ADSORPTION DESORPTION OF ZINC, COPPER, IRON AND MANGANESE IN SOILS OF JUNNAR TAHSIL OF PUNE DISTRICT
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Date
24-06-05
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MAHATMA PHULE KRISHI VIDYAPEETH, RAHURI- 413 722, DIST. AHMEDNAGAR, MAHARASHTRA STATE (INDIA)
Abstract
Adsorption desorption behaviour of zinc, copper, iron and manganese in soils of Otur, Dholwad and Sivneri series, belonging to Vertisols, Inceptisols and Entisols , respectively collected from Junnar tahsil of Pune district were studied. The experiment was conducted at Division of Agricultural Chemistry and Soil Science, College of Agriculture, Pune, Maharashtra during the year 2004. The soils were clay to sandy clay loam in texture and were of alkaline nature with adequate organic carbon content. The soil sampies were incubated with solutions of graded concentration of Zn, Cu, Fe and Mn for a duration of seven days and the micronutrients released and retained after incubation were determined. The results showed that in al! the soils from three soil orders, the concentration of micronutrients increased with every increment of added solutions. The amounts of each micronutrient adsorbed on the soils were also estimated, which revealed that Vertisols had the greatest adsorption capacity followed by Inceptisols and the least affinity towards micronutrient adsorption was shown by Entisol soils. Based on the adsorption data, the Langmuir curve was plotted for each micronutrient and the Langmuir equation was also computed. It was observed that for all the four micronutrients i.e. Zn, Cu, Fe and Mn the adsorption maxima values were the highest for Vertisols and the lowest for Entisols with Inceptisols having an intermediary position. The bonding energy constant did not follow any definite pattern for different soils. The percent desorption for Cu, Fe and Mn in different soils followed the order: Inceptisols > Entisols > Vertisols; while, for Zn the maximum desorption was observed in Entisols, followed by Inceptisols and the lowest for the Vertisols.