03783nab a2200325 i 4500003000900000005001700009008004100026040001800067072001400085072001400099100003900113100003100152100002700183100003400210100002300244245009800267500006700365520124800432520136901680650001003049650000903059650002203068650003503090650001203125650002403137773019003161856007903351942000803430999001903438BR-BrBNA20260312110636.0260312b2018    bl.qr|pooa||| 00| 0 eng |  aBR-BrBNAbeng  aP33b0120  aP35b0336  aCunha, Gabriel Octávio de Mello   aAlmeida, Jaime Antonio de   aErnani, Paulo Roberto   aPereira, Éderson Rodrigues   aBrunetto, Gustavo   aComposition, chemical speciation and activity of ions in the solution of Brazilian acid soils  a

Publicação online; 41 ref.; 3 tables; Summaries (En, Pt)  a


ABSTRACT:      The knowledge of the chemical composition of the soil solution through chemical speciation is important for the monitoring of nutrient availability, soil fertility management and plant nutrition. The objective of this study was to evaluate the chemical composition and activity of Al, cations and anions by chemical speciation in solution of some Brazilian acid soils (AC, PE, RS and SC) submitted to liming and cultivated with soybean and maize plants. In addition, to identify the chemical elements responsible for the reduction of Al activity in the solution and its toxicity to plants. The predominant aluminum, calcium, magnesium, potassium, sulfate, chloride and nitrate species in all soils were: Ca2+ and Mg2+, K+, SO42-, Cl- and NO3- in all soils. In the treatments without limestone in the soils AC9, RS and CB predominated the species of P H2PO4- and in the soils PE and BR was the AlHPO4+. However, with liming the P form that predominated in all soils was H2PO4- and, to a lesser extent, HPO42-. The activity of the Ca2+and Mg2+ ions was the main responsible for the neutralization of the toxic effects of Al3+ in the evaluated plants.  


Key words:      anions; dolomitic limestone; cations; complexes; plants  a


RESUMO:      O conhecimento da composição química da solução do solo, por meio da especiação química, é importante para o acompanhamento da disponibilidade de nutrientes para o manejo da fertilidade do solo e da nutrição de plantas. O estudo objetivou avaliar a composição química e a atividade do Al, dos cátions e dos ânions, por meio da especiação química, na solução de alguns solos ácidos brasileiros (AC, PE, RS e SC) submetidos à calagem e cultivados com plantas de soja e milho. Além disso, identificar os elementos químicos responsáveis pela redução da atividade do Al na solução e sua toxidez às plantas. As espécies químicas de alumínio, cálcio, magnésio, potássio, sulfato, cloreto e nitrato predominantes em maiores proporções em todos os solos foram: Al3+, Ca2+ e Mg2+, K+, SO42-, Cl- e NO3-. Nos tratamentos sem calcário nos solos AC9, RS e CB predominou a espécie de P H2PO4- e nos solos PE e BR foi a AlHPO4+. Porém, com a calagem a forma de P que predominou em todos os solos foi a H2PO4- e, em menor proporção, a HPO42-. A atividade dos íons Ca2+ e Mg2+ foi a principal responsável pela neutralização dos efeitos tóxicos do Al3+ nas plantas avaliadas.    


Palavras-chave:      ânions; calcário dolomítico; cátions; complexos; plantas  aMILHO  aSOJA  aANÁLISE DO SOLO  aPROPRIEDADE FÍSICO-QUÍMICA  aCALAGEM  aFERTILIDADE DO SOLO0 046569360617dRecife-PE Universidade Federal Rural de Pernambuco 2006o2026-0999tRevista Brasileira de Ciências Agrárias (Brazil)x1981-1160gv. 13(3) p. 1-10; (2018)wBR2025005676  uhttp://www.agraria.pro.br/ojs32/index.php/RBCA/article/view/v13i3a5542/299  cANA  c340367d340367