The soil Cd pollution has become one of the most important environmental problems [1]. Due to a series of activities of humans, including irrigation of farmland sewage and industrial wastes, the contents of heavy metals in the soil increased [2][3][4]. Cadmium in soil could be absorbed by plants, which affects plant growth and physiological metabolism and reduces the yield and quality of crops [5,6] . Plants reduce the toxic effects of heavy metals by altering their own structure
Let q be a prime greater than 4. In this paper, we determine the coefficients of the discrete Fourier transform over the finite field Fq of two classes of quaternary sequences of even length with optimal autocorrelation. They are quaternary sequence with period 2p derived from binary Legendre sequences and quaternary sequence with period 2p(p + 2) derived from twinprime sequences pair. As applications, the linear complexities over the finite field Fq of both of the quaternary sequences are determined.
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