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Crop concentration means the variation in the density of any crop in a region at a given point of time. The concentration of crops in an area largely depends on its terrain, climate, and soils and agricultural practices of the farmers. Each crop has a maximum, minimum and optimal temperature. The crops have a tendency to have high concentration in the areas of ideal agro-climatic conditions and the density declines as the geographical conditions become less conducive. It is because of these factors that rice has high concentration in east Indian states, wheat in Punjab and Haryana, cotton in black earth region, and Bajra in Rajasthan (Fig. 10.1).
A number of statistical techniques have been used by agricultural geographers for the demarcation of crop concentration regions. The location quotient method is, however, more reliable as it gives a reliable picture of the relative density of crops.