Journal article
Wetting-drying cycles during a rice-wheat crop rotation rapidly (im)mobilize recalcitrant soil phosphorus
Journal of Soils and Sediments, Vol.20(11), pp.3921-3930
11/2020
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Abstract
Purpose The residual phosphorus (P) in Hedley’s sequential fractionation procedure is considered to be a relatively stable soil P pool and unavailable for plant uptake. In the present study, we investigated the effect of wetting-drying events on the dynamics of the residual soil P fraction in a flooded rice and aerobic wheat rotation.
Methods Soils were taken from a long-term field trial after flooded (rice), and aerobic (wheat) crops were harvested. Hedley’s sequential fractionation method was used to assess the distribution of various P fractions. These changes in these P fractions were then related to Fe cycling in the soil.
Results The residual P (H2SO4-H2O2 digested) was the dominant P fraction (37–51% of total P) in the aerobic soil under wheat, while it was decreased by 18–27% in flooded soil under rice cultivation. In contrast, the sparingly soluble Ca-bound P (HCl-Pi) increased from 25–31% under wheat cultivation to 41–50% under flooded rice (paddy) cultivation where reducing conditions are expected to prevail under submerged paddy soil conditions. The crop rotation not only altered the sparingly available P fraction but also influenced soil labile P, especially the organic P form. Compared with the rice soil, a 4-fold increase in the labile P fraction (NaHCO3-Po) was observed in wheat soil. The moderately labile P fraction (NaOH-extractable) showed a similar trend to that of labile P pool, but the increased NaOH-Po in wheat soil was relatively small. The relatively rapid change in the residual P fraction was attributed to oxidation-reduction cycles of Fe oxides between flooded (rice) and aerobic (wheat) soil conditions.
Conclusions Wetting and drying cycles associated with a rice-wheat crop rotation promoted the transformation of the sparingly soluble soil P fraction between crops, which was attributed to changes in soil redox conditions, particularly Fe cycling. This indicated that the rice-wheat crop rotation can draw upon the sparingly soluble P fraction for crop production, thus relying less on fertilizer-applied P.
Details
- Title
- Wetting-drying cycles during a rice-wheat crop rotation rapidly (im)mobilize recalcitrant soil phosphorus
- Creators
- Xiaoli Xu - Foshan UniversityXiali Mao - Zhejiang UniversityLukas Van Zwieten - NSW Department of Primary IndustriesNabeel Khan Niazi - University of Agriculture FaisalabadKouping Lu - Zhejiang A & F UniversityNanthi S Bolan - University of NewcastleHailong Wang - Foshan University
- Publication Details
- Journal of Soils and Sediments, Vol.20(11), pp.3921-3930
- Publisher
- Springer
- Grant note
- This study was supported by the National Natural Science Foundation of China (21876027) and the Special Fund for the Science and Technology Innovation Team of Foshan, China (1920001000083). We thank Zuxiang Xu for technical assistance.
- Identifiers
- 991012951199802368
- Copyright
- © Springer-Verlag GmbH Germany, part of Springer Nature 2020
- Academic Unit
- School of Environment, Science and Engineering; Science; Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article