to negat"&echarge s"tes so that ( changes less than e-(ecte. +, abase "s ae the$ are re(lace b$ "ons or Al "ons,rom e-change s"tes. most e'ect"&e #hen (45.
,v- Carbonate dissol(tion and precipitation 6. 7.18
Sumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
roses#proses en*angga dalam tana)
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"m"ng"me reacts #"th O2 an 2O to (rouce b"carbonate
O39
Example:O3
9 2 → O2 2O
agO32 22O 2O2↔ a2 2O3
9 g2 2O39
•;"carbonate "s reactive wit) exc)angeableandresid(al soil acidit*
•
a2
an g2
replace !
and Al"
on cla*
H+
Soil Colloid + CaCO3
Soil Colloid-Ca++ + H2
O + CO2
H+
Sumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
PENGAP!AN
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roses#proses *ang mempengar()i p!tana)
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20/23Sumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
>f & ) d ! )
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>fe& engap(ran ter)adap p! tana)
>f & ! t ) t ) d & d ! d
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>fe& p! tana) ter)adap &and(ngan !ara dan$i&roba /ana)
Sumber: classes.uleth.ca/200801/geog3080a/SOILS%20PART%20V%202008.ppt
t ! t )
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,i-$etode at ewarnaCertain organic compo(nds c)angecolo(r inresponse to p!
3rops of d*e sol(tion can be placed onw)itespot plate ,in contact wit) soil-
,ii-$etode otentiometri& 3i9erence between ! ion activit* insoil s(spension and glass electrodegives p!
Sumber: classes uleth ca/200801/geog3080a/SOILS%20PART%20V%202008 ppt
enent(an p! tana)