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

Comparative analysis of exchangeable aluminum in a tropical soil under long-term no-till cultivation

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Antonangelo, Joao Arthur [1] ; Neto, Jayme Ferrari [2] ; Costa Crusciol, Carlos Alexandre [3] ; Zhang, Hailin [1] ; Alleoni, Luis Reynaldo F. [4] ; Kinrade, Stephen D. [5]
Total Authors: 6
[1] Oklahoma State Univ, Dept Plant & Soil Sci, 371 Agr Hall, Stillwater, OK 74078 - USA
[2] Univ Catolica Dom Bosco, BR-79117900 Campo Grande, MS - Brazil
[3] Sao Paulo State Univ UNESP, Coll Agr Sci, Dept Crop Sci, R Jose Barbosa de Barros, BR-18610307 Botucatu, SP - Brazil
[4] Univ Sao Paulo, Luiz de Queiroz Coll Agr, Dept Soil Sci, BR-13418900 Piracicaba, SP - Brazil
[5] Lakehead Univ, Dept Chem, Thunder Bay, ON P7B 5E1 - Canada
Total Affiliations: 5
Document type: Journal article
Source: SOIL & TILLAGE RESEARCH; v. 216, FEB 2022.
Web of Science Citations: 0

Aluminum toxicity is a key determinant of crop yield for acid soils. Techniques used to characterize a soil's exchangeable Al content often yield discordant results, thus impeding the implementation of corrective measures. We critically compared three such techniques - back-titration, ICP-AES, and Al-27 NMR - for a tropical Oxisol under long-term (8-years) no-till cultivation involving four different cropping-systems and three pH control regimens. ICP-AES was superior in terms of accuracy, level of quantification (LOQ), practicable pH range, speed, cost, and versatility. By comparison, back-titration consistently overestimated exchangeable Al, whereas Al-27-NMR, though accurate, had a higher LOQ and is inherently non-quantitative between pH 5.4 and 6.3 owing to extreme quadrupolar broadening of Al(OH)(n)(H2O)(6-n)((3-n)) + (n = 1-3) signals. The only Al species detected by NMR in any of the soil extracts was the toxic Al hexaaqua cation, Al(H2O)(6)(3+), despite an appreciable presence of dissolved organic matter. Application of either dolomitic lime or calcium-magnesium silicate (CMS) as a pH corrective significantly decreased exchangeable Al in the upper soil layers. None of the decrease, however, was attributable to insoluble aluminosilicates having formed as a consequence of CMS dissolution. Rotation crops of wheat (T. aestivum) and showy rattlebox (C. spectabilis) depleted exchangeable Al in the upper soil layers, whereas palisade grass (Brachiaria brizantha) had no discernable effect on Al availability. Plots which incorporated any one of the three rotation crops provided equally high yields of soybean in year-8 when pH (1 M KCl) exceeded 4.9 +/- 0.2 and Al saturation was less than 25 +/- 5% (Al-ICP = 22 +/- 21 mg kg(-1)), on average, in the 0-20 cm soil horizon. (AU)

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: 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
Grantee:Jayme Ferrari Neto
Support Opportunities: Scholarships in Brazil - Doctorate
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
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