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Chemical speciation of Zn in acidic soils: suitable soil extractant for assessing Zn availability to maize (Zea mays L.)

Posted on 13. November, 2014.

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Zinc is an essential micronutrient for plants, animals and humans. Being a structural constituent or a regulatory co-factor, it influences the activities of several key enzymes involved in important biochemical processes.Crop plants obtain their necessary Zn from soil.

The availability of soil Zn to crop plants is governed by soil properties which, in turn, also influence the dominance of different chemical fractions of Zn in the soils. Different chemical fractions of Zn in soil are likely to vary considerably in their intensities, chemical reactivity and bioavailability.

Since the degree of metal association with different chemical fractions strongly depends upon the physico-chemical conditions of the soil, the chemical speciation of Zn in soils provides useful 
information on its mobility and availability.

As regards the suitability of different soil extractants for assessing the bioavailability of Zn, several studies have been carried out in respect of neutral, calcareous and alkaline soils. However, little information is available on the chemical speciation of Zn and the suitability of different soil extractants for the assessment of Zn availability, especially, in acidic soils of India. 

The authors present this investigation which was undertaken to examine chemical speciation of Zn in acidic soils and to evaluate the suitability of different soil extractants for assessing bioavailability of Zn in these soils.

Read the full article in Chemical Speciation and Bioavailability, Volume 26, Number 3, August 2014, pp. 148-157.

Authors: Dibya Joshi, Prakash Chandra Srivastava*, Rama Dwivedi and Satya Pratap Pachauri

Department of Soil Science, Govind Ballabh Pant University of Agriculture & Technology, Pantnagar-263145, Uttarakhand, India


Keywords: chemical fractions, maize, soil extractants, zinc uptake


DOI:10.3184/095422914X14035354272035

Image: General map showing the sampling area. Solid circles indicate the sampling points in Uttarakhand and Uttar Pradesh.