Lime and calcium-magnesium silicate in the ionic speciation of an Oxisol
ABSTRACT Plant residues and certain fertilizers accelerate soil acidification and increase the levels of aluminum-Al+3 in soils under no-tillage (NT). Silicates act as acidity amendments and as a source of silicon as in H4SiO4. An increase in the pH of soil solution causes the deprotonation of H4SiO...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Universidade de São Paulo
|
Series: | Scientia Agricola |
Subjects: | |
Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000400317&lng=en&tlng=en |
id |
doaj-dfb33ef73b74495c8480e604b4a6129d |
---|---|
record_format |
Article |
spelling |
doaj-dfb33ef73b74495c8480e604b4a6129d2020-11-24T23:17:15ZengUniversidade de São PauloScientia Agricola1678-992X74431733310.1590/1678-992x-2016-0372S0103-90162017000400317Lime and calcium-magnesium silicate in the ionic speciation of an OxisolJoão Arthur AntonangeloJayme Ferrari NetoCarlos Alexandre Costa CrusciolLuís Reynaldo Ferracciú AlleoniABSTRACT Plant residues and certain fertilizers accelerate soil acidification and increase the levels of aluminum-Al+3 in soils under no-tillage (NT). Silicates act as acidity amendments and as a source of silicon as in H4SiO4. An increase in the pH of soil solution causes the deprotonation of H4SiO4 and generates the anionic form (H3SiO4−). The aim of this study was to evaluate the ionic speciation of Si, Al, Ca, Mg and K in aqueous extracts by means of a software calculation. Since 2006, a field experiment has been under way on an Oxisol under NT subjected to lime and calcium-magnesium silicate applications under four crop systems. The amendments were applied in Oct 2006 and in Oct 2011, aiming to raise base saturation to 70 %. Soil samples were collected in Oct 2013, at depths of 0-5, 5-10, 10-20, 20-40 and 40-60 cm. Both Ca and Mg formed complexes with dissolved organic carbon (DOC) whereas the same was not observed for potassium. These three basic cations were mostly in their free forms regardless of treatment, while Al was mostly complexed with DOC even at the lowest depths (40-60 cm). The highest value of free Al form was 15 %. Si was almost 100 % as H4SiO4, and its activity was similar to its concentration in solution for all crop systems and at all depths, regardless of amendment applied. The percentages of H3SiO4− and Al-H3SiO42+ were irrelevant, providing more phytoavailable H4SiO4 in soil solution.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000400317&lng=en&tlng=ensoil solutioncations speciationaqueous extractionamendments |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
João Arthur Antonangelo Jayme Ferrari Neto Carlos Alexandre Costa Crusciol Luís Reynaldo Ferracciú Alleoni |
spellingShingle |
João Arthur Antonangelo Jayme Ferrari Neto Carlos Alexandre Costa Crusciol Luís Reynaldo Ferracciú Alleoni Lime and calcium-magnesium silicate in the ionic speciation of an Oxisol Scientia Agricola soil solution cations speciation aqueous extraction amendments |
author_facet |
João Arthur Antonangelo Jayme Ferrari Neto Carlos Alexandre Costa Crusciol Luís Reynaldo Ferracciú Alleoni |
author_sort |
João Arthur Antonangelo |
title |
Lime and calcium-magnesium silicate in the ionic speciation of an Oxisol |
title_short |
Lime and calcium-magnesium silicate in the ionic speciation of an Oxisol |
title_full |
Lime and calcium-magnesium silicate in the ionic speciation of an Oxisol |
title_fullStr |
Lime and calcium-magnesium silicate in the ionic speciation of an Oxisol |
title_full_unstemmed |
Lime and calcium-magnesium silicate in the ionic speciation of an Oxisol |
title_sort |
lime and calcium-magnesium silicate in the ionic speciation of an oxisol |
publisher |
Universidade de São Paulo |
series |
Scientia Agricola |
issn |
1678-992X |
description |
ABSTRACT Plant residues and certain fertilizers accelerate soil acidification and increase the levels of aluminum-Al+3 in soils under no-tillage (NT). Silicates act as acidity amendments and as a source of silicon as in H4SiO4. An increase in the pH of soil solution causes the deprotonation of H4SiO4 and generates the anionic form (H3SiO4−). The aim of this study was to evaluate the ionic speciation of Si, Al, Ca, Mg and K in aqueous extracts by means of a software calculation. Since 2006, a field experiment has been under way on an Oxisol under NT subjected to lime and calcium-magnesium silicate applications under four crop systems. The amendments were applied in Oct 2006 and in Oct 2011, aiming to raise base saturation to 70 %. Soil samples were collected in Oct 2013, at depths of 0-5, 5-10, 10-20, 20-40 and 40-60 cm. Both Ca and Mg formed complexes with dissolved organic carbon (DOC) whereas the same was not observed for potassium. These three basic cations were mostly in their free forms regardless of treatment, while Al was mostly complexed with DOC even at the lowest depths (40-60 cm). The highest value of free Al form was 15 %. Si was almost 100 % as H4SiO4, and its activity was similar to its concentration in solution for all crop systems and at all depths, regardless of amendment applied. The percentages of H3SiO4− and Al-H3SiO42+ were irrelevant, providing more phytoavailable H4SiO4 in soil solution. |
topic |
soil solution cations speciation aqueous extraction amendments |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000400317&lng=en&tlng=en |
work_keys_str_mv |
AT joaoarthurantonangelo limeandcalciummagnesiumsilicateintheionicspeciationofanoxisol AT jaymeferrarineto limeandcalciummagnesiumsilicateintheionicspeciationofanoxisol AT carlosalexandrecostacrusciol limeandcalciummagnesiumsilicateintheionicspeciationofanoxisol AT luisreynaldoferracciualleoni limeandcalciummagnesiumsilicateintheionicspeciationofanoxisol |
_version_ |
1725584026526285824 |