TITLE:
Phosphorus Adsorption of Some Brazilian Soils in Relations to Selected Soil Properties
AUTHORS:
Valdinar Ferreira Melo, Sandra Cátia Pereira Uchôa, Zachary N. Senwo, Ronilson José Pedroso Amorim
KEYWORDS:
Amazon Soil, Eutrophic Soils, Oxidic Soils, Phosphate, Alfisol, Oxisol
JOURNAL NAME:
Open Journal of Soil Science,
Vol.5 No.5,
May
20,
2015
ABSTRACT: A major nutritional problem to crops grown in highly weathered Brazilian
soils is phosphorus (P) deficiencies linked to their low availability and the
capacity of the soils to fix P in insoluble forms. Our studies examined factors
that might influence P behavior in soils of the Amazon region. This study was
conducted to evaluate the maximum phosphate adsorption capacity (MPAC) of the
soils developed from mafic rocks (diabase),
their parent materials and other factors resulting in the formation of
eutrophic soils having A chernozemic horizon associated with Red Nitosols
(Alfisol) and Red Latosols (Oxisol) of the Amazonian environment. The MPAC was
determined in triplicates as a function of the remnant P values. The different
concentrations used to determine the MPAC allowed maximum adsorption values to
be reached for all soils. The Latosol (Oxisol) and Nitosol (Alfisol) soils presented higher phosphate
adsorption values that were attributed to the oxidic mineralogy and high
clay texture while the Chernosol (Mollisol) soils presented the lowest phosphate
adsorption values.