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Cadmium Uptake by Ryegrass and Ryegrass--Clover Mixtures under Different Liming Rates.
- Source :
- Journal of Environmental Quality; Sep/Oct2018, Vol. 47 Issue 5, p1249-1257, 9p
- Publication Year :
- 2018
-
Abstract
- Cadmium accumulates in soils that receive repeated applications of Cd-rich superphosphate fertilizers. There is evidence that adding clovers to a crop solubilizes soil Cd, increasing the bioavailability of Cd. This can lead to high plant Cd concentrations. This research aimed to test whether liming-induced increases in pH in mixed crops of clovers and ryegrasses reduced forage Cd concentrations. A greenhouse pot trial applied lime at three rates (0, 1, and 2% of soil dry weight) to eight different plant treatments--four as monocultures (perennial ryegrass [Lolium perenne L.], Italian ryegrass [L. multiflorum Lam.], white clover [Trifolium repens L.], and red clover [T. pratense L.]) and four as ryegrass--clover mixtures (two plant types in each treatment)--in soil (initial soil pH = 5.1, initial soil Cd concentration = 1.31 mg kg<superscript>-1</superscript>) with added Cd (CdSO<subscript>4</subscript> ~ 1 mg kg<superscript>-1</superscript>). Adding lime increased soil pH in both mono- and mixed crops and, in most treatments, increased forage yields. However, the relationship between forage Cd and soil pH differed between plant treatments. In mono- and mixed crop treatments containing perennial ryegrass, adding lime increased the forage yield but did not increase the mass of Cd in the plants compared with the no-lime treatment. However, adding lime to treatments that included Italian ryegrass increased both the forage yield and the Cd compared with the no-lime treatment. The results show that a combination of certain plant species composition and lime rates can optimize forage yields without increasing forage Cd concentrations. [ABSTRACT FROM AUTHOR]
- Subjects :
- RYEGRASSES
CADMIUM
LIMING of soils
Subjects
Details
- Language :
- English
- ISSN :
- 00472425
- Volume :
- 47
- Issue :
- 5
- Database :
- Supplemental Index
- Journal :
- Journal of Environmental Quality
- Publication Type :
- Academic Journal
- Accession number :
- 131899055
- Full Text :
- https://doi.org/10.2134/jeq2018.01.0015