SciELO - Scientific Electronic Library Online

 
vol.36 número5Absorção e translocação comparada de boro por cultivares de algodãoTransformação de fósforo em camas de aviário e em Latossolo tratado com cama de aviário avaliadas por meio de 31P-RMN e fracionamento químico índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Revista Brasileira de Ciência do Solo

versão On-line ISSN 1806-9657

Resumo

ROSOLEM, Ciro Antonio; VICENTINI, João Paulo Testa Moura Montans  e  STEINER, Fábio. Potassium supply as affected by residual potassium fertilization in a Cerrado Oxisol. Rev. Bras. Ciênc. Solo [online]. 2012, vol.36, n.5, pp.1507-1515. ISSN 1806-9657.  http://dx.doi.org/10.1590/S0100-06832012000500015.

In some soils with low levels of exchangeable potassium, non-exchangeable forms can participate in plant supply. There is evidence that K supply in non-exchangeable forms depends more on plant nutrient demand than on soil properties. The purpose of this study was to evaluate the supply and depletion of K forms in a Cerrado Oxisol, as affected by residual K fertilization and successive cultivation of Brachiaria ruziziensis (Syn. Urochloa ruziziensis). Soil samples were collected in the 0-20 cm layer in plots of a field experiment installed in 2001, where soil had been fertilized for 10 years with 0, 60, 120 and 180 kg ha-1 of K2O. In a greenhouse, 0, 150 and 300 mg dm-3 K was applied to the soil samples and B. ruziziensis was grown and cut five times. The K supply of the plants depended more on the newly added fertilizer than on the residual effect of previous fertilization. The non-exchangeable K is responsible, over time, for the maintenance of exchangeable K levels and becomes the main source of K for B. ruziziensis plants in the absence of K fertilization. Brachiaria ruziziensis plants have the capacity to absorb large amounts of K from the soil, confirming the importance of this cover crop for soil nutrient cycling.

Palavras-chave : Brachiaria ruziziensis; non-exchangeable K; available; fertilization.

        · resumo em Português     · texto em Português     · Português ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons