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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