STUDY OF DIFFERENT FORMS OF ZINC AND IRON AND THEIR RELATION WITH OTHER PROPERTIES OF SOILS UNDER RICE BASED CROPPING SYSTEM IN CHAMARAJANAGAR DISTRICT
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Date
2009-07-10
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
An investigation was under taken to study the available zinc and
iron status and distribution of different forms of zinc and iron in soils
under paddy land use in Chamarajanagar district. Seventy five surface
soil samples were collected from fifteen villages belonging to
Chamarajanagar, Yelandur and Kollegal taluks of Chamarajanagar
district. These samples were analyzed for available zinc and iron status
and different forms of zinc and iron. The results revealed that available
zinc and iron ranged from 0.69 to 2.96 and 6.09 to 32.14 mg kg-1,
respectively. Distribution of different forms of zinc viz., water soluble,
sorbed, easily reducible manganese bound, carbonate bound, organic
matter bound and iron and aluminium oxides bound zinc ranged from
0.02 to 0.18, 0.64 to 5.31, 0.21 to 1.87, 0.11 to 3.39, 0.02 to 1.48 and
1.82 to11.68 mg kg-1 respectively and distribution of different forms of
iron viz., exchangeable iron, organic matter bound, manganese oxides
bound, amorphous iron oxides and crystalline iron oxides iron in these
soils ranged from 2.68 to 12.12, 1.02 to 1.97, 14.7 to 92.3, 178 to 1020
and 167 to 1046 mg kg-1, respectively. Correlation studies indicated that
available zinc recorded a significant and negative correlation with clay
(r=-0.24*) and available iron recorded a significant and positive
correlation with CaCO3 (r=0.54**) and negatively with pH of the soils (r=-
0.50**). All the zinc and iron fractions were correlated positively with
each other except the easily reducible manganese bound zinc and
organic matter bound iron, which recorded negative correlation with
other fractions indicating the existence of a dynamic equilibrium
between the zinc and iron fractions.
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