The contents of trace elements in soils of Henan Province are lower than the average values in soils of China. Owing to diverse parent materials and soil types, the contents of trace elements in the soil fluctuate greatly. The soils are mostly deficient in available B and available Mo. However, the Zn content which belon ges to lower level as compared with other regions varies with different parent materials and soil foaming conditions.The distribution of trace elements in profile varies with elements and soil types, soil pH value is the most important factors affeecting the available availability of trace elements in soil. Available Zn and NIn contents in soil decreases with the increase of pH value, while Mo trends in the contrary way.
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贺家媛,郑文麒,邓留珍.河南省土壤微量元素含量分布及在农业上的应用[J].土壤学报,1986,23(2):132-141. He Jiayuan, Zheng Wenqi, Deng Liuzhen. DESTRIBUTION AND FERTILIZER EFFICIENCY OF THE TRACE ELEMENTS IN SOILS OF HENAN[J]. Acta Pedologica Sinica,1986,23(2):132-141.