STUDIES ON DISTRIBUTION OF CALCIUM, MAGNESIUM, SULPHUR AND BORON IN SOILS OF SELECTED AGROCLIMATIC ZONES OF KARNATAKA
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Date
19-08-11
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University of Agricultural Sciences GKVK, Bangalore
Abstract
Soil samples were collected from different locations of northern dry
zone, central dry zone, southern dry zone, southern transition zone and
coastal zone of Karnataka and were analyzed for available Ca, Mg, S and
B. Available Ca, Mg S and B of surface soil ranged from 825 to 1811 mg
kg-1, 232 to 340 mg kg-1, 6.39 to 15.22 mg kg-1and 0.328 to 0.631 mg
kg-1 in soils of different agro-climatic zones. Available Ca and Mg were
highest in soils of northern dry zone and lowest in soils of coastal zone.
Available S and B were highest in soils of coastal zone. Available S was
lowest in soils of southern dry zone and available was lowest in soil of
central dry zone. Available Ca was relatively higher, while available Mg,
S and B were relatively lower in the deeper layer of soil as compared to
surface layer of soils. Total Ca, Mg and S were much higher in the soils
of dry zones as compared to the soils of transition and coastal zone.
Coastal zone soils had higher proportion of organic S than soils of the
central dry zone and southern transition zone. The four forms of boron
together accounted for only 1-2 per cent of total boron in soils of all the
five zones. Organic bound boron was relatively higher than those of
specifically adsorbed boron and oxide bound boron in soils of most of the
zones. Clay and CEC of soil were relatively higher in soils of dry zones as
compared to that of coastal zone.