Back to Search
Start Over
National-scale spatial variations of soil phosphorus retention capacity in Brazil.
- Source :
-
Physics & Chemistry of the Earth - Parts A/B/C . Dec2022, Vol. 128, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- Phosphorus (P) retention capacity of soils directly affects the management of phosphate fertilization, and has economic and environmental importance. Brazil has expressive agricultural production and high edaphoclimatic variability; still, the detailed spatial distribution of P retention capacity is not known. Thus, machine learning models were created to estimate the P retention capacity of soils at superficial horizons using the variables: clay content, sand content, soil organic matter, pH, base saturation. The four best models were combined to create an ensemble (a combination of models), which was applied in a dataset (5524 samples) that comprises a sample data from the entire Brazilian territory. The ensemble was used to build a map of P retention capacity. Most of the country presented soils with medium P retention (40–60%), and large areas with very high retention capacity were found in the south of Brazil, a subtropical region mostly associated with clayey soils. High P retention was observed for Histosols, probably related to humic-Al(Fe) complexes. Nitisol, Ferralsol, Gleysol and Cambisol classes presented high P retention, especially for clayey soils with qualifiers related to bases/weathering (Dystric) and organic matter (Umbric and Humic). The correlation between Fe oxide minerals and P retention varied with soil color and drainage conditions mainly associated to redoximorphic reactions; the same was not observed for Al oxide minerals. This pioneer study revealed the distribution of P retention capacity across different soil classes in Brazil, which can help to define land use suitability and soil P management strategies that ensure profitable agricultural exploration. [Display omitted] • In 34% of the country, soils had P retention capacity framed as Low and 22% as High. • The Histosol class presenting soils with elevated P retention capacity (>60%). • For mineral soils, the highlighted classes were Nitisol, Ferralsol, Gleysol and Cambisol. • Soil color and drainage conditions had little effect on soil P retention capacity. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CLAY soils
*PHOSPHORUS in soils
*SPATIAL variation
*SOIL color
*HISTOSOLS
Subjects
Details
- Language :
- English
- ISSN :
- 14747065
- Volume :
- 128
- Database :
- Academic Search Index
- Journal :
- Physics & Chemistry of the Earth - Parts A/B/C
- Publication Type :
- Academic Journal
- Accession number :
- 160336232
- Full Text :
- https://doi.org/10.1016/j.pce.2022.103271