Distributing of Iron And Manganese in Some Cultivated And Forest soils of Ranchi District
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Date
1998
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Birsa Agricultural University, Ranchi
Abstract
Two soil Profiles; one in cultivated area and another in forest area of Ranchi district were studied. Besides this, some surface soil samples from adjacent areas of each profile and soil samples from two depths viz. 0-20 and 20-40 cms of N, NP, NPK, FYM, L+NPK and control plots of Permanent Manurial Trial were also taken to study the distribution of iron and manganese in the soils.
In the profile of forest area, colour was strong brown to dark reddish brown, texture, sandy loam to sandy clay loam and structure was weak medium angular to strong angular blocky. In the profile of cultivated area, colour was yellowish brown to yellowish red, texture sandy clay loam to sandy loam and structure was moderate medium subangular blocky to angular blocky. Mottling s and concretions were also found in the profile.
The results of present investigation indicated that in both the profiles there was increasing trend of clay, C:N ratio, pH, CEC, exchangeable bases. base saturation, active and total iron, reducible, active and total manganese, whereas organic carbon, total N, exchange acidity, available iron and manganese showed a decreasing trend down the profile. It was also observed that the values of silt, clay, organic carbon total nitrogen, soil acidity, exchangeable bases, and all forms of iron and manganese were higher in the profile of cultivated area than the profile of forest area. In the surface soils the organic carbon, total N. available forms of iron and manganese were slightly higher in the soils of cultivated area than the forest area whereas total and active iron, and manganese had reverse trend.
In the soils of Permanent Manurial Trial plots, the long term effect of cropping and fertilizers use is very clearly expressed on various soil properties. The clay content, organic carbon, CEC, exchangeable bases and pH were highest in FYM plots followed by Lime+NPK plot, indicating the favourable effects of balanced nutrition on various soil properties whereas nitrogenous fertilizer deteriorated the soil properties. Continuous application of chemical fertilizers and FYM increased all the forms of iron over control but liming did not do so. The available forms of iron were more in upper layer than the subsoil whereas active and total iron contents had a reverse trend. Continuous application of N. NP and NPK fertilizers resulted in the depletion of all forms of manganese whereas FYM alone and liming along with fertilizers maintained the status of all the forms of manganese. All forms of manganese were more in the subsoil than surface soil in the treatments of N, NP, NPK, and L+NPK, whereas FYM and control had a reverse trend only in case of available forms of manganese.
Correlation study indicated that the available forms of iron and manganese in soil were positively and significantly correlated with exchange acidity and organic carbon content but negatively and significantly correlated with soil pH. Total and active iron, and manganese in soil had a positive and significant relationship with clay, silt+clay, CEC and exch. Ca++ in the surface soils whereas a negative and significant relationship was found with exchange acidity.