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Phosphorus Accumulation and Sorption in Calcareous Soil under Long-Term Fertilization.
- Source :
-
PLoS ONE . 8/19/2015, Vol. 10 Issue 8, p1-14. 14p. - Publication Year :
- 2015
-
Abstract
- Application of phosphorus (P) fertilizers to P-deficient soils can also result in P accumulation. In this study, soil P status and P uptake by apple trees were investigated in 5-, 10-, and 15-year-old orchards in the semi-arid Loess Plateau, China, and subset soils with different soil P statuses (14–90 Olsen-P mg kg−1) were selected to evaluate the characteristic P adsorption. Due to the low P-use efficiency (4–6%), total soil P increased from 540 mg kg−1 to 904 mg kg−1, Olsen-P ranged from 3.4 mg kg−1 to 30.7 mg kg−1, and CaCl2-P increased from less than 0.1 mg kg−1 to 0.66 mg kg−1 under continuous P fertilization. The P sorption isotherms for each apple orchard were found to fit the Langmuir isotherm model (R2 = 0.91–0.98). K (binding energy) and Qm (P sorption maximum) decreased, whereas DPS (degree of phosphorus sorption) increased with increasing P concentration. CaCl2-P increased significantly with the increase of Olsen-P, especially above the change point of 46.1 mg kg−1. Application of surplus P could result in P enrichment in P-deficient soil which has high P fixation capacity, thus posing a significant environmental risk. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHOSPHORUS in soils
*BIOACCUMULATION
*CALCAREOUS soils
*FERTILIZERS
*APPLES
Subjects
Details
- Language :
- English
- ISSN :
- 19326203
- Volume :
- 10
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- PLoS ONE
- Publication Type :
- Academic Journal
- Accession number :
- 108995627
- Full Text :
- https://doi.org/10.1371/journal.pone.0135160