SciELO - Scientific Electronic Library Online

 
vol.41 número3Análise da variação espacial e sazonal e de tendências na precipitação da região sul do Brasil índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Revista

Articulo

Indicadores

Links relacionados

  • No hay articulos similaresSimilares en SciELO

Compartir


Revista de Ciências Agrárias

versión impresa ISSN 0871-018X

Resumen

PORTELA, Ester  y  ABREU, Maria Manuela. Potassium fixation in Portuguese soils. Rev. de Ciências Agrárias [online]. 2018, vol.41, n.3, pp.11-20. ISSN 0871-018X.  https://doi.org/10.19084/RCA18100.

In Portugal, since the 1930s, the results of experimentation on potassium fertilization have frequently caused perplexity among researchers. In such cases, where clear responses to K were expected due to low K concentrations in the soils, they did not occur or were very slow in manifesting themselves, particularly in the south of the country. In this review paper a retrospective of the existing experimentation was carried out where the inefficacy of K fertilization was evident. In addition, an inventory of soil types was made where evidence of K fixation had been most often detected, either through experimental trials or through laboratory tests. The laboratory data refer to the determination of soil K fixation capacity. With regard to K fixation, in addition to the identification of the K-fixing soils, the propitious factors for fixation of this nutrient are discussed, highlighting the mineralogical composition of soils in the clay, silt and fine sand fractions. Finally, based on the studies already carried out, some strategies to be followed in potassium fertilization were proposed.

Palabras clave : phyllosilicates; mineralogy of soil fractions; extractable potassium; exchangeable potassium; potassium fixation capacity.

        · resumen en Portugués     · texto en Portugués     · Portugués ( pdf )

 

Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons