DISTRIBUTION AND AVAILABILITY OF CATIONIC MICRONUTRIENTS IN GROUNDNUT GROWN SANDY SOILS OF NELLORE DISTRICT
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Date
1993
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ANDHRA PRADESH AGRICULTURAL UNIVERSITY
Abstract
To study the soil characteristics that influence lhc
availability of micronutrients, a survey was undertaken in
groundnut grown sandy soils of Nellpre district of Andhra
Pradesh.
All the profiles varied from loamy sand to sandy clay in
texture, with an increasing pattern of clay content with
depth, slightly acidic to neutral in reaction, low in organic
carbon and CEC while base saturation
The Caco3 was less than one per
, exchangeable bases ex~ept K increased
was found to be more.
cent. The pH, CEC,
with depth whereas the
organic carbon showed a reverse trend.
saturation and ESP showed either an
The percent base
increasing or
inconsistent trend with depth.
Regarding fertility status of the soil profiles, the
available P and K content varied from low to medium with
higher content in surf ace layers. The P content decreased
with depth while the available K was slightly higher in
surface soils and uniformly distributed throughout the
profile. The exchangeable Ca and Mg and heat soluble S were
found to be low in surface soils which increased with depth.
The total content of micronutrients was found to be in
the o rder of Fe > MN > Zn > Cu while the available
micronutrients were found to be in the order Mn> Fe> Cu>
7n. The total concentration of micronutri.f!nts jncreaseci with
depth while the available mic ronuL rieuts showed a rcvc rsc
trend . The total concentration micronutrients was governed
by pH, and clay content in surface layers while in
i ntermediary and lower depths it was by p~, clay and CaC03 .
'"ht! ;1vallahlc mJcronutril,nts were lar,~t·ly dctcrmim•d by soil
organic carbon and pH in surface layers white in intermediary
layers by pH, organic carb-::.-n and clay and at the lower depths
by pH, clay and Caco3 . ·
The surface soils varied from loamy sand to sandy clay
loam in texture, slightly acidic to neutral in reaction. All
t 'nc.: soils were non-saline. The organic carbon was found to
be low. The surface soils of Gudur area maintained
comparatively higher levels of nutrient status than that of
the soils of Kavali and Nellore areas. The prevelance of
conspicuous Zn deficiency was observed in the soils of all
the three areas . The concentration of K, Ca, Mg and S were
significantly deficient in the index leaf of groundnut.
The total concentrations of Zn, Fe, Cu and Mn were
significantly and positively correlated with pH clay and
Caco3 and were non-signi[icantly correlated with organic
carbon. The available Zn, Fe , Cu and Mn showed a positive
and significant correlation with organic carbon. A
non-significant but negar~1re correlation was observed between
pH and avail able Zn, Fe and Mn while Cu showed positively
non-significant rel at ion with pH. The avai 1 able Cu showed
significant positive correlation with clay.
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