Effect of Fertilizers on Cd Uptake of Amaranthus hypochondriacus, a High Biomass, Fast Growing and Easily Cultivated Potential Cd Hyperaccumulator
2012
Li, Ning Yu | Fu, Qing Lin | Zhuang, Ping | Guo, Bing | Zou, Bi | Li, Zhi'an
In a greenhouse pot experiment, we assessed the phytoextraction potential for Cd of three amaranth cultivars (Amaranthus hypochondriacus L. Cvs. K112, R104, and K472) and the effect of application of N, NP, and NPK fertilizer on Cd uptake of the three cultivars from soil contaminated with 5 mg kg⁻¹ Cd. All three amaranth cultivars had high levels of Cd concentration in their tissues, which ranged from 95.1 to 179.1 mg kg⁻¹ in leaves, 58.9 to 95.4 mg kg⁻¹ in stems, and 62.4 to 107.2 mg kg⁻¹ in roots, resulting in average bioaccumulation factors ranging from 17.7 to 29.7. Application of N, NP, or NPK fertilizers usually increased Cd content in leaves but decreased Cd content in stem and root. Fertilizers of N or NP combined did not substantially increase dry biomass of the 3 cultivars, leading to a limited increment of Cd accumulation. NPK fertilizer greatly increased dry biomass, by a factor of 2.7–3.8, resulting in a large increment of Cd accumulation. Amaranth cultivars (K112, R104, and K472) have great potential in phytoextraction of Cd contaminated soil. They have the merits of high Cd content in tissues, high biomass, easy cultivation and little effect on Cd uptake by fertilization.
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