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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Lime and calcium-magnesium silicate in the ionic speciation of an Oxisol

Full text
Author(s):
João Arthur Antonangelo [1] ; Jayme Ferrari Neto [2] ; Carlos Alexandre Costa Crusciol [3] ; Luís Reynaldo Ferracciú Alleoni [4]
Total Authors: 4
Affiliation:
[1] Oklahoma State University. Dept. of Plant and Soil Sciences - Estados Unidos
[2] La Salle Faculty. Sociedade Porvir Científico - Brasil
[3] São Paulo State University. FCA. Dept. of Crop Science - Brasil
[4] University of São Paulo. ESALQ. Dept. of Soil Science - Brasil
Total Affiliations: 4
Document type: Journal article
Source: Scientia Agricola; v. 74, n. 4, p. 317-333, 2017-08-00.
Abstract

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. (AU)

FAPESP's process: 13/18694-9 - Forms of silicon in an oxisol under no till system in function of surface application of calcium-magnesium silicate in experiment of long duration
Grantee:João Arthur Antonangelo
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 11/10566-6 - PHYSICAL AND CHEMICAL CHANGES AND FRACTIONATION OF SOIL ORGANIC MATTER AS FUNCTION AS CROP SYSTEM AND SUPERFICIAL LIMING AND SILICATE APPLICATION
Grantee:Jayme Ferrari Neto
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 13/18594-4 - Soil organic matter quality as a function of the crop system and surface application of lime and calcium and magnesium silicate
Grantee:Jayme Ferrari Neto
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 14/08768-8 - Chemical speciation of aluminum in soil solution by nuclear magnetic resonance spectroscopy (27Al-NMR)
Grantee:João Arthur Antonangelo
Support Opportunities: Scholarships abroad - Research Internship - Master's degree
FAPESP's process: 13/02000-8 - Nutrition, water-soluble and yield of cowpea as function as lime and silicate surface application
Grantee:Matheus Gabriel Palhano
Support Opportunities: Scholarships in Brazil - Scientific Initiation