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Polymer-coated manganese fertilizer and its combination with lime reduces cadmium accumulation in brown rice (Oryza sativa L.).
- Source :
-
Journal of Hazardous Materials . Aug2021, Vol. 415, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- Manganese (Mn) has the potential to reduce cadmium (Cd) uptake by rice; however, the efficiency depends on its soil availability. Therefore, this study designed a slow-release Mn fertilizer by employing a polyacrylate coating. Pot trials were conducted to study the effects of coated-Mn and uncoated-Mn alone or in combination with lime on the dynamics of soil dissolved-Mn and available Cd, and the transportation of Mn and Cd within rice. The results showed that coated-Mn declined the release of Mn until the 7th day of application; however, it consistently supplied more dissolved-Mn than uncoated-Mn. As a result, coated-Mn induced a greater Cd reduction (45.8%) in brown rice than uncoated-Mn (9.7%). The total Cd of rice and its proportion in brown rice were greatly reduced by coated-Mn, indicating the inhibition of root uptake and interior transport of Cd. Additionally, lime addition prominently increased the soil pH and decreased the CaCl 2 -extractable Cd (90.1–93.9%). However, since lime reduced the soil dissolved-Mn, downregulated the OsHMA3 expression and upregulated the OsNramp5 expression, brown rice Cd was reduced by only 43.0%. The combined addition of lime and coated-Mn alleviated the liming effect on soil Mn and gene expression in roots, thereby reducing brown rice Cd by 71.5%. [Display omitted] • Polymer coated-Mn (CMn) constantly supplied dissolved-Mn during rice growth period. • CMn also improved Mn accumulation in rice tissues, while reduced Cd in brown rice. • CMn along with lime was more effective to reduce Cd in whole plant and brown rice. • CMn alleviated the liming effects on soil available Mn and Cd-related transporters. [ABSTRACT FROM AUTHOR]
- Subjects :
- *BROWN rice
*RICE
*LIMING of soils
*CADMIUM
*SOIL dynamics
*FERTILIZERS
*MANGANESE
Subjects
Details
- Language :
- English
- ISSN :
- 03043894
- Volume :
- 415
- Database :
- Academic Search Index
- Journal :
- Journal of Hazardous Materials
- Publication Type :
- Academic Journal
- Accession number :
- 150574263
- Full Text :
- https://doi.org/10.1016/j.jhazmat.2021.125597