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Applied and Environmental Soil Science
Volume 2015, Article ID 756270, 6 pages
http://dx.doi.org/10.1155/2015/756270
Research Article

Cadmium Phytoremediation Potential of Napiergrass Cultivated in Kyushu, Japan

1Department of Animal and Grassland Sciences, Faculty of Agriculture, University of Miyazaki, Miyazaki, Miyazaki Prefecture 889-2192, Japan
2Graduate School of Agriculture, University of Miyazaki, Miyazaki, Miyazaki Prefecture 889-2192, Japan
3Teaching and Research Center for Bio-Coexistence, Hirosaki University, Goshogawara, Aomori 037-0202, Japan

Received 29 October 2015; Accepted 16 December 2015

Academic Editor: Ezio Ranieri

Copyright © 2015 Yasuyuki Ishii et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Napiergrass (Pennisetum purpureum Schumach), a C4 tropical species, has been used for forage since it has high dry matter productivity, sustainability over several years in low-altitudinal sites of Kyushu, and little damage from serious pests. Recently, this grass has gained attention due to its potential as a bioethanol feedstock and for phytoremediation. Napiergrass cultivar Wruk Wona was grown as an annual crop in cadmium- (Cd-) contaminated soils under two cutting frequencies. Annual dry matter yield was not affected significantly by cutting frequency, but the concentration and uptake of Cd were higher when cut twice rather than only once, due to high Cd content of the herbage from the second cutting. Therefore, the soil Cd concentration was reduced by 4.6% when managed by cutting twice in a single year of Napiergrass cultivation.