Author : Divya J and Belagali S.L.

The physico-chemical characteristics of the agricultural fields from Nanjangud near Mysore were analyzed to study the seasonal variations in agro ecosystems. Soil characteristics showed a high pattern of variability in some of the soil constituents. Seasonal variations of main soil chemical characteristics were studied in some representative sampling sites from agricultural lands of Najangud taluk. The soil samples were collected during rainy, winter and summer seasons from 15 different agricultural lands and were analyzed for different physico–chemical characteristics. From the study, it was concluded that, the application of chemical fertilizers has greater influence on soil quality. In all the soil samples, during all the seasons, urea and DAP residues were detected. The highest concentration was recorded during Rainy season followed by winter season. In case of cations and anions, concentrations were found to be higher during monsoon, post-monsoon, followed by summer seasons, which indicates that, the amount of fertilizers applied was not completely taken up by the crops. As the study area is having good irrigation facilities, throughout the year, the nitrate and phosphate entry into water resources through surface run-off and leaching was expected to be more.

Keywords: Seasons, Soil properties, Acidic Soil, Chemical fertilizers

Article published in International Journal of Current  Engineering  and Technology, Vol.4,No.4 (Aug- 2014)