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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: SOIL & TILLAGE RESEARCH; v. 216, FEB 2022.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 13/18594-4 - Qualidade da matéria orgânica do solo em função do sistema de produção e da aplicação superficial de calcário e silicato
• Beneficiário: Jayme Ferrari Neto
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 13/18694-9 - Formas de silício num latossolo sob sistema plantio direto em função da aplicação superficial de silicato de cálcio e de magnésio em experimento de longa duração
• Beneficiário: João Arthur Antonangelo
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 11/10566-6 - Alterações físicas e químicas e fracionamento da matéria orgânica do solo em função do sistema de produção e da aplicação superficial de silicato e calcário
• Beneficiário: Jayme Ferrari Neto
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/02000-8 - Nutrição, cátions hidrossolúveis e produtividade do feijão-caupi em função da aplicação superficial de calcário e silicato
• Beneficiário: Matheus Gabriel Palhano
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 14/08768-8 - Especiação química de alumínio na solução do solo pela espectroscopia de ressonância nuclear magnética (27Al-RNM)
• Beneficiário: João Arthur Antonangelo
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Mestrado