The State which had been divided into eight agro-climatic regions has been now redrawn into ten agro-climatic zones based on a more refined set of criteria. The National Commission on Agriculture had put the country into 62 rainfall patterns, Karnataka having 14 of them. But, rainfall alone does not account for the entire crop production situation. The State in an exercise between the Department of Agriculture and the University of Agricultural Sciences came up with 10 agro climatic zones.
The criteria taken into account in defining agro-climatic zones are: (a) Rainfall pattern-quantum and distribution, (b) Soil types, texture,depth and physico-chemical properties, (c) elevation and topography and (d) major crops and vegetation.
In the past, agro climatic zones had been defined which cut across taluks. But the present system of delineating the State into 10 climatic regions taking taluka as an administrative unit for research and development, as far as possible. Taluk boundaries are kept intact in re-drawing agro-climatic zones.
Description of each zone
Details of Agricultural zones