p > 0.05, p < 0.05, and p < 0.01 indicate nonsignificant, significant, and highly significant differences, respectively.
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Background Values of Soil Heavy Metals in the Huang-Huai-Hai Plain in Henan Province, China.
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p > 0.05, p < 0.05, and p < 0.01 indicate nonsignificant, significant, and highly significant differences, respectively.